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
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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)
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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.
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58 DPI 740 User Manual vi DPI 740 User Manual
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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
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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
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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
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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
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50 DPI 740 User Manual DPI 740 User Manual 7
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
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9DPI 740 User Manual
~
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
reading. To reset this value use PM
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
M-2912 Issue No.1 M-2912 Issue No.1
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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
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44 DPI 740 User Manual DPI 740 User Manual 13
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
M-2912 Issue No.1M-2912 Issue No.1
measurement mode -
pressing F1 changes
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42 DPI 740 User Manual
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.
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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
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38 DPI 740 User Mlanual DPI 740 User Manual 19
Figure 3-6 Process sub-menu
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36 DPI 740 User Manual DPI 740 User Manual 21
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.
1. Make sure the instrument is in measurement mode and
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.
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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.
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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
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30 DPI 740 User Manual DPI 740 User Manual 27
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
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30 DPI 740 User Manual DPI 740 User Manual 27
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
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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
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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.
M-2912 Issue No.1 M-2912 Issue No.1
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36 DPI 740 User Manual DPI 740 User Manual 21
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.
1. Make sure the instrument is in measurement mode and
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
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38 DPI 740 User Mlanual DPI 740 User Manual 19
Figure 3-6 Process sub-menu
M-2912 Issue No.1
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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
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42 DPI 740 User Manual
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.
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44 DPI 740 User Manual DPI 740 User Manual 13
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
M-2912 Issue No.1M-2912 Issue No.1
measurement mode -
pressing F1 changes
to tare (T)
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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
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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
reading. To reset this value use PM
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
M-2912 Issue No.1 M-2912 Issue No.1
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50 DPI 740 User Manual DPI 740 User Manual 7
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
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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
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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.
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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
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58 DPI 740 User Manual vi DPI 740 User Manual
page
...39
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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
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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.
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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)
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