DPI 740 User Manual M-2912 · DPI 740 Precision Pressure Indicator User Manual M-2912 @ Omege...

DPI 740

Precision Pressure Indicator

User Manual

M-2912

@ Omege Engineering, Inc.

This document is the property of Omega Engineering, Inc and maynot, either in partorwhole, be copied or otherwise reproduced, communicated in any way to thirdparties, nor stored in any Data Processing System, without the express written

authority of Omega Engineering, Inc

M-2912 Issue No.1

N~nI3~

$e'l# INI~d

(OL)$~HJ=$q lllNn dOOl

$q+$e=$e

(L#'L)$lndNI=$q

.uo!~e:J!}!:Jeds ~:JnpoJde4~ U! pUno} eq Aew spJepue~s pe!ldde }0 Sl!e~ep ~

) Je41Jn:l .sell!~:)eJ!p J33 ~UelleleJ e4~ }0 s~ueweJ!nbeJ ~

UO!~:Je~oJd le!~UeSSe e4~ s~eew ~:JnpoJd S!41

oa...=$e:Aldetj~e~

aN3Z#3S01:)l#3S01:)

Aldetj~e~ 8nSO~.(0 l)$tjH:)+(� l)$tjHJ + .In!#. .Z# lNltjd

.(�l)$!:1HJ + .In!#. .l# lNl!:1d:(0 l)$!:1H:)+(� l)$!:1H:) + .o=e~. + .66. + $sseJppe + .#. 'Z# lNl!:1d

.(�l)$!:1HJ + .0=e~.+.66. + $sseJppe + .#. .l# lNl!:1d

:(�l)$!:1HJ+.6HU!.=$eJnsseJd+. S! Aea e4~ ~o eJnSseJd.1NI!:1d(8 .$eJnsseJd)$l::131 =$eJnsseJd

(Ol.$e)$lH~I!:1=$eJnsseJdAlde!:1~e~ 8nSO~

.(0 l)$!:1HJ+(� l)$!:1H:) + .lJd. + .66. + $sseJppe + .#. 'Z# lNl!:1d:(�l)$tjHJ + .Vd"+.66" + $sseJppe + .#. .l# lNl!:1d

:(Ol)$!:1H:)+(�l)$tjH:) + .8l=n!.+.66. + $sseJppe + .#. 'Z# lNl!:1d:(�l)$!:1HJ + .8l=n!.+.66. + $sseJppe + .#. .l# lNl!:1d

Alde!:1~e~ 8nSO~'(Ol)$!:1HJ+(�l)$!:1HJ + .V!.+.66. + $sseJppe + .#. 'Z# lNl!:1d

.(�l)$tjH:) + .V!.+"66. + $sseJppe+ .#. .l#lNI!:1d

:(�l)$!:1H:)+.!sd.=$eJnsseJd+. S! Aea e4~ ~o eJnSSeJd.1NI!:1d

(8.$eJ nsseJd)$l::131 =$eJnsseJd(0 l.$e)$lH~I!:1=$eJnsseJd

Aldetj~e~ 8nSO~.(Ol)$tjHJ+(�l)$tjHJ + .Vd.+.66. + $sseJppe + .#. 'Z# lNltjd

:(�l)$!:1H:) + .Vd"+.66" + $sseJppe + .#. .l# lNl!:1d:(Ol)$!:1H:)+(�l)$!:1HJ + .9l=n!.+.66. + $sseJppe + .#. 'Z# lNl!:1d

:(�l)$!:1HJ + .9l=n!.+.66. + $sseJppe + .#. .l# lNl!:1d:(Ol)$tjHJ+(�l)$tjHJ + .(l.Ol.J!)-=:Jd"+"66. + $sseJppe + .#. 'Z# lNltjd

:(£l)$~H:) + .(l.Ol.J!)-=:Jd.+.66. + $sseJppe + .#. .l# lNI~d

:(Ol)$!:1H:)+(�l)$~H:) + .d=:J!.+.66. + $sseJppe + .#. 'Z# lNI~d:(�l)$!:1H:) + .d=:J!.+.66. + $sseJppe + .#. .l# lNl!:1d

:(Ol)$!:1H:)+ (�L)$tjHJ + .l=e!#. 'Z# lNltjd

:(�l)$!:1H:) +.l=e~#. .l#lNI!:1d

.~UeLUnJ~SU! S!4~ Uo eSJno:J 5u!u!en e4~ pe~eldLUO:J"lln~SSe:J:Jns

pue ~ue5e pe~u!odde JO JeJn~:Je~nUeLU e4~ "q ue/\!5 eSJno:J

5u!u!eJ~ ~:JnpoJd e pepue..e e/\e4 ~SnLU uosJed pe!~!lenb V

.lenUeLU S!4~ ~o JeeJ e4~ ~e ~S!I e4~ o~ Je~eJ AJe!P!sqnsJO ~ue5e ' JeJn~:Je~nUeLU e4~ ~:Je~UO:J e:J!/\pe le:J!u4:Je~ J°:J

8~!Apy 18~!uLl~e.L

.s~ueLU~Jedep e:J!/\JeS S,JeJn~:Je~nUeLU e4~ JO s~ue5e

e:J!"Jes peZ!J04~ne "q ~no pe!JJe:J eq Pln04s pue SeJnpe:JOJd

s,JeJn~:Je~nuew e4~ 5u!sn peu!e~u!ew eq ~snw ~uewnJ~su! e41

e~U8Ue/U!8W

.~uewnJ~su! S!4~ U! pesn sle!Je~ew :J!XO~ UMOU)j oU eJe eJe41

SI8!..e/8W ~!X°.L

.~uewnJ~su! e4~ O~ eJnsseJd

5U!)jJOM a~es wnw!xew e4~ ue4~Je~eeJ5 eJnsseJd "Idde ~OU oa

e..nsse..d

.uo!~e:J!lqnd S!4~ U! SaJnpe:JOJd lIe JO~a:J!~:JeJd 5u!Jaeu!5ue p005 pue laUUOSJad *pe!~!lenb esn o

.e5ewep JO AJnrU! WOJ~ ~uewd!nbe e4~ pue

Jesn e4~ 1:Je~oJd 01 penSS! SUO!1ne:J JO S5U!UJeM Je41!e eJe

SUO!1:>nJ1SU! "~e~es e41 .UO!1!PUO:> e~es e U! 1uewnJ1SU! e4~

u!e~u!ew 01 pue Uo!~eJedo 8~eS JO~ peMO110~ eq 1SnW ~e41SUO!~:>nJ~SU! "~e~es pue 5u!~eJedo SU!e~UO:> Uo!~e:>!lqnd S!41 o

.pe~e1s ~e4~ ue4~

esodJndJe4~0"UeJO~1ueWnJ1SU! S!41eSn10U oa .Ienuew

S!41 U! pel!e1ep SeJnpe:>oJd e41 5u!sn pe~eJedo Ue4M e~es

eq 01 1uewnJ1SU! S!41 peu5!sep se4 JeJm:>e~nuew e4l

A~ej8S

lenuew JaSn 017L Ida

~lenuew .lasn 017L Ida £9

62 DPI 740 User M,8nual ii DPI 740 User Manual

Table 6-3

Example Program in QBASICBattery Safety

This instrument is fitted with three size AA batteries either

rechargeable (nickel cadmium) or non-rechargeable

(alkaline).

Before storing this instrument remove the batteries

When fitting batteries make sure the electrical contacts are

clean and observe the correct polarity.

The battery compartment should be inspected for

corrosion caused by leaking batteries. Corrosion must beremoved using approved methods*.

When storing and transporting batteries make sure that

they cannot be short circuited. A short circuited battery

can become very hot and can, in certain circumstances,

explode. It is recommended that a suitable container is

used for storing and transporting batteries.

Dispose of old batteries using a safe, approved method.*

*Refer to the Battery Manufacturer for this information.

Software Version

This manual contains operating instructions for instruments

with software version 1.XX. Further changes to the

instrument's software may require a change to the operatinginstructions and an issue number change of the manual.

start:

EOFch=26

CLS

port%=1PRINT SPC(20); 'DPI 740 Omega Universal Communi(;ations

Interface: Example Program' PRINT SPC (19);

PRINTPRINT Before commencing, ensure that the DPI 740Communications Parameters are set as follows"'PRINTPRINT 'Baudrate : 9600, Parity" None, Handshaking" None,Databits " 8, Stop bits " l'

PRINTPRINT 'The PC serial comms port used is COM";PRINT port%PRINTPRINT 'Please note DOS File Name" Pressure Readings will beLogged in this File'PRINTINPUT Nm$PRINT

PRINT'Ready'PRINT" Press <CTRL><BREAK> to exit'PRINT 'Starting communications'OPEN Nm$ FOR OUTPUT AS #2IF port% = 2 THEN

OPEN 'COM2"9600,N,8,1,RS,RB6000. FOR RANDOM AS #1ELSE

OPEN 'COM2"9600,N,8, 1,RS,RB6000' FOR RANDOM AS #1END IFPRINT "Comm port opened OK'

a$="PRINT#1, "#sa?" + CHR$(13);PRINT #2, '#sa?' + CHR$(13) + CHR$(10);

GOSUB GetReply

address$=RIGHT$(a$,4)address$= LEFT$(address$,2)

M-2912 Issue No.1

l "ON enssl ~l6~-LI\J

le:Jsed edJe~ewe!p ep!S~no p/o

Wn!Wpe:J le>l:Jlu peJ !N

~IO"!II!W I\wle:Jsed e5ew ed~

AJn:JJew fO Je~eW 5HWAJn:JJew fO Je~ew!ll!w 5HWW

Je~ew!II!W wwe~nlOsqe Jeq!II!W e Jeqw

Jeq!ll!w Jeqw

eJedw'1 !11!W '1w

Aelds!p le~sAJ:J P!nb!1 aJl~OOf eJenbs Jed e:JJOf punod ,~f/fql

le:Jsed 01!>1 ed>lJe~ew eJenbs Jed e:JJOf WeJ501!>1 ,W/f5>1

Je~ew!~ue:J eJenbs Jed e:JJOf WeJ501!>1 ,W:J/f5>1

WeJ501!>1 5>1eJe4dsoW~e pJepUe~S leUO!~eUJe~UI '1S1

Je~eM fO 4:JU! O'HU!AJn:JJew fO 4:JU! 5HU!

Je~ewe!p ep!su! p/!Uo!~es!ue5JO Uo!~e!,,'1I!"!J leUO!~eUJe~UI O'1JI

z~JeH zHle:Jsed 0~:Je4 ed4

ele:Js-llnf S:JJe~eM fO ~eef O'H~f

e:JefJe~ul Uo!~e:J!UnWWOJ lesJe,,!Un >I:JnJa IJna

~uewd!nbe leu!wJe~ e~ep 31a

~uewd!nbe 5u!~eu!wJe~ ~!n:JJ!:J e~ep 3Ja

~ueJJn:J ~:JeJ!p Ja

pues o~ Jeel:J SIJAJn:JJew fO Je~eW!~ue:J 5HW:J

pJepue~s 4S!~!J8 S8

eJe4dsoW~e w~eeueJA~s eue!pe~nq el!J~!UOIAJ:Je S8'1

.leJnld pue jeln6u!s a41 U! awes a41 aJe SUO!le!AaJqqV' :e~oN

.Ienuew S!4~ U! pesn eJe SUo!~e!"eJqqe 5U!M0110f e41

suoIJelA9.1qqy

~ee~SJe~ew

(:!009) '090'HU!

(JoV) 'V00'H~~

(Jo0Z) 'OZ0lH~~

(JoV) 'v00'HU!

(Jo0Z) 'OZ0'HU!

5HU!

l~~/~ql

!sdw~e

JJO~

O'Hw

O'HW:>

O'HwW

5HW

5HW:>

5HwW

,w/~5)j

lw:>/~5)j

edlt'.J

ed)j

ed4

ed

Jeq

Jeqw

lLOL

-�l-ll-Ll-Ol-6L-8L-LL-9L-9L-vL-�L-lL-L L-OL-6-8-L-9-9-v-�-l-L-a

'SpUBWWO:J ns pUB nl 84~ Aq p8Sn 8JB pUB Mol8q P8U!~8P8JB ~U8W8JnSB8W ~O S~!Un 84~ IIB Af!~U8P! o~ p8Sn <X8pu!> 841

S~!Un ~U8W8.1nSeaw JO 8lqe.L

z-g 8lqe.L

1.9lenuew J9Sn O~L Ida!!!lenuew ..asn 017£ Ida

60 DPI 740 User Manual iv DPI 740 User Manual

Abbreviations continuedTable 6-1

Table of Error Definitions

The 16-bit hexadecimal mask defined below can be specified

using the AE command. It is used for automatic error

reporting by the RE message transmitted by the instrument.

PCB

ppm

psiOFE

OFFBit Error

0 syntax error

parameter errorONH

RPT

RTS

RS232

Rx

Tx

V

VA

oC

of

configurationerror

printed circuit board

parts per million

pound per square inch

barometric pressure at airfield level (local)

calculated sea level pressure including air

temperaturecalculated sea level pressure

resonant pressure transducer

ready to send

Serial data communication standard

receive

transmit

Volt

Volt amp

degrees Celsius

degrees Fahrenheit

address error

checksumerror

Symbols

calibrationerror

sequence error

The following symbols are used to identify hazards on

this instrument.

Description

Set if the command syntax was not understood

Set if the parameters in the command were out ofrange or not valid

The configuration parameters can only be changedif the configuration PI N is sent with the commandsIf the PIN is not sent or is incorrect this error is

reported

An invalid address packet was received

The received command checksum did not matchwith the calculated checksum With this error,the command is not executed and this error

reported

An error occurred while trying to zero a measurand,

probably because the zero offset is too large

Error in the instrument's calibration procedure;not enough calibration points

A valid command was received, but can not be

processed because the instrument was not in thecorrect state to execute command

This command was not available on thisinstrumenc

Reading outside range

Static sensitive components handle with

extreme care.8 command notavailable

9 range error

10 reserved

11 reserved

12 reserved

13 reserved

14 reserved

15 reserved

&This symbol, on the instrument, indicates

that the user should refer to the user

manual.

M-2912 Issue No.1 M-2912 Issue No.1

l "ON anssl ll6l-~

LE

LE

LE

LE

Bu!UeelJ £.g.Bu!pu!! ~lne:J z.g

leJeue':) l.9e:>ueue~u!el/lJ 9

££££

>I:J6ljJ UO!~eJq!leJUO!~eJq!leJv

Jd JO Je1.u!Jd e 01. S1.ueWeJnSeel/lJ 5u!pues

Nld MeU e 5u!Je1.U3

SUO!1.e:JIUnWWOJ le!Jes

1.no-ew!l

S1.! U n

AJe1.1.e8

nuel/lJ dn-1.es £.£

u!l/IJ/xel/lJ

Je1.I!::1

eJ e 1

s1.ueweJnseel/lJ 5U!SSe:JOJd

1.ueWeJnSeel/lJ epm!1.I'v'

1.UeWeJnSeelAJ (::1::10) leAel ees

1.ueweJnseel/lJ (3::10) le:J°1

sepol/lJ 1.UeweJnSeel/lJ l.£

I eJ e U e ~ l .£

uo!1.eJedo £

Z£

~£

6Z

8Z

gz

gz

gz

~Z

8~

8~

8~

g~

v~

£~

~ ~

~ ~

~ ~

(apOW a~OWaJ U! 5u!~eJado) ~=V.J)iJO

(apow le:J°I U! 5u!~eJado) 1=V.J)i :Alda~

apow 5u!~eJado AJanb lV.J)i

s5u!~~es le!~!ul £.~

suo!~:Jeuuo:) le:J!J~:JeI3 ~.~

AJe~~e8 L .~

uo!~elle~sul ~

OL

9

9

9

suo!~dO pUB Se!JOSse:>:>\f ~. L

uO!~e:J!l!:>eds L. L

uo!~:>npoJ~ui L

el~!~

17 ...

Z ...

~ ...

e6ed

.sme~sa~OWaJ/le:JOI a4~ SUJn~aJ puewwo:J AJanb a41 .AJano

(pe/q6'SIP suOJJnq-l/snd)epoW eJOWeJ;; = W)/

(pe/q6'Ue SUOJJnq-l/snd)epoW /6'.?0/7 = W)/ :e/dw6'X3

.suo~~nq-4snd a4~ s'l:JoiUn/s'l:J°I puewwo:JS!41 .Ala~OWaJ pa~eJado aq ue:J ~uawru~su!a4~ ~e4~ os apow uo~~nq-4snd a4~ s~as :uo!~d!J:Jsaa

<5el~>=~)! :~ewJo:fapow 6u!~e.lado a~OWa.l/IB:JO' -W>I :pUBWWO:)

spuewwo:J Aa>lSJU9JUO:> 10 9lqe.l6~lenuew ..asn Oto£ IdaAlenuew .lasn 011£ Ida

58 DPI 740 User Manual vi DPI 740 User Manual

page

...39

...39

...40

...42

...44

...44

...46

...49

...50

...54

...55

...57

...58

Protocol format commands

Command: FC -Enable/disable message

checksumFormat: FC=<fiag>

Description: Format checksum command. Enables/

disables the checksum feature of the data

transactions.<flag> = O disable checksum feature

1 enable checksum feature

Examp/e: FC = O disab/e checksum feature

FC = 1 enable checksum feature

Query. There is no corresponding query command.

Command: FA -Enable/disable addressed

modeFormat FA=<fiag>

Description. Format addressing mode command.

Enables/disables the addressed modefeature of the data transactions. When

addressed mode is disabled. one to one

communication (direct mode) is assumed.<flag> = O disable addressed mode

1 enable addressed modeExamp/e: FA = O disab/e addressed mode

FA = 1 enable addressed mode

Query: There is no corresponding query command.

Table of Contents (contd)

title

6 Communications ..." " , "' , "'.."

6.1 Introduction , "'..." ,.,..." " "..."".."

6,2 General Command Format .." , " "'.

6,3 Command Summary "' "..."' ,,...""..""

6.4 Command Set "...""..""..."' ' " "' '

Input Commands ""..."' "' , " " ,.

Process Commands , ", " " , , Set-up Commands ."...""..."' " " " '

Calibration ComrtJands .." " " " "..

Automatic Commands , " "'..." "..."..

Read Commands ..."'..."".."' "'..."'..." '

Protocol Format Commands ,..." ,,'..." ,

Key Commands .." "'..." "'..."' "..."

Table of Illustrations

page

1

6

8

9

11

12

13

14

16

19

22

25

30

34

fig. title

1-1 General view 2-1 Fitting the battery 2-2 Electrical connections 2-3 Adaptor/charger connector 3-1 Instrument front 'panel 3-2 Measurement mode menu 3-3 Local pressure measurement

3-4 Sea level measurement 3-5 Altitude measurement 3-6 Process sub-menu 3-7 MaxiMin menu 3-8 Set-up menu 3-9 Communications set-up 3-10 Calibration

M-2912 Issue No.1

l .oN anssl Z l6Z-~

'puewwo:J AIUO AJenb e S! eJe41:AJano

"jJodeJJsel a.:Jufs 'SjOjja ou 0000 = 3l:1

sjojja s,/Jodaj t!3l:1 :aldwex3

:JewjoJ attJ uf sf fjufjJS attJ :ajattM

.pajOu6:1aJe spuewwo.:J jattJo 11\;f "JuawnJJsuf attJ

OJ Juas spuewwo.:J joJ Jas AIUO aje SjOjj3 :BjOKf

.L .9 elqel U! peu!!ep eJe sepo:J JoJJe e41

.peJeel:J eJe SJOJJe lie pueUJUJo:J

S!4! 5u!nss! Je!!'lt .peJJn:J:Jo JoJJe e4! !!

!es pue (xeUJ S!!q 9 L) S!!q se peJo!s eJe SJOJJe

e41 .pueUJUJo:J l3H !sel e4! e:Ju!s JoJJe Aues!JodeJ pueUJUJo:J AJenb S!41 .sJoJJe !JodeH :uo!!d!J:Jsea

l3H :!eUJJ°:JSn~8~S ..0 9 P89H -~H :pU8WWO:)

Lslenuew JaSn Ot7L Ida!!Alenuew .lesn Ot-L Ida

1DPI 740 User Manual

Read Battery Volts

1 Introduction

The Omega DPI 740 precision pressure indicator uses asilicon resonant pressure transducer producing a pressurereading in units of pressure measurement and altitude.The instrument is contained in a molded enclosure of acomposite ABS material and can be used as a hand-heldindicator or. using a retractable stand. as a bench instrument.The instrument can also communicate. through a serial RS232connector. with a compatible computer system or printer.

RB?

Read battery voltage

RB? query battery voltage

Reply:RB= <voltage>RB = 3.9 battery 3.9 volts

There is a query only command.Query:

RI - Read instrument type andversion number

Format'

Description:

Query'

RI?

Read device equipment. this returns theinstrument type on the network includingthe version of the code, in the form:RI = <string>where: the string is in the format:

'DPlnnn,Vm.mm'nn = instrument typem.mm = version and issue number

RI? query instrument version andissue number

RI = DP1740, V1.10

There is a query only command.

Figure 1-1 General view

M-2912 Issue No.1

l 'oN enssl ll6l-~"ON enssl ll6l-VIJ

eJnsseJd 6U!)jJOM eteS wnw!xe~(e Jeqw 9L£P)

e 6HU! 6l L (e Jeqw oog£ o~ g£)

e6HU!OOLO~L (e Jeqw 0O9l o~ g£)

e 6HU! 9L o~ L (e Jeqw OO£l o~ g£)

e 6HU! 8£ o~ L

'AJeno

"a/dwex3

.)jsewjOjje e4~ ~o e5ew! ~!q e4~ o~ 5u!puodsejjo:>

enleA lew!:>epexe4 e 4~!M spuodsej AJenb 'V

..lo.l.la A.taJ\a.lOj paJ.loda.l S! .lo.l.la ue .:1.:1.:1.:1 = 31f

paJe.lauafj S! .lo.l.la xeJuAse UalfM paJ.loda.l S! .lo.l.la ue tOOO = 31f

.jojje e4~ jeel:> O~ penss! eq ~snw

puewwo:> l3~ e41 .~!q jojje e4~ jeel:>

~OU seop esuodsej jojje :>!~ewo~ne u'V

.l-9 elqe 1 U! peu!~ep S! <)jsew jojje>

.Alle:>!~eWo~neS! e5essew jojje .3~" e4~ 'Sjn:>:>o jojje e4~ ~I

.~es ~! uo pe~:>e eq O~ sjojje ~o e5ew! ~!q e4~

seu!~ep <)jsew jOjje>enleA Oew!:>epexe4) ~!q9l'V .5u!~jodaj jojja selqeue puewwo:> S!41

<)jsew jojje> = 3'V

6u!J.lod9J JOJJe :J!JewoJny -3Y

'Se5UBJ el\!+BUJe+IB

"8TON(e Jeqw 09 L L o~ 09L)

e 5HU! v£ o~ II (:J!J~ewoJeq) e5ue~

JeeA/wdd 00 L> A~!I!qe~s

S:J % gvO.O+ b009+ O~ 0 L -) :Jo0l L o~ og L ~o e5ueJ e4~ Jel\o

S:J % £0.0+ (J o0v O~ 00) :J090 L + o~ ol£ ~O e5ueJ e4~ Jel\o

S:J % lO.O+ (J 00£ O~ 00 L) :Jo0L + O~ oo9 ~O e5ueJ e4~ Jel\o

.A~!I!qe~eedeJ pue s!seJe~sA4 .A~!JeeU!I-UON

A:JeJn:J:J';f

5u!~~!~ eso4 P/! (ww v) .L9 L .0 JO

P/O (WW 9) ,,9£l.0 Jo~:JeuuoJ

e..nssa..d

(v9dl) v ';f~3N pJepue~s 5u!lees

u!seJ Axode pue lee~s sselu!e~s .uo:J!I!S

.xeJAd 4~!M elq!~edwo:J se5 Au';f

(J o0L+ O~ o0v-) :J 009L+ O~ o0v- (J009+ O~00L-) :J 00lL+ o~09L

:uo!~d!J:Jsea

.~ewJo:J

:puewwo:)

:Wn!p8W 8JnSS8Jd

85BJO!S

5U!!BJ8dO

.8JmBJ8dw81

18/U9WUOA!AU3

.pUelUlUO:J S!4' JO~ AJanb oU S! aJa41 .AJano

.Zt pue t t 'Ot sesse-,ppe Juewn-,Jsuf

el/J sJes puewwo.? sfl/J 'Jf-'OMJeU

el/J uf sJuewn-,Jsuf ee-,l/J l/JfM

Ot = 'tf'tf :e/dweX3

.sassaJppefju!seaJ:Ju! Alle!,uanbas 0, )jJOM,aU

a4, U! S,UalUnJ,SU! a4, ~o SaSSaJppe a4, s,as

Alle:J!,elUO,ne ,I .)j:J°lq Japea4 pUelUlUO:J#a4, 4,IM pasn aq AIUO ue:J pUelUlUO:J S!41 :uo!,d!J:Jsaa

<SSaJppe a:J!"ap> = W lelUJ°:J

6ulsSa..pp8 :)!~8WO~nv -VV :pu8WW°:>

spU8WWO:) :)!~eWO~nv

(WW 9£) .l17' l = 41,d8p'(Ww 06) .179'£ = 41,P!M (ww 06l) .817'L = 1,45!84 ,,"' 8Z!S

(5>! 9'0) sqll'O ..".",.,"',"""""",.,""',.,',.,' (leu!wou) '1,45!8M

suo!suew!a

uo!~e:)!l!:)ads

99lenuew J9Sn 017L IdalenuelAl .lesn O~L Idaz

354 DPI 740 User Manual

Command:

Format:

Description:

CD- Calibration dateCD = <dd/mm/yy>

Sets calibration date, only valid in calibrationmode.

CD = 24/01/98set cat date to 24 January 1998

CD? query date of last calibration.Reply: CD = 24/01/97

Specification (contd)

DisplayRead-out 999999 LCD digits, 0.535' (13.6 mm) high

with additional 16 text characters

Overload indicationError code flashing

Response

Resolution

'xample:at nominal11 0% FS

Querynominal 2 readings/second

0.001 inHg (e.g., 1.034 inHg a)Example of a two point calibration

IV = 18 set-up input as inHg

PP = 123 PIN entered put instrumentinto calibration mode

CT = 1 perform two point calibration

Electrical Power SupplyBatteries 3 x 1.5 V alkaline size AA

Connections

external power adaptor/charger

.International power jack

6-way LEMO typeRS232 serial communications

Electrical safety

This instrument meets:

CP = 23.62 applied pressure 23.62 inHg

CP =32.48 applied pressure 32.48 inHg

CA calibration accepted

CD calibration date

""""""""""" BS EN 61010 as applicable

Electromagnetic compatibilityThis instrument meets"

..EN50081-1 (emissions)

...EN50082-1 (immunity)

rJes necessitatesContinuing development somespecification changes.

Command:

Format:

Description:

PP -PIN protectionPP = <pin>

This command is used to change the PIN ofthe instrument which is used to protect thecalibration data and configuration.<pin> = 123 calibration PIN code

pp = 123Example:

instrumen

PIN entered ;;

Query:into calibration mode

There is no corresponding query command.

M-2912 Issue No.1

.puewwo:J AJenb pe~e!:Josse ou S! eJe41

uoIJe.lqlle:J J.loqe X.JfjHuI Z'6.g a.lnssa.ld pallddE? Z'6.g = d.J

uoIJE?lqllE?:J JUlod OMJ w.l°J.lad t = 1.J

apow uoIJE?lqlle:J oJuIJuawn.lJsuI sJnd ;oa.laJua Nld E:Z't = dd

fjHuI SE? JndUI dn-Jas 8t = nl

.eJnpe:JoJd uo!~eJq!le:J e4~ s~oq'V

XJI.IOq8 UO!~8..q!l8:> -X:>


.epow ~ueweJnseewo~ SUJn~eJ ~uewnJ~su! e41 .AJowew

el!~elo/\uou s,~uewnJ~su! e4~ U! peJo~spue pe~eln:Jle:J eJe s~ue!:J!ffeo:J uo!~eJq!le:J

e4~ ue4~ puewwo:J dJ e4~ 4~!M peJe~Ue

ueeq e/\e4 s~u!od uo!~eJq!le:J fo Jeqwnu~:JeJJo:J e4~ fl .e~ep pe~eJq!le:J e4~ s~de:J:J'V

'VJ~deooy UO!~8..q!l8:> .y:>

puewwo:J AIUO AJenb e S! S!41

SJUlod uoIJE?lqllE?:JZ' pUE? t UaaMJaq Sajlnba.l Z" t =N.J

:eldw!?x3

:uo!~d!J:>sea

.~ewJo:J

:pu8WW°:>

ase:> ~!sueJl a

.adA~ a AeM-6pJepue~s o~ OL"J3l u!d-9 a4~ 5u!~:>auuo:> l£lS~ J°:J

alqe:> Jo~OepV' J

"AJeno

'i:)e! JeMod leUO!~eUJe~UI

UO!!:JeuuoJ

(wnw!xew) '1W 008 'Ja I\ II~nd~no :uo!~d!J:Jsaa

.~ewJo:J

:pUBWWO:)

AJano

zH 99-L17 "\tA 0 l (leU!WOU) .J'\t A 017~ 0+ 00 l

(N:JuoIJeJqlle:; JUlod OMJ wJoJJad t = 1:J

apow uoIJeJqlle:; oJuIJuawnJJsuI sJnd paJaJua Nld E:Zt = dd

Isd se JndUI dn-Jas 9t = /71

.8jnp8:>Ojd UO!~ejq!le:> P8!t!:>8dsa4~ ~no AJje:> o~ p8j!nb8j s~u!od uo!~ejq!le:>

wnw!xew pue wnw!u!w 84~ SUjn~8!:1

(NJ

JeMOd leuJe~x3

Je6Je4:J/Jo~dep'11

Je5Je4:J/JO~aepe JeMOa pue Se!Je~~eq peJ!N 8

(Jeqw 9 L .o~) 6HU! vOO.O~ (J 00£ O~ 00 L) :J o0L O~ o0v to e6ueJ e4~ Jel\o

A:JeJn:J:Je :J!J~ewoJeq pe:Jue4u3 'V'

suo!~dO

"ese:J 6u!AJJeJ '!!!

'e~e:J!~!~Je:J uo!~eJq!leJ "!!

(uO!~e:J!lqnd S!4~) OOZ'v'>llenuew J8Sn "!

:8/dweX3

:uo!"d!J:Jsea

:"ewJo:JS8!JOSS8:J:JV'

.5U!MOIIO~ 84~ 4~!M p8J81\!18P S! ~U8WnJ~SU! 841

suo!JdO pUR S9!.lOSS9:J:JV Z" ..pa.l!nba.l s~u!od

uo!~e.lq!le:J Jo .laqwnu ~a9 .N:> :pueww°:>

lenuew .lasn OtrL Ida £9lenuew .lQSn OtlL Idato

52 DPI 740 User Manual DPI 740 User Manual 5

Command:

Format:

Description:

Query"

CP -Enter Calibration PointCP = <value>

The calibration point value is given by <value>

in the currently selected units.

A query of this parameter CP? returns the

number of calibration points already recorded

by this command. The instrument also

indicates that it is ready for the next

calibration point.

Reply:

exampleCP = O no cal points

recordedCP=2 2 cat points

recorded

After entering all the points required to calibrate the instrument,

the accept calibration command CA must be sent to update

the data in the instrument's nonvolatile memory.

2 Installation

WARNING:DO NOT ATTEMPT TO CHARGE NON-RECHARGEABLEBATTERIES. TO PREVENT ACCIDENTAL CHARGING OF NON-RECHARGEABLE BATTERIES THE CHARGE LINK LK2 MUST BEIN THE DISABLED POSITION (X).

CAUTION:

Do NOT LEAVE OISCHARGEO BATTERIES IN THE INSTRUMENT.

OLD BATTERIES CAN LEAK AND CAUSE CORROSION.

WHEN FITTING THE BATTERIES MAKE SURE THE ELECTRICAL

CONTACTS ARE CLEAN AND OBSERVE THE CORRECT POLARnY.

N!lJ#-: For further information. refer to the safety page

at the front of this manual and to the battery

manufacturer.

2.1 Battery (Figure 2-1)

Three batteries are fitted in the battery compartment.

For non rechargeable batteries make sure the charging link

LK2 is fitted in the disabled positibn (X).

For rechargeable batteries make sure the charging link LK2

is fitted in the enabled position (,1).

N!lJ#-: The charging link LK2 is located on the

instrument PCB. To access th,s link remove the

top case assembly.

To replace the batteries, unscrew the captive screw and slide

off the battery compartment cover. Make sure the polarity of

the new batteries is correct.

If the battery capacity is low the display shows:

" The battery symbol (approximately 1 hour left).

" The flashing message Battery Very Low for 15 to 20

minutes.

" The message Batteries Dead! followed, after a short

time, Switching Off!! the instrument then

automatically switches off

M-2912 Issue No.1

'oN enssl Z L6Z-V\J'oN enssl Z l6Z-~

.5u!se:J JO~:Jeuuo:J Je~no -el\+

.u!d Je~ue:J -el\-

:JO~:Jeuuo:J u!d Je~ue:J .(UJUJ g.~) .L .0 .elod-OM~ e S! S!41

Je6Je4:J Ne~~e8

.ApoqJe5Je4:Je4~ 0~u04sndpue

Jo~depe ~ueUJe:JeldeJ e4~ u5!le .Apoq Je5Je4:J e4~ UJOJ~ Jo~depee4~ 4snd Jo~depe u!d JeMod e4~ e5ue4:J 01 .ep!MPIJOM

pesn eq ue:J ~!Un e4~ ~e4~ os SJO~:Jeuuo:J elqee5ue4:JJe~U!

~o ~es e 4~!M pe!lddns S! Je5Je4:J/Jo~depe leUo!~do e41

(E-Z puez-z e..n61.i)

suoIJ:)euuo:) le:)!..J:)913 Z.Z

A.la~~eB a4~ 6u!~~!:t L-Z a.ln6!:t

.pUeWWO:> dJ e4! 5u!sn .s!!un pe!:>elesAI!UeJJn:> e4! U! enle" pe!ldde e4! !ues eq !snw !uewnJ!su!e41 .sez!l!qe1s eJnsseJd e41 ue4M .eJnpe:>oJd e41 e1eldwo:>

01 peJe!Ue eq !SnW S1U!Od UO!1eJq!le:> e4! 410q .eJnsseJd

UO!1eJq!le:> !0 UO!1e:>!ldde e41 JO! ApeeJ MOU S! 1UeWnJ1SU! e41

~ = lJ :Alde~

edA1 UO!1eJq!le:> AJenb llJ

.SSeJ50Jd U! Uo!!eJq!le:> !0 edA!

e41 SUJmeJ llJ J~1eWeJed S!41 !0 AJenb 'i/ :AJeno

uoIJejqlle:J 8ult{:JJeW JUlod OMJ wjoJjadt = 1.:J :aldwex3

uo!~eJq!le:J5u!4:J~ew ~U!od OM~ ~ = <edA:lle:J>

.P!leA SeWO:Jeq

pUeWWO:J S!4~ eJO!eq epoW uo!~eJq!le:JU! eq ~snw ~uewnJ~su! e41 .pewJOlJed

eq o~ uo!~eJq!le:J !0 edA~ e4~ A!!:)eds :uo!~d!J:)sea

<edA~ le:» = 1:) :~eWJ°::1

adAJ UO!J8Aq!18~ Aj!~eds -.L:) :pU8WWO:)

.s5u!peeJ ~uenbesqns lie o~ UO!~:JeJJO:)u!e5 pue ~eS!!O ue se~eln:)le:) eJeM~!OS e41 .seweJ~Xe

5u!~eJedo e4~ U!4~!M pe!ldde eq o~ seJnsseJd 0M1 seJ!nbeJ

eu!~nOJ uo!~eJq!le:) e41 .e:)!Aep e4~ !0 ~nd~no e4~ Uo uo!~eJq!le:)

~U!od OM~ e wJOlJed o~ JeSn e4~ sMO11e pUeWWO:) S!41

Uo!~eJq!le:) JeSn -:)

spuewwo:t UO!~eAq!le:)

4--~~<b

~---:

MeJ:JS

el\!~de:J~I

I.~lenuew .l9Sn Ot7L Idalenuew .lasn OtrL Ida9


R$232 connections

Option C is the adaptor cable recommended for use with the

RS232 serial communication interface. The adaptor cable

has, at one end, 6-pin LEMO type connector and, at the other,

a 9-way D type connector. The instrument's serial

communication settings and the data terminal equipment

(DTE) settings must be the same. The recommended initial

settings are as follows:

Baud rate 9600

Data bits 8

Stop bits 1

Parity none

Handshaking none

Adaptor Cable

I Flow I Function I Pin No. -1-Pin No.

TxDRTSGND

CTSRxD

3

7

5

8

2

2

4

7

5

3

Pin No. Function

1 RxD input f-2 CTS input f-3 GND (screen) H4 not used5 RTS output -t6 TxD output -t

Set-up commands

Command: SA- Set instrument address

Format" SA = <nn>

Description: Set instrument address to <nn>" Changes

the network address of the instrument in the

range O to 98. Address 99 is used for global

commands,

Example: SA= 10 sets instrument address to 10

Query' SA? query instrument address

Reply" SA=10

Command: SU- Set-up "regular" unitsFormat: SUn = <units index>

Description: Selects the pressure units that appear as

default selection F2 in measurement mode,

Both required parameters must be specified

i.e" the push-button sequence n (1, 2 or 3)

and the <units index>.

Example: SU1= 16 sets first units (1) to psi

SU2= 18 sets second units (2) to inHg

Query" The corresponding query command returns

the index to the pressure units selected for

the specified option,

SU1?

Reply: SUn=<units index>

SU1=16

~

,. The function column for the D type connector usesRS232 terminology with respect to DTE.

2. In the D-type connector DTR and DSR should beconnected together as follows:

9-way pin 4 and 625-way pin 20 and 6

3. The instrument's sen81 communication settings canbe changed using the set-up menu.

M-2912 Issue No.1

l 'oN enssl ~ l6~-~

IO!J:)QUUO:) le:)!JJ:)QI3 z-z QJn6!.i

"PUBWWO:J AJenb 6u!puodseJJo:J ou S! eJe41

"SenIBf\ 4~oq6u!~~eseJ ~:Jeffe U! '6U!pBeJ ~UeJJn:J e4~ O~

IBnbe SenlBf\ WnW!U!W pUB WnW!XBW s~es

VIJd

:AJano

:UO!~d!J:JS8a

:~ewJo:J

:pueww°:>

:a/dwex3

:AJeno

(,<,pue ,>, puewwo:J Jd ees oslel

Senl81\ WnW!U!W

pu8 WnW!X8W ssaooJd sJaseH -Wd

OL = t/d :A/dal:1

tt/d

.suo!sJe"uo:> U! le"Je~u! pues :>!~ewo~ne

e4~ fo Je6e~u! ue 4~!M spuodseJ Nenb \f

.aJmeaj :JfJewoJne al/J a/qesfP O = 'r1'd

.uofsJal\uo:J l/JOL AJal\a an/el\ puas

OL = 'r1'd

.pelqes!p S! eJn~eef pues

:>!~ewo~ne e4~ .0 S! ,Jt, fl .,uo!sJe"uo:> 4~,Jt,

AJe"e pues, O~ spuodseJJo:> ,Jt, enle" e41

.6u!peeJ ~ndu! fo 6u!pues :>!~ewo~ne selqeu3

Jt = \fd

6U!p8eJ

Jo 6ulPuas °!JewoJne alqeu3 -'tfd

fj'Huf uf fj'ufpeaJ

:a/dwex3

:uo!~d!J:Jsea

:~ewJo:J

:pueww°:»

£9"6t' = YO :A/day

tYO

'puewwo:J AIUO AJenb e S! S!41

"5u!peeJ e4~ s~senbeI:J

(I:Jd

6u!pea.l ~a9 -lid

:a/dweX3

:AJeno

:uo!~d!J:>sea

.~ewJo:J

:pu8WW°=>

6t7lenuew .l9Sn 017L Idalenuew JeSn 017L Ida8


~

Example:pr=.-IIR\

Example:PC=>(IR)

Example:

Example:

T tare

PC= T(IR)

Full tare of input reading.

PC= TOR,1 00.00)

Define tare of input reading, subtracts 100

from reading. The value specified in the

command is in the currently selected units.

This tares the value but does not change

the displayed value.

< minimum

Defines the minimum value of the input

reading. To reset this value use PM

command.

> maximum

Defines the maximum value of the input


command.

O OFF

PC=OOR,200,20)

Define the derived OFF input value changing

both the <height> and <temp> parameters.

A altitude {also see command PA)

PC=AOR,120.00)

Define the derived ALTITUDE input value

changing the current or default setting of

<datum pressure> to 120.00.

Figure 2-3 Adaptor/charger connector


l oN enssl ll6l-V\jl .oN enssl ~ l6~-~

.JeJ/Ij

JuewnJJSU! /ewJOU elfJ J:Jejje JOU seop JeJ/!j S!lf.L :B1ON

'<pUBq> pUB <!UB!SUO:J

8W!!> 84! 6u!6uB4:J 6U!PB8J !ndu! J8!1!} 8U!}8a

( lO"O'9 l.O'~I)-=Jd

.le~l!. -:9ldlwex3

SUO!~!U!.9P SS9:)O.ld

(e!nu!w l) pelqeue

000 (X) pelqes!p (,..) pelqeue !sd 'Jeqw '6HU!

~no-ew!l

Nld

( l)!l) )jU!1 uo!~ejq!leJ

(l)!l) )jU!1 f5u!f5jelj:> Aje~~e8

(l:l Aq pe~:>eleS)

~uewejnseew ejnssejd to S~!Un

sf5u!~~es ~uewru~sul 8 UO!~aO

(e~nu!w ,) pelqeue

000 (X) pelqes!p (X) pelqes!p !sd 'Jeqw '6HU!

~no-ew!l

Nld

( l)ll) )jU!1 uo!~ejq!leJ

(l>ll) )jU!1 6u!6je4:> AJe~~e8

(l:J Aq pe~:>eleS)

~uewejnseew ejnssejd ~o S~!Un

sBu!~~es ~uewnJ~sui pjepue~s

:8IqB~ fiU!MOIIOl 84~U! UMO45 ~BWJOl 84~ U! 8q ~5nW <UO!~!U!l8P558:JOJd> 841 .~U8WnJ~5U! 84~ lo 558:JOJd

p8J!nb8J 84~ 58U!l8P pUB 5~85 pUBWWO:J 5!41:uo!~d!J:Jsea

<UOI~!U!t8p ss8:JOJd> = Jd .~ewJo:J

sse:)o.ld dn-Jes -:»d :pueww°:»

spuewwo:) ssa,:)o.ld

s5u!~~es 5U!MOIIO~ e~~ ~~!M pedd!~s S! ~uewnj~su! e~l

S6U!~~8S IR!~!UI £"Z

lenuew J9Sn O~~~ Idalenuew JaSn 011L IdaO~

DPI 740 User Manual 11IU -Set-up input units

Format: IU=<index>

Description: Set-up the units for the input in volatile

storage. The units are specified as <index>.

defined in Table 6-2.

A query of this command returns the index

units.

IU?Reply. IU = <index>

Example:

Command:

a reply of IU= 78 means units are ir)Hg

IA- Enable automatic sending of input

reading

Format: IA = k

Description: Enables automatic sending of input reading.The value 'k' corresponds to 'send every'k'th conversion'. If 'k' is 0. the automaticsend feature is disabled.

Example: IA = 10

send a value every lOth conversion.IA = 0

disable the automatic feature.

3 Operation

3.1 General (Figure 3-1)

The instrument is switched on by the ON/OFF push-button

and powers up in the last selected mode and units of

measurement. The instrument "times-out" after a period of

one minute if no push-button selections are made. To keep

the instrument in the powered-up state the ON/OFF and

MODE push-buttons should be pressed together. The display

briefly shows a "Time-out Disabled' message. Pressing the

MODE push-button steps through the three pressure

measurement modes. Pressing the SET push-button steps

through the set-up menu (described in 3.3).

3.2 Measurement Modes (Figure 3-1)

Selecting the MODE push-button, changes the measurement

mode between:

Local (OFE unprocessed pressure at the pressure port).

Sea (OFF calculated pressure at sea level).

Altitude (calculated height from pressure datum).

Selecting the push-button F2 changes the units of pressure

measurement, continuous pressing steps between three pre-selected units, the display shows the units for each

measurement mode.low passtilter- r~ JE -f'IL

,;; v=odoa:oJdJo~obbattery---condition

/ 'selectedselected 16 character unitsmode ::=-0 ~status line F1 SET \J--- function

function selection seiectlon

9 ~ Set-up menus

mode seiection ON/OFF control

Figure 3-1 Instrument front panel

:-xamp/e

A query responds with an integer of theautomatic send interval in conversions.

IA?Reply: IA = 10

M-2912 Issue No.1M-2912 Issue No.1

i

:AJeno

c."m

r-O on £ > -

(")+-r- "'~(":;;\

~ ~~

§"" m"'

"puewwo:J AIUO AJenb e S! S!41

C=I:JI '"fj'8) sJlun p8J:J818S, Ut b'utpe8J 8L{J SI <8nle/1> :8J8L{M

9nle/I>=1:J1 S811d8J JU8UJnJJSUt 8L{1

iI:JI"'6, 8fdw!?)

:uo!~d!J:>sea 5u!peeJ e JO! ~senbe'd

leWJ°:l:pUBWWO;)

L\:!I

6u!pee.l .ndu! .89 -III

= Jndl.

d=;p

, -n-n

~ "'

(0

I'''\I:;;\ (/) ~

(I) \::)m(O~ L I;:j\ I J~i@\!~ I @~» ~

~~ § ~

"" 8"' m

fwex

oC/!:AJeno

~

-~ 1

-~:o ~IS'\ 8

.11~ ~m"'., 0 "'

+-(!)-m ~~ +- -iP. "' ' -.~ (:;;'\ ~ rn' ~..~ -i

,; ~ t +-I~ +-

~ II rn "' ~~ o rn ~~ ~" C; 0 ~!.(j) ~ ~ ..i o :io m "' ~.. ." -,-I -.rn

~ ~

"n"'

.Je~eUJeJed

pe~:>eles AI~UeJJn:> e4~ ~o uo!~e5oJJe~u! e4~

sMOlle pueUJUJo:> AJenb 5u!puodseJJo:> e41

.JuawnJJsu!S!IIJ JoJ d aJnssaJd asn AluO :8j1jJV

~ndu! eJn~eJedUJe~ 1

~ndu! e5e~lol\ !\

~ndu! ~ueJJn:> I

~ndu! eJnsseJd d:5U!MOIIO~ e4~ ~o Aue eq ue:> <ed~ UJeJed>

.pueJnseeUJ e4~ se!~!:>eds J, xepu! e4~ .<edA~

UJeJed> Je~eUJeJed eJnseeUJ O~ ~ndu! dn-~es

"'C'~

:UO!~d!J:JS8a>~ 5~ ...-I ~C 01C 5.m

<edA" weJed>=JI .eWJ°:!

~ndu! dn-~es -:>1 :pu8WWO:>

spU8WWO~ ~ndul

.leUO!"do eJe [ ] U! pesol:Jua

sJa"aweJed .A"!Jel:J JO} paAOWaJ uaaq aAe4 sJa":JeJe4:>

5u!"eu!wJa" pue "Je"s a4" Uo!"d!J:Jsap pUeWWO:J 5U!MO110}a4" UI .l.9 U! paq!J:Jsap "eWJO} a4" }0 aJe spUeWWO:J 1I"v'

~9S pu8WWO:> ~.9

L .oN enssl Z L6Z-iI"'J

nuew epow ~ueweJnseew z-£ eJn5!.


Local (QFE) Measurement (Figure 3-3)

This is the direct measurement of the absolute pressure

sensed at the pressure port. In addition to measuring local

pressure the instrument can, with the use of a hose and a

connector, measure absolute pressure at a system test point.

PIN commands

PP=<pin> PIN protect commandAutomatic Commands

AA=<device address> Automatic device addressAE=<error mask> Automatic error reporting

(see table 6-1)

Read Commands

RB? Read battery volts

RI? Read instrument type and version

numberR E ? Read error status (see table 6-1 )

Protocol Format Commands

FC=<flag> Enable/disable message checksum

FA=<flag> Enable/disable addressed mode

Key Commands

KM=<flag> Front panel key-pad operating modeunits of measurement -

press F2 to change

between three units.

Figure 3-3 Local pressure measurement


measurement mode -

pressing F1 changes

to tare (T)

B~ep UO!~eJq!leJ aJ

~Joqe UO!~eJq!le:) X:)

~dB:>:>e UO!~eJq!le:) 'v':)

.pbBJ s~u!od uo!~eJq!le:> Jo .ou ~B~ IN:)

~u!od uo!~eJq!le:> JB~U3 [<BJn~eJBdwB~>'I<BnleA>=d:)

BdA~ uo!~eJq!le:> AJ!:>BdS <BdA~ le:»= I:)

SpU8WWO:) UOp8Aq!l8:)

S~!Un Jeln5BJ dn-~BS <XBPU! S~!Un>=Uns

SSBJppe ~UBWnJ~SU! ~BS <UU>='v'S

SpU8WWO:) dn-1.9S 1.U9WnA1.SUI

SBnleA WnW!U!W

pue wnW!XeW ssB:>OJd ~BSB~ ~d

5U!peBJ SSB:>oJd

Jo 5U!PUBS :>!~ewo~ne Blqeu3 ,,= 'v'd

5U!peBJ ssB:>oJd ~B~ l ~d

Bpn~!~le <BnleA>'(~I)'v'= :)d

:1:10 <BnleA>'<BnleA>'(~I)O= :)d

wnw!u!w (~1)<= :)d

wnw!xew (~1»= :)d

<BnleA>'(~I)1 = :)d

BJe~ (~I)l=:)d

JB~I!J <BnleA>'<BnleA>'(~I)-= Jd

SSB:>OJd dn-~BS <UO!~!U!JBP ssB:>oJd>= :)d

SpU8WWO:) SS9:)OAd

5u!peeJ

~ndu! Jo 5U!PUBS :>!~ewo~ne elqeu3 "='v'1

(l-9 Blqe~ BBS) S~!Un ~ndu! dn-~es <XBpU!>=nl

5U!peBJ ~ndu! ~B~ l~1

~ndu! dn-~es <BdA~ weJed>=JI

SpU8WWO:) Jndul

."U!I

le!Jes e4~ 5u!sn pewJoJled eq ue:> Suo!~:>unJ 5U!MOIIOJ e41

AA8WWns pU8WWO:) £.9

Juawa.lnseaw laAal eas ~-£ a.ln6!.i

.::>0 U! eJmeJedwe~ J!e le:>ol e4~ pue (epow epn~!~le U! pe~:>eless~!un) ~ee! JO SJe~ew U! lellel ees elloqe ~46!e4 ueew eJe

sJo~:>e! uo!~:>eJJo:> OM~ e41 .pe~:>eles S! (:1:10) .8S ue4M enlelleJnsseJd e4~ ~:>eJJo:> O~ AJowew el!~elolluou U! peJo~s u!eweJ

pue e~!s Jeln:>!~Jed e JO! peJe~ue eJe sJo~:>e! uo!~:>eJJo:> ese41

.~.p 8Jn~.J8dw8~ pu. ~'16!8'1 1.001 6U!~~8S

uoIJ:JaJJo:J e JnoqJIM .:/.:/0 jO al\lJel\lJap e SI HNO :BfON

.eJmeJedwe~ J!e le:>ol e4~ pue lel\el ees el\oqe ~45!e4

le:>ol e4~ uo peseq enlel\ pe~eln:>le:> e S! pue lel\el ees ueew

~e eJnsseJd :>!J~ewoJeq ~o (::1::10) uo!~e~ueseJd le:>!5oI0JOe~ewe4~ S! ~I .eJnsseJd lel\el ees e4~ seJnseew epow S!41

(17-£ a.ln6!:I) ~uewe.lnseaw (:1:10) leAe, ees

lenuew .lasn °"L Ida171. lenuew JeSn Ot7L Ida £11


example program

#sa?; query instrument address!SA=OO; reply address is 00#fa=1; put instrument in addressed mode#0099ic=p; send command to instrument 00 from

instrument 99 input channel is pressure#0099pc=-(ir.1 0.1 ); set-up process channel to filter

.input reading ir time constant 10. band l'#0099iu=16; units to psi#0099pr?; get reading from process channel!9900PR1 =14.318; reply of pressure in psi (filtered reading)#0099ir?; get unfiltered reading!9900IR=14.318; reply of pressure in psi#0099iu=18 units to inHg#0099pr?; get reading from process channel!9900PR1 =29.152; filtered pressure reading in inHg#0099fa=0; take OFF addressed#iu?; query units!iu=18; units = 18 = inHg (see table 6-1)

This example is reproduced using OBASIC in Table 6-3.

The instrument stores the local height and temperature dataused in the sea level pressure measurement in nonvolatilememory. To enter this data proceed as follows:

1. Press the MODE push-button to select sea level pressuremeasurement mode (confirmed by the display showing 'Sea'on the status line).2. Press F1 to show the measurement menu.3. Press F2 selecting the SET-OFF parameter (confirmedby the display flashing 'Enter Height ASL ').4. Press either F1. F2 or SET to allow the height to beentered (the display stops flashing).5. Use F1 to increase the height value and F2 to decreasethe height value.N.D.l#.: Pressing and holding either Fl or F2 changes the

value at a fast rate. Pressing and holding MODEand either Fl or F2 accelerates this fast rate.

6. When the height is correct press SET. the display changesto flash 'Enter Temp'.7. Repeat steps 4, 5 and 6 to enter the temperature value.The display returns to sea level pressure measurement.corrected using the new height and temperature data.

N-9-t#.: Pressing the MODE push-button steps menuback one setting, allowing a value to becorrected.

M-2912 Issue No.

d=J10066i

.eJnsseJd 6u!Jnseew S! leuue4:> ~ndu! e4~ ~e4~ se~e:>!pu!

66 ~uewnJ~su! o~ 00 ~uewru~su! WOJf ~ues AldeJ 6U!MOIIOf e41

<Jo~eu!wJe~><sJ>xxSSPPi

.pe~eJdJe~u! ~ou pue >lJOM~eUe4~ punoJ peo4:>e eJe Se!lde~ .~ueJeff!p S! Jo~e:>!pu! ~Je~s e4~

~de:>xe uJe~~ed Jel!w!s e MOIIOf s~uewru~su! e4~ WOJf Se!lde~.lleuue4:>~ndu! uo

Je~eweJed e4~ JOf 00 ~uewru~su! se~e6oJJe~u! puewwo:> S!41

<:Jl><~J>(JI6600#

Jusws.lnsesw Spm!JI~ 5-£ s.ln6!.i

5HU! Z6.6Z o~ ~Inelep

epn~!~le

U) eJe~ o~ e~eln:Jle:J

se5ue4:J ~:J 5u!sseJd o~ pesn

\eJnsseJd wn~ep

/

SJeleW pue lee!ueeMjeq

dels 01 ~.:J sseJd

-epnj!lle !0 SI!Un

...,LJ

a/dwexa.puewwo:> e4~ o~ Je~:>eJe4:> ( e4~ 6u!ppe Aq pe!Jenb

eq ue:> e~ep .s~uewnJ~su! o~ spuewwo:> 6u!pues o~ Uo!~!ppe ui

A~!I!~8J A.leno

.6HU! ~o s~!uneJnsseJd ~:>eles pue eJnsseJd eJnseew o~ leuue4:> ~ndu! dn

-~es o~ 00 ~uewnJ~su! o~ 66 ~uewru~su! Aq ~ues puewwo:> S!41

<:Jl><I:!J>9l=nl:d=JI6600#

301-1111

1;;;:11

~

e.l8i

8{dweX8:p8Sn 8q ue:J ,:, JO~eJed8S puewwo:J 841

<:Jl><!:1J>9l=nld=JI6600#

a/dwexa

.puewwo:J 4:Jea 4~!M ~uas aq O~ aAe4 ~ou Op SaSSaJppe a:JJnos

pue UO!~eU!~Sap a4~ se Ja~sueJ~ e~ep ~ua!:J!~~a aJow e sMolle

5!41 .~a>l:Jed e~ep e U! Ja4~a6o~ pa6u!J~s aq ue:J spuewwoJ

.paJou6! S! puewwo:J a4~ JO pa~aJdJa~u! S! puewwo:J

a4~ sa4:J~ew S!4~ ~I .ssaJppe s.~uawnJ~SU! a4~ ~su!e6e JO 66

ssaJppe leqol6 a4~Jo~ pa>l:Ja4:J S! ssaJppe uo!~eu!~sap paA!a:JaJa4~ sJa~:JeJe4:J uo!~eu!wJa~ a4~ 6U!A!a:>aJ UO .,#, e S! Ja~:>eJe4:>

>I:J°lq puewwo:J a4~ ssalun ~uawnJ~su! ~xau a4~ o~ uo pao4:Ja

AI~Ue~SU! aJe Aa4~ ~uawnJ~su! a4~Aq paA!a:JaJ aJe sJa~:>eJe4:J sV

.s~uawru~su!lie Aq paz!u6o:JaJ ssaJppe leqol6 e S! 66 ssaJppe a41

lUeWeJnseew *0 eW!. e4. .e eJnsseJd pUnoJf5 Ple!*J!e

JO eJnsseJd leAel ees enJ. se 4:)ns Jesn e4. Aq peJ!nbeJ JO

UMOU'i Wmep eJnsseJd pe!*!:)eds e eq ue:) wmep S!41 .nuew

Il"\f-13S e4. Aq peJe.ue eq ue:) wmep eJnsseJd peu!*ep

Jesn"\f .(Jeqw 9Z.£ lO l) f5HU! Z6.6Z '"\fSI e4. S! wmep eJnsseJd

.lneJcep e41 .v86l :66l 9Z S8 U! peu!*ep selqe. eJe4dsoW.epJepue.s O"\fJI 0. f5U!pJO:):)e eJnsseJd le:)°1 WOJ* pe.eln:)le:)

eJe epm!.le *0 s.ueWeJnSee~ .Wmep eJnsseJd :)!*!:)eds e pue

leAel e UeeM.eq e:)ue.S!p le:)!.JeA e4. SeJnSeeW epoW S!41

(9-E e.ln6!.i) ~UeWe.lnS8ew epn~!~IY

lenuew ..esn 017L Ida91. lenuew .lasn OvL Ida 1.17

40 DPI 740 User Mlanual DPI 740 User Manual 17

6.2 General Command Format

The instrument is controlled by a sequence of letter codes,

some commands require numeric values to follow the letters.

The correct number of parameters must be sent for the

particular command. The instrument accepts upper-case or

lower-case letters.

Commands should be in the form:

< sta rt> d d ssxx: < CS > <term i nator>

where

<start> is the start of a command block indicator that canbe * or # character, The * character causes all command

block data to be echoed around the network, The # character

suppresses the echoing of the data block and can be used for

commands such as AA -automatic addressing.dd is a two digit destination address 00 to 99

ss is a two digit source address 00 to 99

xx is a two character command, This can be followed

by additional data, a number can be added to this commandto select a channel.

<CS> is a block checksum and takes the form' NN

where NN is a two digit checksum that is the modulo lOO sum

of all the ASCII codes of the character in the string including

the ':',

Entering a Pressure Datum for Altitude Measurement

The instrument stores the pressure datum used in altitude

measurement in volatile memory with a default value of 29.92

inHg. To enter a new pressure datum proceed as follows.

1. Press the MODE push-button to select altitude

measurement mode (confirmed by the display showing

'ALTITUDE' on the status line).2. Press F1 to show the measurement menu.

3. Press F2 to change the altitude settings by selecting

'SET-ALT".4. Press F1 if the datum required is the ISA. To enter any

other datum press F2.

5. Press either F1, F2 or SET to allow the datum to be

entered (the display stops flashing).

6. Use F1 to increase the datum value and F2 to decrease

the datum value.

N!lt#-: Pressing and holding either Ft or F2 changes thevalue at a fast rate. Pressing and holding MODE

and either Ft or F2 accelerates this fast rate.

7. When the datum value is correct press SET, the display

returns to altitude measurement corrected using the new

pressure datum.

N!lt#-: Pressing the MODE push-button steps menu

back one setting, allowing a value to be

corrected.~. This checksum feature can be disabled sothat the instrument does not usechecksums, in which case the checksummust not be sent. When the checksumfeature is enablea; commands are onlyinterpreted if the checksum is correct. Anerror IS reported if an incorrect checksum isreceived.

<terminator><CR><LF:

is the string termination characters

L 'oN enssl l L6l-V-J

.peAeldsfP eq OJ [jufpeej elqeJs e pue

pe/1fe:Jej eq OJ eldwes el/J jOj peMolle eq Jsnwew!J l/[jnoue 'dn-jeMOd Je e/1!J:Je sf jeJI!J el/J pue

e[jjel sf eldwes el/J uf JueJsuo:J ew!J el/J uel/M BION

las aq

Pln04s 3VIJl1 pue aN'\t8 }0 sJa~aweJed OM~ a4~ .UO 6u!4:J~!MS

aJO}a8 .SapoW ~uawaJnseaw aaJ4~ lie U! s~uawaJnseaw

lie o~ pa!ldde S! Ja~I!} ssed Mol a4~ Uo pa4:J~!MS ua4M

.le~l!:t

.aJe~ alqes!p o~ l:J JO aJe~ alqeua o~ l:J ssaJd .9

.sUo!~do aJe~ a4~ Ma!" o~ u!e6e l:J ssaJd .v

.sUo!~do ssa:JOJd a4~ Ma!" o~ l:J ssaJd .£

.nuaw ~uawnJ~su! a4~ Ja~ua o~ l:J ssaJd .l

.paJe~ aq o~

~uawaJnseaw a4~ ~:Jalas o~ uo~~nq-4snd 3aOVIJ a4~ ssaJd .l

.SM0110} se paa:JOJd .UO!~:JUn} aJe~ a4~ alqes!p

pue alqeua 01 .10qwAs e.lR~ a4~ sa4sel} Aelds!p a4~ .palqeua

S! UO!~:JUn} eJe~ e4~ ua4M .s~ueweJnseaw ~uenbesqns

lie WOJ} enle" paJnseew AI~UesaJd a4~ s~:JeJ~qns UO!~:JUn}

eJe~ a41 ."peJe~" Allenp!"!pu! eq ue:J ~ueweJnseew 4:Je3

e.lR.l

.p8~Joddns ~OU 8JB 5U!)jB4SPUB4

8JBM~~OS pUB 8JBMpJBH .8:>!A8P ~X8U 84~ ~o 8U!18A!8:>8J 84~ o~

p8~:>8UUO:> 8:>!A8P 8UO ~O 8U!1 ~!WSUBJ~ 84~ 4~!M 5u!J B ~O S~S!SUO:>

)jJOM~8U 841 .(66 o~ 0) SS8JppB 8nb!un B SB4 8:>!A8P 4:>B8

.S8:>!A8P ~O )jJOM~8U B O~U! p8~:>8UUO:> 8q UB:> ~U8WnJ~SU! 841

8pOW p8SS8.1ppy

.p8J!nb8J S! 5U!SS8JppB ou lj~!M J8~ndwo:>

IOJ~UO:> B O~ AI~:>8J!P p8~:>8UUO:> 8q UB:> ~U8WnJ~SU! 8UO

8pOW ~:)8.1la

.B58WO ~:>B~UO:> UO!~BWJO~U! J84~Jn~ JO~ .p8q!J:>S8p

pUB P81!B~8P 8JB ~U8WnJ~SU! 84~ o~ AlddB ~B4~ SpUBWWO:>

84~ UO!~:>8S S!4~ ui .(lJnO) 8:>B~J8~UI UO!~B:>!UnWWoJ

IBSJ8A!Un B58WO 84~ S! ~U8WnJ~SU! 84~ Aq p8Sn IO:>O~oJd

SUO!~B:>!UnWWo:> 841 .8pOW p8SS8JppB 84~ U! ')jJOM~8U B ~O

~jBd se jO epow ~:Jej!p U! Je4~!e pesn eq ue:J ~uewnj~su! e41

uo!~onpo.l~ul ...9

SUO!~e:)!Unww°:) 9

u!w/xell\J "

J8~1!:J "

8Je1

"SAeM 5U!MOIIO~

84~ U! S~lnS8J ~U8W8JnSe8W 84~ ss8:>OJd ue:> ~U8WnJ~SU! 841

(9-£ 9.1n6!~) S~U9W9.1nSe9W 6U!SS9:)O.ld

6£lenuew .l9Sn 017L Idalenuew JaSn 017L Ida81.


Figure 3-6 Process sub-menu

M-2912 Issue No.1

l 'oN enssl ~l6~-V'Ij

jJO P8l/.?JfMS Ju8wnjJsuf 8l/J l/JfM p8jOJSUfeW8j pue 81IJeIO/1UOU 8je Sj8J8Wejed j8JlfJ 8l/.L :B"IiW"

.esn JOt ApeeJ pue peJo~s s6u!~~es Je~l!t MeU

e4~ 4~!M epow ~ueWeJnseeW O~ ~UeWnJ~SU! e4~ SUJn~eJ 13S

6u!sSeJd .enleA 3VIJU e4~ Je~ue o~ 9 pue 17 sde~s ~eedelj .9

.enleA peJ!nbeJ e4~ SMo4s Aelds!p e4~ ue4M 13S sseJd .g

.enleA ON\t8 e4~ ~es o~ "' Z:J pue i l:J esn .17

.s6u!~~es lj31ll:J ~:Jeles o~ Z:J sseJd .£."lj31ll:J NlVIJ/X\tVIJ" SMO4S eU!1 sn~e~s puee:J!M~13S sseJd .Z

.eJnsseJd 6u!Aelds!p

pue epow ~ueweJnseew U! S! ~uewnJ~su! e4~ eJns e)jeVIJ .l

.SMOIIOt se pee:JoJd

'!JodeJnsseJd e4~ U! s!Jqep ou S! eJe4~ ~B4~ eJns e)jBlIIJ .~ueBJe~ep

PI!W pUB 4~ol:> eeJ~-~u!1 dWBp B 4~!M ~!Un e4~ ~o eSB:> e4~ uBelJ

6U!UR91:> E"S

, J!edeJ JOt ~ue6e JO JeJn~:)etnuew

e4~ o~ ~uewnJ~su! e4~ uJn~e!,j 'HOHH3 W3.1SAS SMO4S

Aelds!p e4~ pe~dnJJo:) sewo:)eq uo!~eJedo s,~uewnJ~SU!e4~ JO je:)npsueJ~ e4~ to dn-~es JO uo!~eJq!le:) e4~ ti

.no seo6 e6essew JoJJe e4! I!!un eJnsseJd

pe!ldde e4! e:Jnpe!:J .HOHH3 39NWH3AO e6essew

e4! se4sel~ Aerds!p e4! enlel\ eJnsseJd ele:Js-lln~ e4! ~o

%0 II spee:Jxe !uewnJ!su! e4! Aq pesues eJnsseJd e4! ~I "

s86esS8W ..0 e peAelds!(]

6u!pu!l Jlne:f z.s

"BU!UBel:J pUB Bu!pu!t ~lnBt'~ueWe:JBldeJ AJe~~Bq O~ pe~!W!1 si ~iun S!4~ uo e:Jueue~u!ew JeSn

IB.lQUQ9 ...9

Q:)ueuQ~u!ew 9

l£lenuew .l9Sn 017l Idalenuew .lasn OtlL Idaoz


Switching the Filter ON or OFF

To switch the filter on proceed as follows:

1. Make sure the instrument is in measurement mode and

displaying pressure.2. Press F1 to enter the instrument menu.3. Press F1 to enter view process options.4. Press F2 to view the next option (FILTER).5. Press F1 to view the filter options.6. Press F1 to switch filter on or F2 to switch filter off.~: When the filter is switched on, the display

shows the = symbol.

MAXIMINIn normal measurement mode the maximin measurements

are recorded as a background task. The store is reset when

the instrument is switched on or can be reset at any time.

Two-point calibration

Proceed as follows.


displaying pressure.

2. Press SET until the display shows GAL on the status line.

3. Press F1 to select the GAL menu.

4. Use F1, F2 and SET to enter the PIN.

5. Press F2 to select a two point calibration, the displayprompts for the first calibration point.

6. Adjust the pressure standard for the first calibration

point.

7. Use F1 t and F2 J. to set the first calibration value.

8. When the pressure is stable press SET to enter the firstcalibration point. The display prompts for the secondcalibration point.

9. Repeat steps 5 to 7 for the second calibration point.

10. Press F1 to accept the calibration values, the displayprompts for the calibration date.

11. Use F1 t and F2 ~ to set the calibration date.

M-2912 Issue No.1

l 'oN enssl ll6l-~

UOI}e.lqlle:> Ol--E 9.1n61.inuaw NIW/X"f/W L-t a..n6!.i

lenuew .lasn 017L Idazz

DPI 740 User Manual 2334

~ Procedure (Figure 3-10)

This sub-menu divides into two selections. a one-point

calibration and a two-point calibration.

CAUTION: THiS INSTRUMENT CONTAINS STATIC SENSITIVE

COMPONENTS HANDLE WITH EXTREME CARE.

A The calibration procedure is protected by a PINand the GAL option link LK1 located on the PGB.To carry out a calibration LK1 must be in the II'

position.

Viewing the Maximum and Minimum

Proceed as follows.

1 .Make sure the instrument is in measurement mode and

displaying pressure.2. Press F1 to enter the instrument menu.

3. Press F1 to view process options.

4. Press F2 until the status line shows MAXIMIN.

5. Press F1 to view maxImin options.

6. Select MAX (F1) or MIN (F2) the status line shows the

recorded value.

7. Press F1 then F2 to switch off either the maximum or

minimum value. Press F1 twice to view the other maximum

or minimum value.!/R1§: The MaxiMin options must be re-se!ected after

changing to another measurement mode.

"""'- ~ .' "P~" -~"...

--SET

-With the instrument connected toan appropriate pressure standard.access the calibration sub-menuthrough the set-up menu.

One-Qoint calibrationFor the one-point calibration the instrument stores therelationship between pressure and output.

Important noteThe calibration carried out at manufacture is a twO-POI/7tcalibration against a pressure standard traceable to NationalStandards. Carrying out a one-point calibration cansignificantly downgrade the instrument's accuracy if in doubtconsult the manufacturer before proceeding.

Two-goint calibration

This calibration provides a more accurate reading of the

applied pressure, the instrument calculating a more complex

correction for the displayed reading.


l 'oN enssl Z l6Z-~L 'oN enssl Z L6Z-~

.ele:Js-lln~ ~o %00 ~ pue 08.09 .Ov .Ol .0 ~o SleAJe~U! 6u!seeJ:Jep

ue4~ pue 6u!seeJ:Ju! ~e )j:Je4:J o~ S! eJnpe:JoJd pepuewwo:JeJ e41

.~no pe!JJe:J eq ue:J ~uew~sn!pe uo!~eJq!le:J e AJesse:Jeu ~I

.~uewru~su! e4~Jo~A:JeJn:J:Je peJ!nbeJ e4~ 4~!M peJedwo:J eq ue4~ ue:J

se:JueJe~~!p pe~snfpe e41 .pepJo:JeJ se:JueJe~~JP e4~ .(spJepue~sleuo!~eN o~ pe:JeJ~) A:JeJn:J:Je JO~ s~uew~snfpe Aue Je~~e .pue pJepue~s

eJnsseJd e 4~!M peJedwo:J eq Plno4s ~uewru~su! e4~ ~o s6u!peeJ

e41 .sleI\Je~u! ueso4:J ~e ~no pe!JJe:J eq Plno4s )j:Je4:J uo!~eJq!le:J V'

)j:)e'l:> UO!~8.1q!l8:>

.e:>!AJes UO!~eJq!le:> pe~!peJ:>:>e lSIN'peJ!nbeJ ~! 'pue el\!SUe4eJdwo:> e sJe~~o JeJn~:>e~nuew e41

.eJnpe:>oJd ~uew~snfpe uo!~eJq!le:> e ~no AJJe:> 'uo!~e:>!~!:>eds

e4~ U!4~!M ~OU S! ~UeWnJ~SU! e4~ ~o A:>eJn:>:>e e4~ ~I

.leuUosJeduo!~eJq!le:> ~uewnJ~su! pe!~!lenb Aq ~uewuoJ!l\ue pelloJ~uo:>e U! ~no pe!JJe:> eq Plno4s seJnpe:>oJd 6U!MOIIO~ e41

.A:>eJn:>:>e peJ!nbeJ e4~ ep!l\oJd o~ ~uewd!nbe

Jel!w!s JO pJepue~s eJnsseJd ~46!eMpeep pe~esuedwo:>

e S! uo!~eJq!le:> JO~ ~uewd!nbe pepuewwo:>eJ e41

.s4~uOW Z l AJel\e pe)j:>e4:>

S! ~! ~e4~ pepuewwo:>eJ S! ~! e~eJn:>:>e Ae~s o~ ~uewnJ~su! e4~J°:J .e~e:>!~!~e:> uo!~eJq!le:> e 4~!M pe!lddns S! ~uewru~su! e41

NOI.LYII81'Y:) t'

££lenuew .lasn 017L Idalenuew .lasn OtlL IdatoZ

32 DPI 740 User IYlanual DPI 740 User Manual 25

Sending Measurements to a Printer or PCThe measured pressure or altitude can be sent to a printer or

PC through the RS232 communications connector. The

instrument sends the current selected measurement modedata.

3,3 Set-up Menu (Figure 3-8)

To change other less used facilities and background tasks,

enter the set-up menu by pressing the SET push-button.

Pressing SET again steps to the next sub-menu set. In each

sub-menu the function push-buttons F1 and F2 are used to

select the required task.Sending Data

Proceed as follows:

1. Set the RS232 communications parameters of the

instrument to match the device receiving the data.

2. Press SET until the display shows PRINT on the status

line.

3. Press F1 to select the PRINT menu. The display shows

the flashing message 'Ent Print Period'. This is the rate

at which measurements are transmitted by the

instrument.

4. Use F1, F2 and SET to enter the print period. Pressing

SET returns the instrument to measurement mode with

the instrument transmitting data at the selected rate.

Error Message

When an error is detected an error message is sent in the

following form:

ERRORnn -where nn is a decimal number.

Error numbers are'

041632

Bad data detected by checksum

Hardware fault

Pressure outside range

Figure 3-8 Set-up Menu


(:!009) '090'HU!

(JaV) 'v00'H~~

baOl) 'Ol0'H~~

bav) 'v00'HU!

baOl) 'Ol0'HU!

5HU!

,~~/~ql

!sdw~e

JJO~

O'Hw

O'HW:J

O'HWW

5Hw

5HW:J

5HWW

,w/!5>1

,w:J/!5>1

ed~

ed>l

ed4

ed

Jeq

Jeqw

£~

~~

L~

O~

6L

8L

LL

9L

9L

PL

£L

~l

-L L-DL-6-8-L-9-9-v-£-l-L-a

"auf/ smeJs alfJ uo aJn/le.:/

AjfJa;1 SMolfS A/jafJq Ae/dsfP alfJ pafjfJa/I JOU j/ :9ION

lS!1 5U!M0110} e4+ WOJ} Aue 0+ e5ue4:J eq ue:J+ueweJnseew eJnsseJd }0 s+!Un ese41 !sd pue Jeqw '5HU! .eJe

+ueweJnseew eJnsseJd }0 s+!Un s,+ueWnJ+SU! e4+ 'pedd!4S

ue4M .AJOWeW el!+eIO"UOU U! Ple4 's+!un pe+:JeleSeJd eeJ4+

UeeM+eq +ueweJnseew eJnsseJd }0 s+!Un e4+ se5ue4:J l;j

5u!sseJd SepoW +ueWeJnSeeW le"el ees JO le:J°1 e4+ U! ue4M

S"Un

.eu!1 sn~e~s e4~ uo pe~de:J:JV'

Nld MeN SMO4S AI~e!Jq Aelds!p e4~ Alln~sse:J:Jns pe!~!JeA ~I .L

.AJ~ue e4~ A~!JeA O~ Nld MeUpuo:Jes e4~ 4~!M Nld MeU ~SJ!~ e4~ seJedwo:J ~uewnJ~su!

e41 .u!e5e Nld MeU e4~ Je~ue o~13S pue i l:J .J, l:J 5u!sn .9

.Nld MeU e4~ Je~ue o~ 13S pue i l:J ' J, l:J 5u!sn .9

.Nld ~ueJJn:J e4~ Je~ue o~ 13S pue i l:J .J, l:J 5u!sn .17

.Nld e4~ e5ue4:J o~ l:J sseJd .£

.eu!1 sn~e~s e4~ uo Nld SMO4S Aelds!p e4~ I!~un 13S sseJd .l


pue epow ~ueweJnseew U! S! ~uewnJ~su! e4~ eJns e)jeV\) .l

SMOIIO~ se pee:JoJd

Nld a'l~ 6u!6u8'1:>

%OOL-9L AJene8

:a/dwexa

"spueq %9ZU! eBe~ue:JJed e se UMo4S A~!:Jede:J

eBJe4:J Iln! e4~ O~ peJedwo:J eBJe4:J

A~!:Jede:J e4~ SMo4S nuew-qns S!41

AAeJJ88

.000 S! aJn.:>e}nuew .e .as N Id .Ine}apa41 .nuaw uo!.eJq!le:> a4. Bu!ssa:>:>e aJo}aq paJa.ua aq

.snw 4:>!4M 'N Id e Aq pa.:>a.oJd S! uo!.eJq!!e:> .uawnJ.su! a41

N Id MeU 8 6u!.le~U3

I.£lenuew .l9Sn 017L Idalenuew .lasn 017l Idagz


Changing the preselected units of pressure

Proceed as follows.

1. Press the SET push-button.

2. Press F2 to select UNITS.3. Use F1 and F2 move up and down the list of units.

4. Press the SET push-button to select the required unit.

5. Repeat steps 3 and 4 to select the second and third units

Notes

"he storing of the new unitsiET push-button is pressed ti7strument then returns to t,'1easurement mode with th,nd available on push-buttor

takes place whe,~r the third unit.le pressure.three new units

2;

Units of Altitude Measurement

When the instrument is in altitude measurement mode,

pressing F2 changes the units of height measurement between

feet and meters. These two units are held in nonvolatile

memory.

Exit set-up, display returnsto pressure measurement

Figure 3-9 Communications set-up


l 'oN anssl ll6l-li\ll .oN ansslll6l-V-J

.AJowaw a/!Je/ol\uou U! an/el\ J/nejap al{J se

po!Jad Jno-aw!J Jsn!pe al{J saJoJs JuawnJJsu! al{l~91ON

.UO!~:Jun* a4~ (:J:JO) alqes!p o~ l:JssaJd pue uo!~:Jun* ~no-aw!~ a4~ (NO) alqeua o~ l:J ssaJd .9

.13S ssaJd .9

.po!Jad~no-aw!~ paJ!nbaJ a4~ O~ ~snfpe o~ i l:J pue J, l:J asn .v

.s5u!~~as ~no-aw!~ ~:Jalas O~ l:J ssaJd .£

..lnO-3V-JU. SMo4s au!1 sn~e~s a4~ I!~un 13S ssaJd .l.aJnssaJd 5u!Aelds!p

pue apow ~uawaJnseaw U! S! ~uawnJ~su! a4~ aJns a)!eV-J .l

.SMOIIO* se paa:JoJd

PO!A8d ~nO-8W!J. 8'1~ 6u!~snfpv

.J9l/J9{jOJ uoJJnq-l/snd jjO/UO pue 3GO/IV {jUISS9Jd Aq p9/qeslP 9q

ue.? Jno-9wIJ 9l/J 'UO Ju9WnJJsuI 9l/J {jUIl/.?JIMS u9l/M .Z'

"8POW UOIJE!JqllE!.? UI P8IqE!SIP SI uo!J.?unJ JnO-8W!J 811.1 "I

S9~ON .

8POW ,U8W8JnSe8W 0, SUJm8J pue AI8,e!p8WW! S6U!,,8S M8U

8~, S8Sn ,U8WnJ,SU! 8~, p8J8,U8 eJe sJe,eweJed e~,lle ue~M

.sJe,eweJed 5u!u!eweJ e~, ,es 0, V de,s ,eedel;j .9

.13S sseJd

ue~, pue e,eJ pneq peJ!nbeJ e~, ,:Jeles 0, l::1 pue l::1 eSn .V

.uo!,do S~~OJ e~, 5u!,:Jeles 'l::1 sseJd .£

.eu!1sme,s e~, Uo S~~OJ SMO~S Aelds!p e~,I!,un 13S sseJd .l


pue epoW ,UeWeJnSeeW U! S! ,uewnJ,SU! e~, eJnS e>le~ .l

.SM0110~ se p8e:JOJd

(6.£ a..n6I:1) s..a~awe..ed uoI~e:)lunwwo:) ell~ 6ul~~es

.i5ufJJaS SnofAajd allJ OJ JuawnjJsuf

allJ SUjn;aj uOJJnq-llsnd 3aOW allJ i5ufSSajd .,.

.nuaw

-qns allJ lIi5nojllJ daJs OJ Aa)f 13S allJ ssajd pue

nuaw-qns allJ J.?alas si5ufJJaS Juajjn.? allJ MafAaj 01 .£

.AjOWaW a/!JeIOAUOU uf i5ufJJaS

uOfJe.?funWWO.? paJsnfpe Aue SajOJS JuawnjJsuf all1 .Z'

.PIOq uf aje Juawdflls UO Jas sjaJawejed all1 .,

SB~oN

eJeMpJe~ 'eJeM,~OS '9UOU -6u!>le~SpUeH

PPO 'ue"e '9UOU -A,!Jed

l'.. -S,!q do~S

8' L -S~!q e~ea09l ~ 00£ '009 'OOll '008v '0096 '00l6l -e,eJ pne8

:sMollo~se sJe,eweJed uo!,e:J!unwwo:> l£lSI;j s8sn ,uewnJ,su! e~l

(6.£ 9..n6I:1) suoI~e:)lunww°:> lel..9S

.uo~~nq-4snd :J:JO/NO e4~ Aq ~~o pe4CJ~!MS eq AIUOueCJ ~uewnJ~su! e4~ pelqes!p S! uo!~CJun~ S!4~ ue4M .uo )jCJeq

~uewru~su! e4~ se4CJ~!MS pue ~no-eW!~ e4~ s~eseJ .UO. uo~~nq

-4snd :J:JO/NO e4~ 5u!sSeJd .pesdele ew!~ e4~ Je~~e .~~o.

~uewru~su! e4~ Se4CJ~!MS ~nO-eW!~ e4~ 'pesseJd ueeq el\e4suo~~nq-4snd ou ~! 'e~e~s pelqeue e4~ ui .(e~nu!w L ~Ine~ep)

se~nu!w 9 L pue L ueeM~eq ~es eq ueCJ po!Jed ~no-ew!~ e41

~no.ew!.L

lenuew ..asn 017L Idalenuew .l9Sn O17L Ida8Z

l 'oN anssl ll6l-li\ll .oN ansslll6l-V-J

.AJowaw a/!Je/ol\uou U! an/el\ J/nejap al{J se

po!Jad Jno-aw!J Jsn!pe al{J saJoJs JuawnJJsu! al{l~91ON

.UO!~:Jun* a4~ (:J:JO) alqes!p o~ l:JssaJd pue uo!~:Jun* ~no-aw!~ a4~ (NO) alqeua o~ l:J ssaJd .9

.13S ssaJd .9

.po!Jad~no-aw!~ paJ!nbaJ a4~ O~ ~snfpe o~ i l:J pue J, l:J asn .v

.s5u!~~as ~no-aw!~ ~:Jalas O~ l:J ssaJd .£

..lnO-3V-JU. SMo4s au!1 sn~e~s a4~ I!~un 13S ssaJd .l.aJnssaJd 5u!Aelds!p

pue apow ~uawaJnseaw U! S! ~uawnJ~su! a4~ aJns a)!eV-J .l

.SMOIIO* se paa:JoJd

PO!A8d ~nO-8W!J. 8'1~ 6u!~snfpv

.J9l/J9{jOJ uoJJnq-l/snd jjO/UO pue 3GO/IV {jUISS9Jd Aq p9/qeslP 9q

ue.? Jno-9wIJ 9l/J 'UO Ju9WnJJsuI 9l/J {jUIl/.?JIMS u9l/M .Z'

"8POW UOIJE!JqllE!.? UI P8IqE!SIP SI uo!J.?unJ JnO-8W!J 811.1 "I

S9~ON .

8POW ,U8W8JnSe8W 0, SUJm8J pue AI8,e!p8WW! S6U!,,8S M8U

8~, S8Sn ,U8WnJ,SU! 8~, p8J8,U8 eJe sJe,eweJed e~,lle ue~M

.sJe,eweJed 5u!u!eweJ e~, ,es 0, V de,s ,eedel;j .9

.13S sseJd

ue~, pue e,eJ pneq peJ!nbeJ e~, ,:Jeles 0, l::1 pue l::1 eSn .V

.uo!,do S~~OJ e~, 5u!,:Jeles 'l::1 sseJd .£

.eu!1sme,s e~, Uo S~~OJ SMO~S Aelds!p e~,I!,un 13S sseJd .l


pue epoW ,UeWeJnSeeW U! S! ,uewnJ,SU! e~, eJnS e>le~ .l

.SM0110~ se p8e:JOJd

(6.£ a..n6I:1) s..a~awe..ed uoI~e:)lunwwo:) ell~ 6ul~~es

.i5ufJJaS SnofAajd allJ OJ JuawnjJsuf

allJ SUjn;aj uOJJnq-llsnd 3aOW allJ i5ufSSajd .,.

.nuaw

-qns allJ lIi5nojllJ daJs OJ Aa)f 13S allJ ssajd pue

nuaw-qns allJ J.?alas si5ufJJaS Juajjn.? allJ MafAaj 01 .£

.AjOWaW a/!JeIOAUOU uf i5ufJJaS

uOfJe.?funWWO.? paJsnfpe Aue SajOJS JuawnjJsuf all1 .Z'

.PIOq uf aje Juawdflls UO Jas sjaJawejed all1 .,

SB~oN

eJeMpJe~ 'eJeM,~OS '9UOU -6u!>le~SpUeH

PPO 'ue"e '9UOU -A,!Jed

l'.. -S,!q do~S

8' L -S~!q e~ea09l ~ 00£ '009 'OOll '008v '0096 '00l6l -e,eJ pne8

:sMollo~se sJe,eweJed uo!,e:J!unwwo:> l£lSI;j s8sn ,uewnJ,su! e~l

(6.£ 9..n6I:1) suoI~e:)lunww°:> lel..9S

.uo~~nq-4snd :J:JO/NO e4~ Aq ~~o pe4CJ~!MS eq AIUOueCJ ~uewnJ~su! e4~ pelqes!p S! uo!~CJun~ S!4~ ue4M .uo )jCJeq

~uewru~su! e4~ se4CJ~!MS pue ~no-eW!~ e4~ s~eseJ .UO. uo~~nq

-4snd :J:JO/NO e4~ 5u!sSeJd .pesdele ew!~ e4~ Je~~e .~~o.

~uewru~su! e4~ Se4CJ~!MS ~nO-eW!~ e4~ 'pesseJd ueeq el\e4suo~~nq-4snd ou ~! 'e~e~s pelqeue e4~ ui .(e~nu!w L ~Ine~ep)

se~nu!w 9 L pue L ueeM~eq ~es eq ueCJ po!Jed ~no-ew!~ e41

~no.ew!.L

lenuew ..asn 017L Idalenuew .l9Sn O17L Ida8Z


Changing the preselected units of pressure

Proceed as follows.

1. Press the SET push-button.

2. Press F2 to select UNITS.3. Use F1 and F2 move up and down the list of units.

4. Press the SET push-button to select the required unit.

5. Repeat steps 3 and 4 to select the second and third units

Notes

"he storing of the new unitsiET push-button is pressed ti7strument then returns to t,'1easurement mode with th,nd available on push-buttor

takes place whe,~r the third unit.le pressure.three new units

2;

Units of Altitude Measurement

When the instrument is in altitude measurement mode,

pressing F2 changes the units of height measurement between

feet and meters. These two units are held in nonvolatile

memory.

Exit set-up, display returnsto pressure measurement

Figure 3-9 Communications set-up


(:!009) '090'HU!

(JaV) 'v00'H~~

baOl) 'Ol0'H~~

bav) 'v00'HU!

baOl) 'Ol0'HU!

5HU!

,~~/~ql

!sdw~e

JJO~

O'Hw

O'HW:J

O'HWW

5Hw

5HW:J

5HWW

,w/!5>1

,w:J/!5>1

ed~

ed>l

ed4

ed

Jeq

Jeqw

£~

~~

L~

O~

6L

8L

LL

9L

9L

PL

£L

~l

-L L-DL-6-8-L-9-9-v-£-l-L-a

"auf/ smeJs alfJ uo aJn/le.:/

AjfJa;1 SMolfS A/jafJq Ae/dsfP alfJ pafjfJa/I JOU j/ :9ION

lS!1 5U!M0110} e4+ WOJ} Aue 0+ e5ue4:J eq ue:J+ueweJnseew eJnsseJd }0 s+!Un ese41 !sd pue Jeqw '5HU! .eJe

+ueweJnseew eJnsseJd }0 s+!Un s,+ueWnJ+SU! e4+ 'pedd!4S

ue4M .AJOWeW el!+eIO"UOU U! Ple4 's+!un pe+:JeleSeJd eeJ4+

UeeM+eq +ueweJnseew eJnsseJd }0 s+!Un e4+ se5ue4:J l;j

5u!sseJd SepoW +ueWeJnSeeW le"el ees JO le:J°1 e4+ U! ue4M

S"Un

.eu!1 sn~e~s e4~ uo pe~de:J:JV'

Nld MeN SMO4S AI~e!Jq Aelds!p e4~ Alln~sse:J:Jns pe!~!JeA ~I .L

.AJ~ue e4~ A~!JeA O~ Nld MeUpuo:Jes e4~ 4~!M Nld MeU ~SJ!~ e4~ seJedwo:J ~uewnJ~su!

e41 .u!e5e Nld MeU e4~ Je~ue o~13S pue i l:J .J, l:J 5u!sn .9

.Nld MeU e4~ Je~ue o~ 13S pue i l:J ' J, l:J 5u!sn .9

.Nld ~ueJJn:J e4~ Je~ue o~ 13S pue i l:J .J, l:J 5u!sn .17

.Nld e4~ e5ue4:J o~ l:J sseJd .£

.eu!1 sn~e~s e4~ uo Nld SMO4S Aelds!p e4~ I!~un 13S sseJd .l


pue epow ~ueweJnseew U! S! ~uewnJ~su! e4~ eJns e)jeV\) .l

SMOIIO~ se pee:JoJd

Nld a'l~ 6u!6u8'1:>

%OOL-9L AJene8

:a/dwexa

"spueq %9ZU! eBe~ue:JJed e se UMo4S A~!:Jede:J

eBJe4:J Iln! e4~ O~ peJedwo:J eBJe4:J

A~!:Jede:J e4~ SMo4S nuew-qns S!41

AAeJJ88

.000 S! aJn.:>e}nuew .e .as N Id .Ine}apa41 .nuaw uo!.eJq!le:> a4. Bu!ssa:>:>e aJo}aq paJa.ua aq

.snw 4:>!4M 'N Id e Aq pa.:>a.oJd S! uo!.eJq!!e:> .uawnJ.su! a41

N Id MeU 8 6u!.le~U3

I.£lenuew .l9Sn 017L Idalenuew .lasn 017l Idagz

32 DPI 740 User IYlanual DPI 740 User Manual 25

Sending Measurements to a Printer or PCThe measured pressure or altitude can be sent to a printer or

PC through the RS232 communications connector. The

instrument sends the current selected measurement modedata.

3,3 Set-up Menu (Figure 3-8)

To change other less used facilities and background tasks,

enter the set-up menu by pressing the SET push-button.

Pressing SET again steps to the next sub-menu set. In each

sub-menu the function push-buttons F1 and F2 are used to

select the required task.Sending Data

Proceed as follows:

1. Set the RS232 communications parameters of the

instrument to match the device receiving the data.

2. Press SET until the display shows PRINT on the status

line.

3. Press F1 to select the PRINT menu. The display shows

the flashing message 'Ent Print Period'. This is the rate

at which measurements are transmitted by the

instrument.

4. Use F1, F2 and SET to enter the print period. Pressing

SET returns the instrument to measurement mode with

the instrument transmitting data at the selected rate.

Error Message

When an error is detected an error message is sent in the

following form:

ERRORnn -where nn is a decimal number.

Error numbers are'

041632

Bad data detected by checksum

Hardware fault

Pressure outside range

Figure 3-8 Set-up Menu


l 'oN enssl Z l6Z-~L 'oN enssl Z L6Z-~

.ele:Js-lln~ ~o %00 ~ pue 08.09 .Ov .Ol .0 ~o SleAJe~U! 6u!seeJ:Jep

ue4~ pue 6u!seeJ:Ju! ~e )j:Je4:J o~ S! eJnpe:JoJd pepuewwo:JeJ e41

.~no pe!JJe:J eq ue:J ~uew~sn!pe uo!~eJq!le:J e AJesse:Jeu ~I

.~uewru~su! e4~Jo~A:JeJn:J:Je peJ!nbeJ e4~ 4~!M peJedwo:J eq ue4~ ue:J

se:JueJe~~!p pe~snfpe e41 .pepJo:JeJ se:JueJe~~JP e4~ .(spJepue~sleuo!~eN o~ pe:JeJ~) A:JeJn:J:Je JO~ s~uew~snfpe Aue Je~~e .pue pJepue~s

eJnsseJd e 4~!M peJedwo:J eq Plno4s ~uewru~su! e4~ ~o s6u!peeJ

e41 .sleI\Je~u! ueso4:J ~e ~no pe!JJe:J eq Plno4s )j:Je4:J uo!~eJq!le:J V'

)j:)e'l:> UO!~8.1q!l8:>

.e:>!AJes UO!~eJq!le:> pe~!peJ:>:>e lSIN'peJ!nbeJ ~! 'pue el\!SUe4eJdwo:> e sJe~~o JeJn~:>e~nuew e41

.eJnpe:>oJd ~uew~snfpe uo!~eJq!le:> e ~no AJJe:> 'uo!~e:>!~!:>eds

e4~ U!4~!M ~OU S! ~UeWnJ~SU! e4~ ~o A:>eJn:>:>e e4~ ~I

.leuUosJeduo!~eJq!le:> ~uewnJ~su! pe!~!lenb Aq ~uewuoJ!l\ue pelloJ~uo:>e U! ~no pe!JJe:> eq Plno4s seJnpe:>oJd 6U!MOIIO~ e41

.A:>eJn:>:>e peJ!nbeJ e4~ ep!l\oJd o~ ~uewd!nbe

Jel!w!s JO pJepue~s eJnsseJd ~46!eMpeep pe~esuedwo:>

e S! uo!~eJq!le:> JO~ ~uewd!nbe pepuewwo:>eJ e41

.s4~uOW Z l AJel\e pe)j:>e4:>

S! ~! ~e4~ pepuewwo:>eJ S! ~! e~eJn:>:>e Ae~s o~ ~uewnJ~su! e4~J°:J .e~e:>!~!~e:> uo!~eJq!le:> e 4~!M pe!lddns S! ~uewru~su! e41

NOI.LYII81'Y:) t'

££lenuew .lasn 017L Idalenuew .lasn OtlL IdatoZ

DPI 740 User Manual 2334

~ Procedure (Figure 3-10)

This sub-menu divides into two selections. a one-point

calibration and a two-point calibration.

CAUTION: THiS INSTRUMENT CONTAINS STATIC SENSITIVE

COMPONENTS HANDLE WITH EXTREME CARE.

A The calibration procedure is protected by a PINand the GAL option link LK1 located on the PGB.To carry out a calibration LK1 must be in the II'

position.

Viewing the Maximum and Minimum

Proceed as follows.

1 .Make sure the instrument is in measurement mode and

displaying pressure.2. Press F1 to enter the instrument menu.

3. Press F1 to view process options.

4. Press F2 until the status line shows MAXIMIN.

5. Press F1 to view maxImin options.

6. Select MAX (F1) or MIN (F2) the status line shows the

recorded value.

7. Press F1 then F2 to switch off either the maximum or

minimum value. Press F1 twice to view the other maximum

or minimum value.!/R1§: The MaxiMin options must be re-se!ected after

changing to another measurement mode.

"""'- ~ .' "P~" -~"...

--SET

-With the instrument connected toan appropriate pressure standard.access the calibration sub-menuthrough the set-up menu.

One-Qoint calibrationFor the one-point calibration the instrument stores therelationship between pressure and output.

Important noteThe calibration carried out at manufacture is a twO-POI/7tcalibration against a pressure standard traceable to NationalStandards. Carrying out a one-point calibration cansignificantly downgrade the instrument's accuracy if in doubtconsult the manufacturer before proceeding.

Two-goint calibration

This calibration provides a more accurate reading of the

applied pressure, the instrument calculating a more complex

correction for the displayed reading.


l 'oN enssl ll6l-~

UOI}e.lqlle:> Ol--E 9.1n61.inuaw NIW/X"f/W L-t a..n6!.i

lenuew .lasn 017L Idazz


Switching the Filter ON or OFF

To switch the filter on proceed as follows:


displaying pressure.2. Press F1 to enter the instrument menu.3. Press F1 to enter view process options.4. Press F2 to view the next option (FILTER).5. Press F1 to view the filter options.6. Press F1 to switch filter on or F2 to switch filter off.~: When the filter is switched on, the display

shows the = symbol.

MAXIMINIn normal measurement mode the maximin measurements

are recorded as a background task. The store is reset when

the instrument is switched on or can be reset at any time.

Two-point calibration

Proceed as follows.


displaying pressure.

2. Press SET until the display shows GAL on the status line.

3. Press F1 to select the GAL menu.

4. Use F1, F2 and SET to enter the PIN.

5. Press F2 to select a two point calibration, the displayprompts for the first calibration point.

6. Adjust the pressure standard for the first calibration

point.

7. Use F1 t and F2 J. to set the first calibration value.

8. When the pressure is stable press SET to enter the firstcalibration point. The display prompts for the secondcalibration point.

9. Repeat steps 5 to 7 for the second calibration point.

10. Press F1 to accept the calibration values, the displayprompts for the calibration date.

11. Use F1 t and F2 ~ to set the calibration date.

M-2912 Issue No.1

l 'oN enssl ~l6~-V'Ij

jJO P8l/.?JfMS Ju8wnjJsuf 8l/J l/JfM p8jOJSUfeW8j pue 81IJeIO/1UOU 8je Sj8J8Wejed j8JlfJ 8l/.L :B"IiW"

.esn JOt ApeeJ pue peJo~s s6u!~~es Je~l!t MeU

e4~ 4~!M epow ~ueWeJnseeW O~ ~UeWnJ~SU! e4~ SUJn~eJ 13S

6u!sSeJd .enleA 3VIJU e4~ Je~ue o~ 9 pue 17 sde~s ~eedelj .9

.enleA peJ!nbeJ e4~ SMo4s Aelds!p e4~ ue4M 13S sseJd .g

.enleA ON\t8 e4~ ~es o~ "' Z:J pue i l:J esn .17

.s6u!~~es lj31ll:J ~:Jeles o~ Z:J sseJd .£."lj31ll:J NlVIJ/X\tVIJ" SMO4S eU!1 sn~e~s puee:J!M~13S sseJd .Z


pue epow ~ueweJnseew U! S! ~uewnJ~su! e4~ eJns e)jeVIJ .l

.SMOIIOt se pee:JoJd

'!JodeJnsseJd e4~ U! s!Jqep ou S! eJe4~ ~B4~ eJns e)jBlIIJ .~ueBJe~ep

PI!W pUB 4~ol:> eeJ~-~u!1 dWBp B 4~!M ~!Un e4~ ~o eSB:> e4~ uBelJ

6U!UR91:> E"S

, J!edeJ JOt ~ue6e JO JeJn~:)etnuew

e4~ o~ ~uewnJ~su! e4~ uJn~e!,j 'HOHH3 W3.1SAS SMO4S

Aelds!p e4~ pe~dnJJo:) sewo:)eq uo!~eJedo s,~uewnJ~SU!e4~ JO je:)npsueJ~ e4~ to dn-~es JO uo!~eJq!le:) e4~ ti

.no seo6 e6essew JoJJe e4! I!!un eJnsseJd

pe!ldde e4! e:Jnpe!:J .HOHH3 39NWH3AO e6essew

e4! se4sel~ Aerds!p e4! enlel\ eJnsseJd ele:Js-lln~ e4! ~o

%0 II spee:Jxe !uewnJ!su! e4! Aq pesues eJnsseJd e4! ~I "

s86esS8W ..0 e peAelds!(]

6u!pu!l Jlne:f z.s

"BU!UBel:J pUB Bu!pu!t ~lnBt'~ueWe:JBldeJ AJe~~Bq O~ pe~!W!1 si ~iun S!4~ uo e:Jueue~u!ew JeSn

IB.lQUQ9 ...9

Q:)ueuQ~u!ew 9

l£lenuew .l9Sn 017l Idalenuew .lasn OtlL Idaoz


Figure 3-6 Process sub-menu

M-2912 Issue No.1

L 'oN enssl l L6l-V-J

.peAeldsfP eq OJ [jufpeej elqeJs e pue

pe/1fe:Jej eq OJ eldwes el/J jOj peMolle eq Jsnwew!J l/[jnoue 'dn-jeMOd Je e/1!J:Je sf jeJI!J el/J pue

e[jjel sf eldwes el/J uf JueJsuo:J ew!J el/J uel/M BION

las aq

Pln04s 3VIJl1 pue aN'\t8 }0 sJa~aweJed OM~ a4~ .UO 6u!4:J~!MS

aJO}a8 .SapoW ~uawaJnseaw aaJ4~ lie U! s~uawaJnseaw

lie o~ pa!ldde S! Ja~I!} ssed Mol a4~ Uo pa4:J~!MS ua4M

.le~l!:t

.aJe~ alqes!p o~ l:J JO aJe~ alqeua o~ l:J ssaJd .9

.sUo!~do aJe~ a4~ Ma!" o~ u!e6e l:J ssaJd .v

.sUo!~do ssa:JOJd a4~ Ma!" o~ l:J ssaJd .£

.nuaw ~uawnJ~su! a4~ Ja~ua o~ l:J ssaJd .l

.paJe~ aq o~

~uawaJnseaw a4~ ~:Jalas o~ uo~~nq-4snd 3aOVIJ a4~ ssaJd .l

.SM0110} se paa:JOJd .UO!~:JUn} aJe~ a4~ alqes!p

pue alqeua 01 .10qwAs e.lR~ a4~ sa4sel} Aelds!p a4~ .palqeua

S! UO!~:JUn} eJe~ e4~ ua4M .s~ueweJnseaw ~uenbesqns

lie WOJ} enle" paJnseew AI~UesaJd a4~ s~:JeJ~qns UO!~:JUn}

eJe~ a41 ."peJe~" Allenp!"!pu! eq ue:J ~ueweJnseew 4:Je3

e.lR.l

.p8~Joddns ~OU 8JB 5U!)jB4SPUB4

8JBM~~OS pUB 8JBMpJBH .8:>!A8P ~X8U 84~ ~o 8U!18A!8:>8J 84~ o~

p8~:>8UUO:> 8:>!A8P 8UO ~O 8U!1 ~!WSUBJ~ 84~ 4~!M 5u!J B ~O S~S!SUO:>

)jJOM~8U 841 .(66 o~ 0) SS8JppB 8nb!un B SB4 8:>!A8P 4:>B8

.S8:>!A8P ~O )jJOM~8U B O~U! p8~:>8UUO:> 8q UB:> ~U8WnJ~SU! 841

8pOW p8SS8.1ppy

.p8J!nb8J S! 5U!SS8JppB ou lj~!M J8~ndwo:>

IOJ~UO:> B O~ AI~:>8J!P p8~:>8UUO:> 8q UB:> ~U8WnJ~SU! 8UO

8pOW ~:)8.1la

.B58WO ~:>B~UO:> UO!~BWJO~U! J84~Jn~ JO~ .p8q!J:>S8p

pUB P81!B~8P 8JB ~U8WnJ~SU! 84~ o~ AlddB ~B4~ SpUBWWO:>

84~ UO!~:>8S S!4~ ui .(lJnO) 8:>B~J8~UI UO!~B:>!UnWWoJ

IBSJ8A!Un B58WO 84~ S! ~U8WnJ~SU! 84~ Aq p8Sn IO:>O~oJd

SUO!~B:>!UnWWo:> 841 .8pOW p8SS8JppB 84~ U! ')jJOM~8U B ~O

~jBd se jO epow ~:Jej!p U! Je4~!e pesn eq ue:J ~uewnj~su! e41

uo!~onpo.l~ul ...9

SUO!~e:)!Unww°:) 9

u!w/xell\J "

J8~1!:J "

8Je1

"SAeM 5U!MOIIO~

84~ U! S~lnS8J ~U8W8JnSe8W 84~ ss8:>OJd ue:> ~U8WnJ~SU! 841

(9-£ 9.1n6!~) S~U9W9.1nSe9W 6U!SS9:)O.ld

6£lenuew .l9Sn 017L Idalenuew JaSn 017L Ida81.


6.2 General Command Format

The instrument is controlled by a sequence of letter codes,

some commands require numeric values to follow the letters.

The correct number of parameters must be sent for the

particular command. The instrument accepts upper-case or

lower-case letters.

Commands should be in the form:

< sta rt> d d ssxx: < CS > <term i nator>

where

<start> is the start of a command block indicator that canbe * or # character, The * character causes all command

block data to be echoed around the network, The # character

suppresses the echoing of the data block and can be used for

commands such as AA -automatic addressing.dd is a two digit destination address 00 to 99

ss is a two digit source address 00 to 99

xx is a two character command, This can be followed

by additional data, a number can be added to this commandto select a channel.

<CS> is a block checksum and takes the form' NN

where NN is a two digit checksum that is the modulo lOO sum

of all the ASCII codes of the character in the string including

the ':',

Entering a Pressure Datum for Altitude Measurement

The instrument stores the pressure datum used in altitude

measurement in volatile memory with a default value of 29.92

inHg. To enter a new pressure datum proceed as follows.

1. Press the MODE push-button to select altitude

measurement mode (confirmed by the display showing

'ALTITUDE' on the status line).2. Press F1 to show the measurement menu.

3. Press F2 to change the altitude settings by selecting

'SET-ALT".4. Press F1 if the datum required is the ISA. To enter any

other datum press F2.

5. Press either F1, F2 or SET to allow the datum to be

entered (the display stops flashing).

6. Use F1 to increase the datum value and F2 to decrease

the datum value.

N!lt#-: Pressing and holding either Ft or F2 changes thevalue at a fast rate. Pressing and holding MODE

and either Ft or F2 accelerates this fast rate.

7. When the datum value is correct press SET, the display

returns to altitude measurement corrected using the new

pressure datum.

N!lt#-: Pressing the MODE push-button steps menu

back one setting, allowing a value to be

corrected.~. This checksum feature can be disabled sothat the instrument does not usechecksums, in which case the checksummust not be sent. When the checksumfeature is enablea; commands are onlyinterpreted if the checksum is correct. Anerror IS reported if an incorrect checksum isreceived.

<terminator><CR><LF:

is the string termination characters

d=J10066i

.eJnsseJd 6u!Jnseew S! leuue4:> ~ndu! e4~ ~e4~ se~e:>!pu!

66 ~uewnJ~su! o~ 00 ~uewru~su! WOJf ~ues AldeJ 6U!MOIIOf e41

<Jo~eu!wJe~><sJ>xxSSPPi

.pe~eJdJe~u! ~ou pue >lJOM~eUe4~ punoJ peo4:>e eJe Se!lde~ .~ueJeff!p S! Jo~e:>!pu! ~Je~s e4~

~de:>xe uJe~~ed Jel!w!s e MOIIOf s~uewru~su! e4~ WOJf Se!lde~.lleuue4:>~ndu! uo

Je~eweJed e4~ JOf 00 ~uewru~su! se~e6oJJe~u! puewwo:> S!41

<:Jl><~J>(JI6600#

Jusws.lnsesw Spm!JI~ 5-£ s.ln6!.i

5HU! Z6.6Z o~ ~Inelep

epn~!~le

U) eJe~ o~ e~eln:Jle:J

se5ue4:J ~:J 5u!sseJd o~ pesn

\eJnsseJd wn~ep

/

SJeleW pue lee!ueeMjeq

dels 01 ~.:J sseJd

-epnj!lle !0 SI!Un

...,LJ

a/dwexa.puewwo:> e4~ o~ Je~:>eJe4:> ( e4~ 6u!ppe Aq pe!Jenb

eq ue:> e~ep .s~uewnJ~su! o~ spuewwo:> 6u!pues o~ Uo!~!ppe ui

A~!I!~8J A.leno

.6HU! ~o s~!uneJnsseJd ~:>eles pue eJnsseJd eJnseew o~ leuue4:> ~ndu! dn

-~es o~ 00 ~uewnJ~su! o~ 66 ~uewru~su! Aq ~ues puewwo:> S!41

<:Jl><I:!J>9l=nl:d=JI6600#

301-1111

1;;;:11

~

e.l8i

8{dweX8:p8Sn 8q ue:J ,:, JO~eJed8S puewwo:J 841

<:Jl><!:1J>9l=nld=JI6600#

a/dwexa

.puewwo:J 4:Jea 4~!M ~uas aq O~ aAe4 ~ou Op SaSSaJppe a:JJnos

pue UO!~eU!~Sap a4~ se Ja~sueJ~ e~ep ~ua!:J!~~a aJow e sMolle

5!41 .~a>l:Jed e~ep e U! Ja4~a6o~ pa6u!J~s aq ue:J spuewwoJ

.paJou6! S! puewwo:J a4~ JO pa~aJdJa~u! S! puewwo:J

a4~ sa4:J~ew S!4~ ~I .ssaJppe s.~uawnJ~SU! a4~ ~su!e6e JO 66

ssaJppe leqol6 a4~Jo~ pa>l:Ja4:J S! ssaJppe uo!~eu!~sap paA!a:JaJa4~ sJa~:JeJe4:J uo!~eu!wJa~ a4~ 6U!A!a:>aJ UO .,#, e S! Ja~:>eJe4:>

>I:J°lq puewwo:J a4~ ssalun ~uawnJ~su! ~xau a4~ o~ uo pao4:Ja

AI~Ue~SU! aJe Aa4~ ~uawnJ~su! a4~Aq paA!a:JaJ aJe sJa~:>eJe4:J sV

.s~uawru~su!lie Aq paz!u6o:JaJ ssaJppe leqol6 e S! 66 ssaJppe a41

lUeWeJnseew *0 eW!. e4. .e eJnsseJd pUnoJf5 Ple!*J!e

JO eJnsseJd leAel ees enJ. se 4:)ns Jesn e4. Aq peJ!nbeJ JO

UMOU'i Wmep eJnsseJd pe!*!:)eds e eq ue:) wmep S!41 .nuew

Il"\f-13S e4. Aq peJe.ue eq ue:) wmep eJnsseJd peu!*ep

Jesn"\f .(Jeqw 9Z.£ lO l) f5HU! Z6.6Z '"\fSI e4. S! wmep eJnsseJd

.lneJcep e41 .v86l :66l 9Z S8 U! peu!*ep selqe. eJe4dsoW.epJepue.s O"\fJI 0. f5U!pJO:):)e eJnsseJd le:)°1 WOJ* pe.eln:)le:)

eJe epm!.le *0 s.ueWeJnSee~ .Wmep eJnsseJd :)!*!:)eds e pue

leAel e UeeM.eq e:)ue.S!p le:)!.JeA e4. SeJnSeeW epoW S!41

(9-E e.ln6!.i) ~UeWe.lnS8ew epn~!~IY

lenuew ..esn 017L Ida91. lenuew .lasn OvL Ida 1.17


example program

#sa?; query instrument address!SA=OO; reply address is 00#fa=1; put instrument in addressed mode#0099ic=p; send command to instrument 00 from

instrument 99 input channel is pressure#0099pc=-(ir.1 0.1 ); set-up process channel to filter

.input reading ir time constant 10. band l'#0099iu=16; units to psi#0099pr?; get reading from process channel!9900PR1 =14.318; reply of pressure in psi (filtered reading)#0099ir?; get unfiltered reading!9900IR=14.318; reply of pressure in psi#0099iu=18 units to inHg#0099pr?; get reading from process channel!9900PR1 =29.152; filtered pressure reading in inHg#0099fa=0; take OFF addressed#iu?; query units!iu=18; units = 18 = inHg (see table 6-1)

This example is reproduced using OBASIC in Table 6-3.

The instrument stores the local height and temperature dataused in the sea level pressure measurement in nonvolatilememory. To enter this data proceed as follows:

1. Press the MODE push-button to select sea level pressuremeasurement mode (confirmed by the display showing 'Sea'on the status line).2. Press F1 to show the measurement menu.3. Press F2 selecting the SET-OFF parameter (confirmedby the display flashing 'Enter Height ASL ').4. Press either F1. F2 or SET to allow the height to beentered (the display stops flashing).5. Use F1 to increase the height value and F2 to decreasethe height value.N.D.l#.: Pressing and holding either Fl or F2 changes the

value at a fast rate. Pressing and holding MODEand either Fl or F2 accelerates this fast rate.

6. When the height is correct press SET. the display changesto flash 'Enter Temp'.7. Repeat steps 4, 5 and 6 to enter the temperature value.The display returns to sea level pressure measurement.corrected using the new height and temperature data.

N-9-t#.: Pressing the MODE push-button steps menuback one setting, allowing a value to becorrected.

M-2912 Issue No.

B~ep UO!~eJq!leJ aJ

~Joqe UO!~eJq!le:) X:)

~dB:>:>e UO!~eJq!le:) 'v':)

.pbBJ s~u!od uo!~eJq!le:> Jo .ou ~B~ IN:)

~u!od uo!~eJq!le:> JB~U3 [<BJn~eJBdwB~>'I<BnleA>=d:)

BdA~ uo!~eJq!le:> AJ!:>BdS <BdA~ le:»= I:)

SpU8WWO:) UOp8Aq!l8:)

S~!Un Jeln5BJ dn-~BS <XBPU! S~!Un>=Uns

SSBJppe ~UBWnJ~SU! ~BS <UU>='v'S

SpU8WWO:) dn-1.9S 1.U9WnA1.SUI

SBnleA WnW!U!W

pue wnW!XeW ssB:>OJd ~BSB~ ~d

5U!peBJ SSB:>oJd

Jo 5U!PUBS :>!~ewo~ne Blqeu3 ,,= 'v'd

5U!peBJ ssB:>oJd ~B~ l ~d

Bpn~!~le <BnleA>'(~I)'v'= :)d

:1:10 <BnleA>'<BnleA>'(~I)O= :)d

wnw!u!w (~1)<= :)d

wnw!xew (~1»= :)d

<BnleA>'(~I)1 = :)d

BJe~ (~I)l=:)d

JB~I!J <BnleA>'<BnleA>'(~I)-= Jd

SSB:>OJd dn-~BS <UO!~!U!JBP ssB:>oJd>= :)d

SpU8WWO:) SS9:)OAd

5u!peeJ

~ndu! Jo 5U!PUBS :>!~ewo~ne elqeu3 "='v'1

(l-9 Blqe~ BBS) S~!Un ~ndu! dn-~es <XBpU!>=nl

5U!peBJ ~ndu! ~B~ l~1

~ndu! dn-~es <BdA~ weJed>=JI

SpU8WWO:) Jndul

."U!I

le!Jes e4~ 5u!sn pewJoJled eq ue:> Suo!~:>unJ 5U!MOIIOJ e41

AA8WWns pU8WWO:) £.9

Juawa.lnseaw laAal eas ~-£ a.ln6!.i

.::>0 U! eJmeJedwe~ J!e le:>ol e4~ pue (epow epn~!~le U! pe~:>eless~!un) ~ee! JO SJe~ew U! lellel ees elloqe ~46!e4 ueew eJe

sJo~:>e! uo!~:>eJJo:> OM~ e41 .pe~:>eles S! (:1:10) .8S ue4M enlelleJnsseJd e4~ ~:>eJJo:> O~ AJowew el!~elolluou U! peJo~s u!eweJ

pue e~!s Jeln:>!~Jed e JO! peJe~ue eJe sJo~:>e! uo!~:>eJJo:> ese41

.~.p 8Jn~.J8dw8~ pu. ~'16!8'1 1.001 6U!~~8S

uoIJ:JaJJo:J e JnoqJIM .:/.:/0 jO al\lJel\lJap e SI HNO :BfON

.eJmeJedwe~ J!e le:>ol e4~ pue lel\el ees el\oqe ~45!e4

le:>ol e4~ uo peseq enlel\ pe~eln:>le:> e S! pue lel\el ees ueew

~e eJnsseJd :>!J~ewoJeq ~o (::1::10) uo!~e~ueseJd le:>!5oI0JOe~ewe4~ S! ~I .eJnsseJd lel\el ees e4~ seJnseew epow S!41

(17-£ a.ln6!:I) ~uewe.lnseaw (:1:10) leAe, ees

lenuew .lasn °"L Ida171. lenuew JeSn Ot7L Ida £11


Local (QFE) Measurement (Figure 3-3)

This is the direct measurement of the absolute pressure

sensed at the pressure port. In addition to measuring local

pressure the instrument can, with the use of a hose and a

connector, measure absolute pressure at a system test point.

PIN commands

PP=<pin> PIN protect commandAutomatic Commands

AA=<device address> Automatic device addressAE=<error mask> Automatic error reporting

(see table 6-1)

Read Commands

RB? Read battery volts

RI? Read instrument type and version

numberR E ? Read error status (see table 6-1 )

Protocol Format Commands

FC=<flag> Enable/disable message checksum

FA=<flag> Enable/disable addressed mode

Key Commands

KM=<flag> Front panel key-pad operating modeunits of measurement -

press F2 to change

between three units.

Figure 3-3 Local pressure measurement


measurement mode -

pressing F1 changes

to tare (T)

L .oN enssl Z L6Z-iI"'J

nuew epow ~ueweJnseew z-£ eJn5!.i

:AJeno

c."m

r-O on £ > -

(")+-r- "'~(":;;\

~ ~~

§"" m"'

"puewwo:J AIUO AJenb e S! S!41

C=I:JI '"fj'8) sJlun p8J:J818S, Ut b'utpe8J 8L{J SI <8nle/1> :8J8L{M

9nle/I>=1:J1 S811d8J JU8UJnJJSUt 8L{1

iI:JI"'6, 8fdw!?)

:uo!~d!J:>sea 5u!peeJ e JO! ~senbe'd

leWJ°:l:pUBWWO;)

L\:!I

6u!pee.l .ndu! .89 -III

= Jndl.

d=;p

, -n-n

~ "'

(0

I'''\I:;;\ (/) ~

(I) \::)m(O~ L I;:j\ I J~i@\!~ I @~» ~

~~ § ~

"" 8"' m

fwex

oC/!:AJeno

~

-~ 1

-~:o ~IS'\ 8

.11~ ~m"'., 0 "'

+-(!)-m ~~ +- -iP. "' ' -.~ (:;;'\ ~ rn' ~..~ -i

,; ~ t +-I~ +-

~ II rn "' ~~ o rn ~~ ~" C; 0 ~!.(j) ~ ~ ..i o :io m "' ~.. ." -,-I -.rn

~ ~

"n"'

.Je~eUJeJed

pe~:>eles AI~UeJJn:> e4~ ~o uo!~e5oJJe~u! e4~

sMOlle pueUJUJo:> AJenb 5u!puodseJJo:> e41

.JuawnJJsu!S!IIJ JoJ d aJnssaJd asn AluO :8j1jJV

~ndu! eJn~eJedUJe~ 1

~ndu! e5e~lol\ !\

~ndu! ~ueJJn:> I

~ndu! eJnsseJd d:5U!MOIIO~ e4~ ~o Aue eq ue:> <ed~ UJeJed>

.pueJnseeUJ e4~ se!~!:>eds J, xepu! e4~ .<edA~

UJeJed> Je~eUJeJed eJnseeUJ O~ ~ndu! dn-~es

"'C'~

:UO!~d!J:JS8a>~ 5~ ...-I ~C 01C 5.m

<edA" weJed>=JI .eWJ°:!

~ndu! dn-~es -:>1 :pu8WWO:>

spU8WWO~ ~ndul

.leUO!"do eJe [ ] U! pesol:Jua

sJa"aweJed .A"!Jel:J JO} paAOWaJ uaaq aAe4 sJa":JeJe4:>

5u!"eu!wJa" pue "Je"s a4" Uo!"d!J:Jsap pUeWWO:J 5U!MO110}a4" UI .l.9 U! paq!J:Jsap "eWJO} a4" }0 aJe spUeWWO:J 1I"v'

~9S pu8WWO:> ~.9

DPI 740 User Manual 11IU -Set-up input units

Format: IU=<index>

Description: Set-up the units for the input in volatile

storage. The units are specified as <index>.

defined in Table 6-2.

A query of this command returns the index

units.

IU?Reply. IU = <index>

Example:

Command:

a reply of IU= 78 means units are ir)Hg

IA- Enable automatic sending of input

reading

Format: IA = k

Description: Enables automatic sending of input reading.The value 'k' corresponds to 'send every'k'th conversion'. If 'k' is 0. the automaticsend feature is disabled.

Example: IA = 10

send a value every lOth conversion.IA = 0

disable the automatic feature.

3 Operation

3.1 General (Figure 3-1)

The instrument is switched on by the ON/OFF push-button

and powers up in the last selected mode and units of

measurement. The instrument "times-out" after a period of

one minute if no push-button selections are made. To keep

the instrument in the powered-up state the ON/OFF and

MODE push-buttons should be pressed together. The display

briefly shows a "Time-out Disabled' message. Pressing the

MODE push-button steps through the three pressure

measurement modes. Pressing the SET push-button steps

through the set-up menu (described in 3.3).

3.2 Measurement Modes (Figure 3-1)

Selecting the MODE push-button, changes the measurement

mode between:

Local (OFE unprocessed pressure at the pressure port).

Sea (OFF calculated pressure at sea level).

Altitude (calculated height from pressure datum).

Selecting the push-button F2 changes the units of pressure

measurement, continuous pressing steps between three pre-selected units, the display shows the units for each

measurement mode.low passtilter- r~ JE -f'IL

,;; v=odoa:oJdJo~obbattery---condition

/ 'selectedselected 16 character unitsmode ::=-0 ~status line F1 SET \J--- function

function selection seiectlon

9 ~ Set-up menus

mode seiection ON/OFF control

Figure 3-1 Instrument front panel

:-xamp/e

A query responds with an integer of theautomatic send interval in conversions.

IA?Reply: IA = 10


l oN enssl ll6l-V\jl .oN enssl ~ l6~-~

.JeJ/Ij

JuewnJJSU! /ewJOU elfJ J:Jejje JOU seop JeJ/!j S!lf.L :B1ON

'<pUBq> pUB <!UB!SUO:J

8W!!> 84! 6u!6uB4:J 6U!PB8J !ndu! J8!1!} 8U!}8a

( lO"O'9 l.O'~I)-=Jd

.le~l!. -:9ldlwex3

SUO!~!U!.9P SS9:)O.ld

(e!nu!w l) pelqeue

000 (X) pelqes!p (,..) pelqeue !sd 'Jeqw '6HU!

~no-ew!l

Nld

( l)!l) )jU!1 uo!~ejq!leJ

(l)!l) )jU!1 f5u!f5jelj:> Aje~~e8

(l:l Aq pe~:>eleS)

~uewejnseew ejnssejd to S~!Un

sf5u!~~es ~uewru~sul 8 UO!~aO

(e~nu!w ,) pelqeue

000 (X) pelqes!p (X) pelqes!p !sd 'Jeqw '6HU!

~no-ew!l

Nld

( l)ll) )jU!1 uo!~ejq!leJ

(l>ll) )jU!1 6u!6je4:> AJe~~e8

(l:J Aq pe~:>eleS)

~uewejnseew ejnssejd ~o S~!Un

sBu!~~es ~uewnJ~sui pjepue~s

:8IqB~ fiU!MOIIOl 84~U! UMO45 ~BWJOl 84~ U! 8q ~5nW <UO!~!U!l8P558:JOJd> 841 .~U8WnJ~5U! 84~ lo 558:JOJd

p8J!nb8J 84~ 58U!l8P pUB 5~85 pUBWWO:J 5!41:uo!~d!J:Jsea

<UOI~!U!t8p ss8:JOJd> = Jd .~ewJo:J

sse:)o.ld dn-Jes -:»d :pueww°:»

spuewwo:) ssa,:)o.ld

s5u!~~es 5U!MOIIO~ e~~ ~~!M pedd!~s S! ~uewnj~su! e~l

S6U!~~8S IR!~!UI £"Z

lenuew J9Sn O~~~ Idalenuew JaSn 011L IdaO~


~

Example:pr=.-IIR\

Example:PC=>(IR)

Example:

Example:

T tare

PC= T(IR)

Full tare of input reading.

PC= TOR,1 00.00)

Define tare of input reading, subtracts 100

from reading. The value specified in the

command is in the currently selected units.

This tares the value but does not change

the displayed value.

< minimum

Defines the minimum value of the input


command.

> maximum

Defines the maximum value of the input


command.

O OFF

PC=OOR,200,20)

Define the derived OFF input value changing

both the <height> and <temp> parameters.

A altitude {also see command PA)

PC=AOR,120.00)

Define the derived ALTITUDE input value

changing the current or default setting of

<datum pressure> to 120.00.

Figure 2-3 Adaptor/charger connector


l 'oN enssl ~ l6~-~

IO!J:)QUUO:) le:)!JJ:)QI3 z-z QJn6!.i

"PUBWWO:J AJenb 6u!puodseJJo:J ou S! eJe41

"SenIBf\ 4~oq6u!~~eseJ ~:Jeffe U! '6U!pBeJ ~UeJJn:J e4~ O~

IBnbe SenlBf\ WnW!U!W pUB WnW!XBW s~es

VIJd

:AJano

:UO!~d!J:JS8a

:~ewJo:J

:pueww°:>

:a/dwex3

:AJeno

(,<,pue ,>, puewwo:J Jd ees oslel

Senl81\ WnW!U!W

pu8 WnW!X8W ssaooJd sJaseH -Wd

OL = t/d :A/dal:1

tt/d

.suo!sJe"uo:> U! le"Je~u! pues :>!~ewo~ne

e4~ fo Je6e~u! ue 4~!M spuodseJ Nenb \f

.aJmeaj :JfJewoJne al/J a/qesfP O = 'r1'd

.uofsJal\uo:J l/JOL AJal\a an/el\ puas

OL = 'r1'd

.pelqes!p S! eJn~eef pues

:>!~ewo~ne e4~ .0 S! ,Jt, fl .,uo!sJe"uo:> 4~,Jt,

AJe"e pues, O~ spuodseJJo:> ,Jt, enle" e41

.6u!peeJ ~ndu! fo 6u!pues :>!~ewo~ne selqeu3

Jt = \fd

6U!p8eJ

Jo 6ulPuas °!JewoJne alqeu3 -'tfd

fj'Huf uf fj'ufpeaJ

:a/dwex3

:uo!~d!J:Jsea

:~ewJo:J

:pueww°:»

£9"6t' = YO :A/day

tYO

'puewwo:J AIUO AJenb e S! S!41

"5u!peeJ e4~ s~senbeI:J

(I:Jd

6u!pea.l ~a9 -lid

:a/dweX3

:AJeno

:uo!~d!J:>sea

.~ewJo:J

:pu8WW°=>

6t7lenuew .l9Sn 017L Idalenuew JeSn 017L Ida8


R$232 connections

Option C is the adaptor cable recommended for use with the

RS232 serial communication interface. The adaptor cable

has, at one end, 6-pin LEMO type connector and, at the other,

a 9-way D type connector. The instrument's serial

communication settings and the data terminal equipment

(DTE) settings must be the same. The recommended initial

settings are as follows:

Baud rate 9600

Data bits 8

Stop bits 1

Parity none

Handshaking none

Adaptor Cable

I Flow I Function I Pin No. -1-Pin No.

TxDRTSGND

CTSRxD

3

7

5

8

2

2

4

7

5

3

Pin No. Function

1 RxD input f-2 CTS input f-3 GND (screen) H4 not used5 RTS output -t6 TxD output -t

Set-up commands

Command: SA- Set instrument address

Format" SA = <nn>

Description: Set instrument address to <nn>" Changes

the network address of the instrument in the

range O to 98. Address 99 is used for global

commands,

Example: SA= 10 sets instrument address to 10

Query' SA? query instrument address

Reply" SA=10

Command: SU- Set-up "regular" unitsFormat: SUn = <units index>

Description: Selects the pressure units that appear as

default selection F2 in measurement mode,

Both required parameters must be specified

i.e" the push-button sequence n (1, 2 or 3)

and the <units index>.

Example: SU1= 16 sets first units (1) to psi

SU2= 18 sets second units (2) to inHg

Query" The corresponding query command returns

the index to the pressure units selected for

the specified option,

SU1?

Reply: SUn=<units index>

SU1=16

~

,. The function column for the D type connector usesRS232 terminology with respect to DTE.

2. In the D-type connector DTR and DSR should beconnected together as follows:

9-way pin 4 and 625-way pin 20 and 6

3. The instrument's sen81 communication settings canbe changed using the set-up menu.

M-2912 Issue No.1

'oN enssl Z L6Z-V\J'oN enssl Z l6Z-~

.5u!se:J JO~:Jeuuo:J Je~no -el\+

.u!d Je~ue:J -el\-

:JO~:Jeuuo:J u!d Je~ue:J .(UJUJ g.~) .L .0 .elod-OM~ e S! S!41

Je6Je4:J Ne~~e8

.ApoqJe5Je4:Je4~ 0~u04sndpue

Jo~depe ~ueUJe:JeldeJ e4~ u5!le .Apoq Je5Je4:J e4~ UJOJ~ Jo~depee4~ 4snd Jo~depe u!d JeMod e4~ e5ue4:J 01 .ep!MPIJOM

pesn eq ue:J ~!Un e4~ ~e4~ os SJO~:Jeuuo:J elqee5ue4:JJe~U!

~o ~es e 4~!M pe!lddns S! Je5Je4:J/Jo~depe leUo!~do e41

(E-Z puez-z e..n61.i)

suoIJ:)euuo:) le:)!..J:)913 Z.Z

A.la~~eB a4~ 6u!~~!:t L-Z a.ln6!:t

.pUeWWO:> dJ e4! 5u!sn .s!!un pe!:>elesAI!UeJJn:> e4! U! enle" pe!ldde e4! !ues eq !snw !uewnJ!su!e41 .sez!l!qe1s eJnsseJd e41 ue4M .eJnpe:>oJd e41 e1eldwo:>

01 peJe!Ue eq !SnW S1U!Od UO!1eJq!le:> e4! 410q .eJnsseJd

UO!1eJq!le:> !0 UO!1e:>!ldde e41 JO! ApeeJ MOU S! 1UeWnJ1SU! e41

~ = lJ :Alde~

edA1 UO!1eJq!le:> AJenb llJ

.SSeJ50Jd U! Uo!!eJq!le:> !0 edA!

e41 SUJmeJ llJ J~1eWeJed S!41 !0 AJenb 'i/ :AJeno

uoIJejqlle:J 8ult{:JJeW JUlod OMJ wjoJjadt = 1.:J :aldwex3

uo!~eJq!le:J5u!4:J~ew ~U!od OM~ ~ = <edA:lle:J>

.P!leA SeWO:Jeq

pUeWWO:J S!4~ eJO!eq epoW uo!~eJq!le:JU! eq ~snw ~uewnJ~su! e41 .pewJOlJed

eq o~ uo!~eJq!le:J !0 edA~ e4~ A!!:)eds :uo!~d!J:)sea

<edA~ le:» = 1:) :~eWJ°::1

adAJ UO!J8Aq!18~ Aj!~eds -.L:) :pU8WWO:)

.s5u!peeJ ~uenbesqns lie o~ UO!~:JeJJO:)u!e5 pue ~eS!!O ue se~eln:)le:) eJeM~!OS e41 .seweJ~Xe

5u!~eJedo e4~ U!4~!M pe!ldde eq o~ seJnsseJd 0M1 seJ!nbeJ

eu!~nOJ uo!~eJq!le:) e41 .e:)!Aep e4~ !0 ~nd~no e4~ Uo uo!~eJq!le:)

~U!od OM~ e wJOlJed o~ JeSn e4~ sMO11e pUeWWO:) S!41

Uo!~eJq!le:) JeSn -:)

spuewwo:t UO!~eAq!le:)

4--~~<b

~---:

MeJ:JS

el\!~de:J~I

I.~lenuew .l9Sn Ot7L Idalenuew .lasn OtrL Ida9


Command:

Format:

Description:

Query"

CP -Enter Calibration PointCP = <value>

The calibration point value is given by <value>

in the currently selected units.

A query of this parameter CP? returns the

number of calibration points already recorded

by this command. The instrument also

indicates that it is ready for the next

calibration point.

Reply:

exampleCP = O no cal points

recordedCP=2 2 cat points

recorded

After entering all the points required to calibrate the instrument,

the accept calibration command CA must be sent to update

the data in the instrument's nonvolatile memory.

2 Installation

WARNING:DO NOT ATTEMPT TO CHARGE NON-RECHARGEABLEBATTERIES. TO PREVENT ACCIDENTAL CHARGING OF NON-RECHARGEABLE BATTERIES THE CHARGE LINK LK2 MUST BEIN THE DISABLED POSITION (X).

CAUTION:

Do NOT LEAVE OISCHARGEO BATTERIES IN THE INSTRUMENT.

OLD BATTERIES CAN LEAK AND CAUSE CORROSION.

WHEN FITTING THE BATTERIES MAKE SURE THE ELECTRICAL

CONTACTS ARE CLEAN AND OBSERVE THE CORRECT POLARnY.

N!lJ#-: For further information. refer to the safety page

at the front of this manual and to the battery

manufacturer.

2.1 Battery (Figure 2-1)

Three batteries are fitted in the battery compartment.

For non rechargeable batteries make sure the charging link

LK2 is fitted in the disabled positibn (X).

For rechargeable batteries make sure the charging link LK2

is fitted in the enabled position (,1).

N!lJ#-: The charging link LK2 is located on the

instrument PCB. To access th,s link remove the

top case assembly.

To replace the batteries, unscrew the captive screw and slide

off the battery compartment cover. Make sure the polarity of

the new batteries is correct.

If the battery capacity is low the display shows:

" The battery symbol (approximately 1 hour left).

" The flashing message Battery Very Low for 15 to 20

minutes.

" The message Batteries Dead! followed, after a short

time, Switching Off!! the instrument then

automatically switches off

M-2912 Issue No.1


uoIJe.lqlle:J J.loqe X.JfjHuI Z'6.g a.lnssa.ld pallddE? Z'6.g = d.J

uoIJE?lqllE?:J JUlod OMJ w.l°J.lad t = 1.J

apow uoIJE?lqlle:J oJuIJuawn.lJsuI sJnd ;oa.laJua Nld E:Z't = dd

fjHuI SE? JndUI dn-Jas 8t = nl

.eJnpe:JoJd uo!~eJq!le:J e4~ s~oq'V

XJI.IOq8 UO!~8..q!l8:> -X:>


.epow ~ueweJnseewo~ SUJn~eJ ~uewnJ~su! e41 .AJowew

el!~elo/\uou s,~uewnJ~su! e4~ U! peJo~spue pe~eln:Jle:J eJe s~ue!:J!ffeo:J uo!~eJq!le:J

e4~ ue4~ puewwo:J dJ e4~ 4~!M peJe~Ue

ueeq e/\e4 s~u!od uo!~eJq!le:J fo Jeqwnu~:JeJJo:J e4~ fl .e~ep pe~eJq!le:J e4~ s~de:J:J'V

'VJ~deooy UO!~8..q!l8:> .y:>

puewwo:J AIUO AJenb e S! S!41

SJUlod uoIJE?lqllE?:JZ' pUE? t UaaMJaq Sajlnba.l Z" t =N.J

:eldw!?x3

:uo!~d!J:>sea

.~ewJo:J

:pu8WW°:>

ase:> ~!sueJl a

.adA~ a AeM-6pJepue~s o~ OL"J3l u!d-9 a4~ 5u!~:>auuo:> l£lS~ J°:J

alqe:> Jo~OepV' J

"AJeno

'i:)e! JeMod leUO!~eUJe~UI

UO!!:JeuuoJ

(wnw!xew) '1W 008 'Ja I\ II~nd~no :uo!~d!J:Jsaa

.~ewJo:J

:pUBWWO:)

AJano

zH 99-L17 "\tA 0 l (leU!WOU) .J'\t A 017~ 0+ 00 l

(N:JuoIJeJqlle:; JUlod OMJ wJoJJad t = 1:J

apow uoIJeJqlle:; oJuIJuawnJJsuI sJnd paJaJua Nld E:Zt = dd

Isd se JndUI dn-Jas 9t = /71

.8jnp8:>Ojd UO!~ejq!le:> P8!t!:>8dsa4~ ~no AJje:> o~ p8j!nb8j s~u!od uo!~ejq!le:>

wnw!xew pue wnw!u!w 84~ SUjn~8!:1

(NJ

JeMOd leuJe~x3

Je6Je4:J/Jo~dep'11

Je5Je4:J/JO~aepe JeMOa pue Se!Je~~eq peJ!N 8

(Jeqw 9 L .o~) 6HU! vOO.O~ (J 00£ O~ 00 L) :J o0L O~ o0v to e6ueJ e4~ Jel\o

A:JeJn:J:Je :J!J~ewoJeq pe:Jue4u3 'V'

suo!~dO

"ese:J 6u!AJJeJ '!!!

'e~e:J!~!~Je:J uo!~eJq!leJ "!!

(uO!~e:J!lqnd S!4~) OOZ'v'>llenuew J8Sn "!

:8/dweX3

:uo!"d!J:Jsea

:"ewJo:JS8!JOSS8:J:JV'

.5U!MOIIO~ 84~ 4~!M p8J81\!18P S! ~U8WnJ~SU! 841

suo!JdO pUR S9!.lOSS9:J:JV Z" ..pa.l!nba.l s~u!od

uo!~e.lq!le:J Jo .laqwnu ~a9 .N:> :pueww°:>

lenuew .lasn OtrL Ida £9lenuew .lQSn OtlL Idato


Command:

Format:

Description:

CD- Calibration dateCD = <dd/mm/yy>

Sets calibration date, only valid in calibrationmode.

CD = 24/01/98set cat date to 24 January 1998

CD? query date of last calibration.Reply: CD = 24/01/97

Specification (contd)

DisplayRead-out 999999 LCD digits, 0.535' (13.6 mm) high

with additional 16 text characters

Overload indicationError code flashing

Response

Resolution

'xample:at nominal11 0% FS

Querynominal 2 readings/second

0.001 inHg (e.g., 1.034 inHg a)Example of a two point calibration

IV = 18 set-up input as inHg

PP = 123 PIN entered put instrumentinto calibration mode

CT = 1 perform two point calibration

Electrical Power SupplyBatteries 3 x 1.5 V alkaline size AA

Connections

external power adaptor/charger

.International power jack

6-way LEMO typeRS232 serial communications

Electrical safety

This instrument meets:

CP = 23.62 applied pressure 23.62 inHg

CP =32.48 applied pressure 32.48 inHg

CA calibration accepted

CD calibration date

""""""""""" BS EN 61010 as applicable

Electromagnetic compatibilityThis instrument meets"

..EN50081-1 (emissions)

...EN50082-1 (immunity)

rJes necessitatesContinuing development somespecification changes.

Command:

Format:

Description:

PP -PIN protectionPP = <pin>

This command is used to change the PIN ofthe instrument which is used to protect thecalibration data and configuration.<pin> = 123 calibration PIN code

pp = 123Example:

instrumen

PIN entered ;;

Query:into calibration mode

There is no corresponding query command.

M-2912 Issue No.1

l 'oN enssl ll6l-~"ON enssl ll6l-VIJ

eJnsseJd 6U!)jJOM eteS wnw!xe~(e Jeqw 9L£P)

e 6HU! 6l L (e Jeqw oog£ o~ g£)

e6HU!OOLO~L (e Jeqw 0O9l o~ g£)

e 6HU! 9L o~ L (e Jeqw OO£l o~ g£)

e 6HU! 8£ o~ L

'AJeno

"a/dwex3

.)jsewjOjje e4~ ~o e5ew! ~!q e4~ o~ 5u!puodsejjo:>

enleA lew!:>epexe4 e 4~!M spuodsej AJenb 'V

..lo.l.la A.taJ\a.lOj paJ.loda.l S! .lo.l.la ue .:1.:1.:1.:1 = 31f

paJe.lauafj S! .lo.l.la xeJuAse UalfM paJ.loda.l S! .lo.l.la ue tOOO = 31f

.jojje e4~ jeel:> O~ penss! eq ~snw

puewwo:> l3~ e41 .~!q jojje e4~ jeel:>

~OU seop esuodsej jojje :>!~ewo~ne u'V

.l-9 elqe 1 U! peu!~ep S! <)jsew jojje>

.Alle:>!~eWo~neS! e5essew jojje .3~" e4~ 'Sjn:>:>o jojje e4~ ~I

.~es ~! uo pe~:>e eq O~ sjojje ~o e5ew! ~!q e4~

seu!~ep <)jsew jOjje>enleA Oew!:>epexe4) ~!q9l'V .5u!~jodaj jojja selqeue puewwo:> S!41

<)jsew jojje> = 3'V

6u!J.lod9J JOJJe :J!JewoJny -3Y

'Se5UBJ el\!+BUJe+IB

"8TON(e Jeqw 09 L L o~ 09L)

e 5HU! v£ o~ II (:J!J~ewoJeq) e5ue~

JeeA/wdd 00 L> A~!I!qe~s

S:J % gvO.O+ b009+ O~ 0 L -) :Jo0l L o~ og L ~o e5ueJ e4~ Jel\o

S:J % £0.0+ (J o0v O~ 00) :J090 L + o~ ol£ ~O e5ueJ e4~ Jel\o

S:J % lO.O+ (J 00£ O~ 00 L) :Jo0L + O~ oo9 ~O e5ueJ e4~ Jel\o

.A~!I!qe~eedeJ pue s!seJe~sA4 .A~!JeeU!I-UON

A:JeJn:J:J';f

5u!~~!~ eso4 P/! (ww v) .L9 L .0 JO

P/O (WW 9) ,,9£l.0 Jo~:JeuuoJ

e..nssa..d

(v9dl) v ';f~3N pJepue~s 5u!lees

u!seJ Axode pue lee~s sselu!e~s .uo:J!I!S

.xeJAd 4~!M elq!~edwo:J se5 Au';f

(J o0L+ O~ o0v-) :J 009L+ O~ o0v- (J009+ O~00L-) :J 00lL+ o~09L

:uo!~d!J:Jsea

.~ewJo:J

:puewwo:)

:Wn!p8W 8JnSS8Jd

85BJO!S

5U!!BJ8dO

.8JmBJ8dw81

18/U9WUOA!AU3

.pUelUlUO:J S!4' JO~ AJanb oU S! aJa41 .AJano

.Zt pue t t 'Ot sesse-,ppe Juewn-,Jsuf

el/J sJes puewwo.? sfl/J 'Jf-'OMJeU

el/J uf sJuewn-,Jsuf ee-,l/J l/JfM

Ot = 'tf'tf :e/dweX3

.sassaJppefju!seaJ:Ju! Alle!,uanbas 0, )jJOM,aU

a4, U! S,UalUnJ,SU! a4, ~o SaSSaJppe a4, s,as

Alle:J!,elUO,ne ,I .)j:J°lq Japea4 pUelUlUO:J#a4, 4,IM pasn aq AIUO ue:J pUelUlUO:J S!41 :uo!,d!J:Jsaa

<SSaJppe a:J!"ap> = W lelUJ°:J

6ulsSa..pp8 :)!~8WO~nv -VV :pu8WW°:>

spU8WWO:) :)!~eWO~nv

(WW 9£) .l17' l = 41,d8p'(Ww 06) .179'£ = 41,P!M (ww 06l) .817'L = 1,45!84 ,,"' 8Z!S

(5>! 9'0) sqll'O ..".",.,"',"""""",.,""',.,',.,' (leu!wou) '1,45!8M

suo!suew!a

uo!~e:)!l!:)ads

99lenuew J9Sn 017L IdalenuelAl .lesn O~L Idaz


Read Battery Volts

1 Introduction

The Omega DPI 740 precision pressure indicator uses asilicon resonant pressure transducer producing a pressurereading in units of pressure measurement and altitude.The instrument is contained in a molded enclosure of acomposite ABS material and can be used as a hand-heldindicator or. using a retractable stand. as a bench instrument.The instrument can also communicate. through a serial RS232connector. with a compatible computer system or printer.

RB?

Read battery voltage

RB? query battery voltage

Reply:RB= <voltage>RB = 3.9 battery 3.9 volts

There is a query only command.Query:

RI - Read instrument type andversion number

Format'

Description:

Query'

RI?

Read device equipment. this returns theinstrument type on the network includingthe version of the code, in the form:RI = <string>where: the string is in the format:

'DPlnnn,Vm.mm'nn = instrument typem.mm = version and issue number

RI? query instrument version andissue number

RI = DP1740, V1.10

There is a query only command.

Figure 1-1 General view

M-2912 Issue No.1

l .oN anssl Z l6Z-~

'puewwo:J AIUO AJenb e S! eJe41:AJano

"jJodeJJsel a.:Jufs 'SjOjja ou 0000 = 3l:1

sjojja s,/Jodaj t!3l:1 :aldwex3

:JewjoJ attJ uf sf fjufjJS attJ :ajattM

.pajOu6:1aJe spuewwo.:J jattJo 11\;f "JuawnJJsuf attJ

OJ Juas spuewwo.:J joJ Jas AIUO aje SjOjj3 :BjOKf

.L .9 elqel U! peu!!ep eJe sepo:J JoJJe e41

.peJeel:J eJe SJOJJe lie pueUJUJo:J

S!4! 5u!nss! Je!!'lt .peJJn:J:Jo JoJJe e4! !!

!es pue (xeUJ S!!q 9 L) S!!q se peJo!s eJe SJOJJe

e41 .pueUJUJo:J l3H !sel e4! e:Ju!s JoJJe Aues!JodeJ pueUJUJo:J AJenb S!41 .sJoJJe !JodeH :uo!!d!J:Jsea

l3H :!eUJJ°:JSn~8~S ..0 9 P89H -~H :pU8WWO:)

Lslenuew JaSn Ot7L Ida!!Alenuew .lesn Ot-L Ida

58 DPI 740 User Manual vi DPI 740 User Manual

page

...39

...39

...40

...42

...44

...44

...46

...49

...50

...54

...55

...57

...58

Protocol format commands

Command: FC -Enable/disable message

checksumFormat: FC=<fiag>

Description: Format checksum command. Enables/

disables the checksum feature of the data

transactions.<flag> = O disable checksum feature

1 enable checksum feature

Examp/e: FC = O disab/e checksum feature

FC = 1 enable checksum feature

Query. There is no corresponding query command.

Command: FA -Enable/disable addressed

modeFormat FA=<fiag>

Description. Format addressing mode command.

Enables/disables the addressed modefeature of the data transactions. When

addressed mode is disabled. one to one

communication (direct mode) is assumed.<flag> = O disable addressed mode

1 enable addressed modeExamp/e: FA = O disab/e addressed mode

FA = 1 enable addressed mode

Query: There is no corresponding query command.

Table of Contents (contd)

title

6 Communications ..." " , "' , "'.."

6.1 Introduction , "'..." ,.,..." " "..."".."

6,2 General Command Format .." , " "'.

6,3 Command Summary "' "..."' ,,...""..""

6.4 Command Set "...""..""..."' ' " "' '

Input Commands ""..."' "' , " " ,.

Process Commands , ", " " , , Set-up Commands ."...""..."' " " " '

Calibration ComrtJands .." " " " "..

Automatic Commands , " "'..." "..."..

Read Commands ..."'..."".."' "'..."'..." '

Protocol Format Commands ,..." ,,'..." ,

Key Commands .." "'..." "'..."' "..."

Table of Illustrations

page

1

6

8

9

11

12

13

14

16

19

22

25

30

34

fig. title

1-1 General view 2-1 Fitting the battery 2-2 Electrical connections 2-3 Adaptor/charger connector 3-1 Instrument front 'panel 3-2 Measurement mode menu 3-3 Local pressure measurement

3-4 Sea level measurement 3-5 Altitude measurement 3-6 Process sub-menu 3-7 MaxiMin menu 3-8 Set-up menu 3-9 Communications set-up 3-10 Calibration

M-2912 Issue No.1

l "ON anssl ll6l-~

LE

LE

LE

LE

Bu!UeelJ £.g.Bu!pu!! ~lne:J z.g

leJeue':) l.9e:>ueue~u!el/lJ 9

££££

>I:J6ljJ UO!~eJq!leJUO!~eJq!leJv

Jd JO Je1.u!Jd e 01. S1.ueWeJnSeel/lJ 5u!pues

Nld MeU e 5u!Je1.U3

SUO!1.e:JIUnWWOJ le!Jes

1.no-ew!l

S1.! U n

AJe1.1.e8

nuel/lJ dn-1.es £.£

u!l/IJ/xel/lJ

Je1.I!::1

eJ e 1

s1.ueweJnseel/lJ 5U!SSe:JOJd

1.ueWeJnSeel/lJ epm!1.I'v'

1.UeWeJnSeelAJ (::1::10) leAel ees

1.ueweJnseel/lJ (3::10) le:J°1

sepol/lJ 1.UeweJnSeel/lJ l.£

I eJ e U e ~ l .£

uo!1.eJedo £

Z£

~£

6Z

8Z

gz

gz

gz

~Z

8~

8~

8~

g~

v~

£~

~ ~

~ ~

~ ~

(apOW a~OWaJ U! 5u!~eJado) ~=V.J)iJO

(apow le:J°I U! 5u!~eJado) 1=V.J)i :Alda~

apow 5u!~eJado AJanb lV.J)i

s5u!~~es le!~!ul £.~

suo!~:Jeuuo:) le:J!J~:JeI3 ~.~

AJe~~e8 L .~

uo!~elle~sul ~

OL

9

9

9

suo!~dO pUB Se!JOSse:>:>\f ~. L

uO!~e:J!l!:>eds L. L

uo!~:>npoJ~ui L

el~!~

17 ...

Z ...

~ ...

e6ed

.sme~sa~OWaJ/le:JOI a4~ SUJn~aJ puewwo:J AJanb a41 .AJano

(pe/q6'SIP suOJJnq-l/snd)epoW eJOWeJ;; = W)/

(pe/q6'Ue SUOJJnq-l/snd)epoW /6'.?0/7 = W)/ :e/dw6'X3

.suo~~nq-4snd a4~ s'l:JoiUn/s'l:J°I puewwo:JS!41 .Ala~OWaJ pa~eJado aq ue:J ~uawru~su!a4~ ~e4~ os apow uo~~nq-4snd a4~ s~as :uo!~d!J:Jsaa

<5el~>=~)! :~ewJo:fapow 6u!~e.lado a~OWa.l/IB:JO' -W>I :pUBWWO:)

spuewwo:J Aa>lSJU9JUO:> 10 9lqe.l6~lenuew ..asn Oto£ IdaAlenuew .lasn 011£ Ida

60 DPI 740 User Manual iv DPI 740 User Manual

Abbreviations continuedTable 6-1

Table of Error Definitions

The 16-bit hexadecimal mask defined below can be specified

using the AE command. It is used for automatic error

reporting by the RE message transmitted by the instrument.

PCB

ppm

psiOFE

OFFBit Error

0 syntax error

parameter errorONH

RPT

RTS

RS232

Rx

Tx

V

VA

oC

of

configurationerror

printed circuit board

parts per million

pound per square inch

barometric pressure at airfield level (local)

calculated sea level pressure including air

temperaturecalculated sea level pressure

resonant pressure transducer

ready to send

Serial data communication standard

receive

transmit

Volt

Volt amp

degrees Celsius

degrees Fahrenheit

address error

checksumerror

Symbols

calibrationerror

sequence error

The following symbols are used to identify hazards on

this instrument.

Description

Set if the command syntax was not understood

Set if the parameters in the command were out ofrange or not valid

The configuration parameters can only be changedif the configuration PI N is sent with the commandsIf the PIN is not sent or is incorrect this error is

reported

An invalid address packet was received

The received command checksum did not matchwith the calculated checksum With this error,the command is not executed and this error

reported

An error occurred while trying to zero a measurand,

probably because the zero offset is too large

Error in the instrument's calibration procedure;not enough calibration points

A valid command was received, but can not be

processed because the instrument was not in thecorrect state to execute command

This command was not available on thisinstrumenc

Reading outside range

Static sensitive components handle with

extreme care.8 command notavailable

9 range error

10 reserved

11 reserved

12 reserved

13 reserved

14 reserved

15 reserved

&This symbol, on the instrument, indicates

that the user should refer to the user

manual.


l "ON enssl ~l6~-LI\J

le:Jsed edJe~ewe!p ep!S~no p/o

Wn!Wpe:J le>l:Jlu peJ !N

~IO"!II!W I\wle:Jsed e5ew ed~

AJn:JJew fO Je~eW 5HWAJn:JJew fO Je~ew!ll!w 5HWW

Je~ew!II!W wwe~nlOsqe Jeq!II!W e Jeqw

Jeq!ll!w Jeqw

eJedw'1 !11!W '1w

Aelds!p le~sAJ:J P!nb!1 aJl~OOf eJenbs Jed e:JJOf punod ,~f/fql

le:Jsed 01!>1 ed>lJe~ew eJenbs Jed e:JJOf WeJ501!>1 ,W/f5>1

Je~ew!~ue:J eJenbs Jed e:JJOf WeJ501!>1 ,W:J/f5>1

WeJ501!>1 5>1eJe4dsoW~e pJepUe~S leUO!~eUJe~UI '1S1

Je~eM fO 4:JU! O'HU!AJn:JJew fO 4:JU! 5HU!

Je~ewe!p ep!su! p/!Uo!~es!ue5JO Uo!~e!,,'1I!"!J leUO!~eUJe~UI O'1JI

z~JeH zHle:Jsed 0~:Je4 ed4

ele:Js-llnf S:JJe~eM fO ~eef O'H~f

e:JefJe~ul Uo!~e:J!UnWWOJ lesJe,,!Un >I:JnJa IJna

~uewd!nbe leu!wJe~ e~ep 31a

~uewd!nbe 5u!~eu!wJe~ ~!n:JJ!:J e~ep 3Ja

~ueJJn:J ~:JeJ!p Ja

pues o~ Jeel:J SIJAJn:JJew fO Je~eW!~ue:J 5HW:J

pJepue~s 4S!~!J8 S8

eJe4dsoW~e w~eeueJA~s eue!pe~nq el!J~!UOIAJ:Je S8'1

.leJnld pue jeln6u!s a41 U! awes a41 aJe SUO!le!AaJqqV' :e~oN

.Ienuew S!4~ U! pesn eJe SUo!~e!"eJqqe 5U!M0110f e41

suoIJelA9.1qqy

~ee~SJe~ew

(:!009) '090'HU!

(JoV) 'V00'H~~

(Jo0Z) 'OZ0lH~~

(JoV) 'v00'HU!

(Jo0Z) 'OZ0'HU!

5HU!

l~~/~ql

!sdw~e

JJO~

O'Hw

O'HW:>

O'HwW

5HW

5HW:>

5HwW

,w/~5)j

lw:>/~5)j

edlt'.J

ed)j

ed4

ed

Jeq

Jeqw

lLOL

-�l-ll-Ll-Ol-6L-8L-LL-9L-9L-vL-�L-lL-L L-OL-6-8-L-9-9-v-�-l-L-a

'SpUBWWO:J ns pUB nl 84~ Aq p8Sn 8JB pUB Mol8q P8U!~8P8JB ~U8W8JnSB8W ~O S~!Un 84~ IIB Af!~U8P! o~ p8Sn <X8pu!> 841

S~!Un ~U8W8.1nSeaw JO 8lqe.L

z-g 8lqe.L

1.9lenuew J9Sn O~L Ida!!!lenuew ..asn 017£ Ida

62 DPI 740 User M,8nual ii DPI 740 User Manual

Table 6-3

Example Program in QBASICBattery Safety

This instrument is fitted with three size AA batteries either

rechargeable (nickel cadmium) or non-rechargeable

(alkaline).

Before storing this instrument remove the batteries

When fitting batteries make sure the electrical contacts are

clean and observe the correct polarity.

The battery compartment should be inspected for

corrosion caused by leaking batteries. Corrosion must beremoved using approved methods*.

When storing and transporting batteries make sure that

they cannot be short circuited. A short circuited battery

can become very hot and can, in certain circumstances,

explode. It is recommended that a suitable container is

used for storing and transporting batteries.

Dispose of old batteries using a safe, approved method.*

*Refer to the Battery Manufacturer for this information.

Software Version

This manual contains operating instructions for instruments

with software version 1.XX. Further changes to the

instrument's software may require a change to the operatinginstructions and an issue number change of the manual.

start:

EOFch=26

CLS

port%=1PRINT SPC(20); 'DPI 740 Omega Universal Communi(;ations

Interface: Example Program' PRINT SPC (19);

PRINTPRINT Before commencing, ensure that the DPI 740Communications Parameters are set as follows"'PRINTPRINT 'Baudrate : 9600, Parity" None, Handshaking" None,Databits " 8, Stop bits " l'

PRINTPRINT 'The PC serial comms port used is COM";PRINT port%PRINTPRINT 'Please note DOS File Name" Pressure Readings will beLogged in this File'PRINTINPUT Nm$PRINT

PRINT'Ready'PRINT" Press <CTRL><BREAK> to exit'PRINT 'Starting communications'OPEN Nm$ FOR OUTPUT AS #2IF port% = 2 THEN

OPEN 'COM2"9600,N,8,1,RS,RB6000. FOR RANDOM AS #1ELSE

OPEN 'COM2"9600,N,8, 1,RS,RB6000' FOR RANDOM AS #1END IFPRINT "Comm port opened OK'

a$="PRINT#1, "#sa?" + CHR$(13);PRINT #2, '#sa?' + CHR$(13) + CHR$(10);

GOSUB GetReply

address$=RIGHT$(a$,4)address$= LEFT$(address$,2)

M-2912 Issue No.1

N~nI3~

$e'l# INI~d

(OL)$~HJ=$q lllNn dOOl

$q+$e=$e

(L#'L)$lndNI=$q

.uo!~e:J!}!:Jeds ~:JnpoJde4~ U! pUno} eq Aew spJepue~s pe!ldde }0 Sl!e~ep ~

) Je41Jn:l .sell!~:)eJ!p J33 ~UelleleJ e4~ }0 s~ueweJ!nbeJ ~

UO!~:Je~oJd le!~UeSSe e4~ s~eew ~:JnpoJd S!41

oa...=$e:Aldetj~e~

aN3Z#3S01:)l#3S01:)

Aldetj~e~ 8nSO~.(0 l)$tjH:)+(� l)$tjHJ + .In!#. .Z# lNltjd

.(�l)$!:1HJ + .In!#. .l# lNl!:1d:(0 l)$!:1H:)+(� l)$!:1H:) + .o=e~. + .66. + $sseJppe + .#. 'Z# lNl!:1d

.(�l)$!:1HJ + .0=e~.+.66. + $sseJppe + .#. .l# lNl!:1d

:(�l)$!:1HJ+.6HU!.=$eJnsseJd+. S! Aea e4~ ~o eJnSseJd.1NI!:1d(8 .$eJnsseJd)$l::131 =$eJnsseJd

(Ol.$e)$lH~I!:1=$eJnsseJdAlde!:1~e~ 8nSO~

.(0 l)$!:1HJ+(� l)$!:1H:) + .lJd. + .66. + $sseJppe + .#. 'Z# lNl!:1d:(�l)$tjHJ + .Vd"+.66" + $sseJppe + .#. .l# lNl!:1d

:(Ol)$!:1H:)+(�l)$tjH:) + .8l=n!.+.66. + $sseJppe + .#. 'Z# lNl!:1d:(�l)$!:1HJ + .8l=n!.+.66. + $sseJppe + .#. .l# lNl!:1d

Alde!:1~e~ 8nSO~'(Ol)$!:1HJ+(�l)$!:1HJ + .V!.+.66. + $sseJppe + .#. 'Z# lNl!:1d

.(�l)$tjH:) + .V!.+"66. + $sseJppe+ .#. .l#lNI!:1d

:(�l)$!:1H:)+.!sd.=$eJnsseJd+. S! Aea e4~ ~o eJnSSeJd.1NI!:1d

(8.$eJ nsseJd)$l::131 =$eJnsseJd(0 l.$e)$lH~I!:1=$eJnsseJd

Aldetj~e~ 8nSO~.(Ol)$tjHJ+(�l)$tjHJ + .Vd.+.66. + $sseJppe + .#. 'Z# lNltjd

:(�l)$!:1H:) + .Vd"+.66" + $sseJppe + .#. .l# lNl!:1d:(Ol)$!:1H:)+(�l)$!:1HJ + .9l=n!.+.66. + $sseJppe + .#. 'Z# lNl!:1d

:(�l)$!:1HJ + .9l=n!.+.66. + $sseJppe + .#. .l# lNl!:1d:(Ol)$tjHJ+(�l)$tjHJ + .(l.Ol.J!)-=:Jd"+"66. + $sseJppe + .#. 'Z# lNltjd

:(£l)$~H:) + .(l.Ol.J!)-=:Jd.+.66. + $sseJppe + .#. .l# lNI~d

:(Ol)$!:1H:)+(�l)$~H:) + .d=:J!.+.66. + $sseJppe + .#. 'Z# lNI~d:(�l)$!:1H:) + .d=:J!.+.66. + $sseJppe + .#. .l# lNl!:1d

:(Ol)$!:1H:)+ (�L)$tjHJ + .l=e!#. 'Z# lNltjd

:(�l)$!:1H:) +.l=e~#. .l#lNI!:1d

.~UeLUnJ~SU! S!4~ Uo eSJno:J 5u!u!en e4~ pe~eldLUO:J"lln~SSe:J:Jns

pue ~ue5e pe~u!odde JO JeJn~:Je~nUeLU e4~ "q ue/\!5 eSJno:J

5u!u!eJ~ ~:JnpoJd e pepue..e e/\e4 ~SnLU uosJed pe!~!lenb V

.lenUeLU S!4~ ~o JeeJ e4~ ~e ~S!I e4~ o~ Je~eJ AJe!P!sqnsJO ~ue5e ' JeJn~:Je~nUeLU e4~ ~:Je~UO:J e:J!/\pe le:J!u4:Je~ J°:J

8~!Apy 18~!uLl~e.L

.s~ueLU~Jedep e:J!/\JeS S,JeJn~:Je~nUeLU e4~ JO s~ue5e

e:J!"Jes peZ!J04~ne "q ~no pe!JJe:J eq Pln04s pue SeJnpe:JOJd

s,JeJn~:Je~nuew e4~ 5u!sn peu!e~u!ew eq ~snw ~uewnJ~su! e41

e~U8Ue/U!8W

.~uewnJ~su! S!4~ U! pesn sle!Je~ew :J!XO~ UMOU)j oU eJe eJe41

SI8!..e/8W ~!X°.L

.~uewnJ~su! e4~ O~ eJnsseJd

5U!)jJOM a~es wnw!xew e4~ ue4~Je~eeJ5 eJnsseJd "Idde ~OU oa

e..nsse..d

.uo!~e:J!lqnd S!4~ U! SaJnpe:JOJd lIe JO~a:J!~:JeJd 5u!Jaeu!5ue p005 pue laUUOSJad *pe!~!lenb esn o

.e5ewep JO AJnrU! WOJ~ ~uewd!nbe e4~ pue

Jesn e4~ 1:Je~oJd 01 penSS! SUO!1ne:J JO S5U!UJeM Je41!e eJe

SUO!1:>nJ1SU! "~e~es e41 .UO!1!PUO:> e~es e U! 1uewnJ1SU! e4~

u!e~u!ew 01 pue Uo!~eJedo 8~eS JO~ peMO110~ eq 1SnW ~e41SUO!~:>nJ~SU! "~e~es pue 5u!~eJedo SU!e~UO:> Uo!~e:>!lqnd S!41 o

.pe~e1s ~e4~ ue4~

esodJndJe4~0"UeJO~1ueWnJ1SU! S!41eSn10U oa .Ienuew

S!41 U! pel!e1ep SeJnpe:>oJd e41 5u!sn pe~eJedo Ue4M e~es

eq 01 1uewnJ1SU! S!41 peu5!sep se4 JeJm:>e~nuew e4l

A~ej8S

lenuew JaSn 017L Ida

~lenuew .lasn 017L Ida £9

Date post:	10-Jul-2020
Category:	Documents
Upload:	others
View:	14 times
Download:	1 times

DPI 740 User Manual M-2912 · DPI 740 Precision Pressure Indicator User Manual M-2912 @ Omege...

Documents