MX421 High Precision GPS/DGPS Sensor Installation Manual · MX421 High Precision GPS Sensor...

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InstallationManual

MX421 High Precision GPS/DGPS Sensor

MX421 High Precision GPS Sensor

INSTALLATION MANUAL

Models Covered:

MX421MX421B

MX421-10MX421B-10

MX Marine.23868 Hawthorne Blvd., Suite 201

Torrance, CA 90505-5908U.S.A.

www.mx-marine.com

P/N 723594 Rev. D

April, 2004By: GTD

MX Marine

MX Marine reserves the right to make changes to its products and specificationswithout notice.

How To Contact Us?

Contact your local Leica dealer for:• Installation, Service, & Technical Support• Sales of Accessories• Hardware and Software Upgrades

Unlike many other consumer electronics industries which only sell consumer elec-tronic devices, your marine dealer is often your best advisor for installation andservice of your new GPS receiver. MX Marine strongly encourages you to utilize theknowledge and experience of your sales and service dealer.

Should you need to contact us directly for new sales, upgrades, repair service, ortechnical support, we can be reached at the following:

International:MX Marine, Leica Geosystems (USA)23868 Hawthorne Blvd., Suite 201Torrance, California 90505USA

+1-310-791-8213 Telephone (International)+1-310-791-6108 Fax

[email protected]

In Europe:MX Marine, Leica Geosystems (UK)Ocean QuaySouthamptonSO14 5QYUnited Kingdom

Phone: +44 (2380) 33-99-22Fax: +44 (2380) 33-03-45

This page was left blank intentionally.

Table of Contents

Introduction .................................................................................................... 1MX421 Operation ........................................................................................... 2

Antenna Connector ................................................................................... 3Supplied Equipment ...................................................................................... 4MX421 Mounting Guidelines ......................................................................... 6Installation Procedure .................................................................................... 6Antenna Mounting ......................................................................................... 6

Bracket Mount........................................................................................... 6Surface Mount........................................................................................... 6

Figure 2 - MX421 Bracket Mount ......................................................... 7Figure 3 - MX421 Surface Mount ......................................................... 7

MX421 Installation Section ............................................................................ 9Power Requirement ................................................................................. 10MX421 Connector Configuration ............................................................. 11

Figure 4 - Interface Cable Pin Configuration for MX421..................... 11MX421B Connector Configuration .......................................................... 12

Figure 5 - Interface Cable Configuration for MX421B ....................... 12Data Interface to MK40 Chartplotter ........................................................ 13

Figure 6 - MX421 Interface to the MK40 Chartplotter ......................... 13Data Interface to PC or Non-Leica Navigation Systems .......................... 14

Figure 7 - MX421 Interface to PC or other Non-Leica NavigationSystems ............................................................................................. 14

PC Interface Cable .................................................................................. 15Figure 8 - MX421 to PC Interface Cable (P/N 722206) ...................... 15

MX421-10 Installation Section ..................................................................... 17Power Requirement ................................................................................ 18MX421-10 Connector Configuration....................................................... 19

Figure 9 - Interface Cable Pin Configuration forMX421-10............................................................................................ 19

External Differential Beacon Receiver Connection ............................... 19MX421B-10 & MX421SB-10 Connector Configuration ........................... 20

Figure 10 - Interface Cable Configuration for MX421B-10 andMX421SB-10 ....................................................................................... 20

Data Interface to MK40 Chartplotter ...................................................... 21Figure 11 - MX421-10 Interface to the MK40Chartplotter........................................................................................ 21

Data Interface to MX420/2 or MK12 CDU ................................................. 22Figure 12 - MX421-10 Interface to a MX420/2 and MK12 CDUs ......... 22

Data Interface to MX420/8 or MX420/AIS CDU ........................................ 23Figure 13 - MX421-10 Interface to MX420/8 or MX420/AIS CDUs ....... 23

Data Interface to PC or Non-Leica Navigation Systems.......................... 24Figure 14 - MX421-10 Interface to a PC chartplotter or Other Non-Leica Navigation Systems ................................................................. 24

Specifications.............................................................................................. 25Data Output ................................................................................................. 27PRODUCT WARRANTY AND LIMITATION OF LIABILITY ........................... 30How Are We Doing? .................................................................................... 32

1

MX421 Installation Manual

Introduction

This manual describes the operation and installation of the MX421 family of high-precision smart antennas.

The MX421 GPS and DGPS smart antennas were designed to work with the latestMX Marine Control and Display Units (CDU) or other NMEA 0183 compatible navi-gation devices. The MX421 can achieve position fix accuracies of better than 1meter with differential correction or better than 3 meters without correction.

Antenna models covered in this manual are:

MX421 - a GPS only smart antenna with an 8-pin power/data connector.

MX421B - a combined GPS and Differential beacon smart antenna with an 8-pinpower/data connector. The beacon receiver operates in automatic modeonly.

MX421-10 - a GPS only smart antenna with a 10-pin power/data connector. Thisantenna can accept differential corrections from an external beacon re-ceiver. A 1 PPS timing output is optionally available.

MX421B-10 - a combined GPS and Differential beacon smart antenna with a 10-pinpower/data connector. The built-in beacon receiver operates in auto mode.

These models use identical housing styles. To determine the particular model ofantenna you have, please check the number of connector pins and the model num-ber inscribed on the serial number tag located at the underside of the antennahousing and consult the section in this manual that refers to it.

Before installing the MX421, please read this manual carefully to ensure properinstallation and operation of the unit.

2


MX421 Operation

The MX421 and MX421B sensors are highly integrated antenna and GPS/DGPSreceiver units that are fully automatic and does not require user intervention. Theywill automatically search for available satellites as soon as power is applied. Theinternal 2-channel beacon receiver in the MX421B and MX421B-10 continuouslymonitors all beacon signals available in your location. The first channel tracks theprimary station while the second channel searches for other available beacons.Should it find a superior signal it will automatically switch the primary channel to thenew station. The combined performance of the high-precision 12-channel GPS and2-channel beacon receivers provide a more accurate and reliable position fix, usu-ally within 1 meter or less.

The MX421SB-10 is an enhanced MX421B-10 DGPS smart antenna unit that caneither automatically tune to the beacon frequency or can be controlled by a MXMarine MX420 CDU to manually select the beacon frequency.

The MX421 DGPS was designed with an H-Field beacon antenna for better on-board electrical noise immunity and requires no grounding.

Receiver Autonomous Integrity Monitoring (RAIM)

RAIM is a special software algorithm in the MX421 program which gives the opera-tor timely warnings when the system should not be used for navigation. This featurerequires at least five or more GPS satellites to operate properly. If the positionsolution error exceeds a preset limit a “RAIM Unsafe (R-)” or ”RAIM Caution (R?)alarm will be indicated in the MX CDU. This means that the accuracy of the positioncan not be guaranteed at that point in time. The operator is advised to take precau-tionary measures until the RAIM indicator switches to (R+) denoting safe RAIMcondition.

Position errors may be caused by unhealthy satellites, incorrect pseudoranges,poor DGPS corrections, excessive atmospheric interference and problems at par-ticular reference stations.

Note:To use the RAIM feature, the following conditions must be met:1) The MX CDU requires a special RAIM option “RAIM license”.2) The MX421 must have the program version V4.846. Older versions of the MX421

are not capable of doing RAIM calculations.

Refer to the MX CDU Operator Manual for RAIM setup procedure.

3


MX421 Mounting

The MX421 antenna housing is weather-resistant and must be located outside whereit will have a good view of the sky around it. Use a standard 1”-14 TPI bracket formounting.

Antenna Connector

The multi-pin connector at the bottom of the antenna housing provides the neces-sary interfacing between the MX421 smart antenna and the latest MX Marine CDUor other NMEA compatible devices. Older production MX421 antennas use 8-pinconnectors while new build units (MX421-10) use 10-pin connectors. The interfaceconnections from pins 1 through 6 are similar for all MX421 models. There areslight differences in Pins 7 & 10 for each model, which are indicated in Table 1. Thetwo additional pins (9 & 10) on the newer production MX421 are used to output the1 PPS signal.

Table 1 - MX421 Smart Antenna Configuration

8-Pin Conn. (old) 10-Pin Conn. (new)Pin#

WireColor MX421

GPSMX421B

DGPSMX421-10

GPSMX421B-10

DGPS

1 BLK/SHIELD Negative Ground

2 RED +10.5 ~ 32 VDC

3 BLU Leica Proprietary Message (LPM) In (-)

4 BRN Leica Proprietary Message (LPM) In (+)

5 ORG GPS Out (-)

6 GRN GPS Out (+)

7 YEL N/C Beacon StatusOut (-) RTCM In (-) Beacon Status

Out (-)

8 WHT N/C Beacon StatusOut (+) RTCM In (+) Beacon Status

Out (+)

9 PRPL N/A N/A 1 PPS (+)

10 PRPL/GRY N/A N/A 1 PPS (-)

4


Supplied Equipment

The following items are supplied with the MX421 Sensor:

Description Part Number

(8-Pin Connector type)MX421 723240or,MX421B 723241

MX421 Installation Manual 72359410 mtr. Antenna Cable Assy. (not included in the kit)(8-wire cable) 722569

(10-Pin Connector type)MX421-10 9525 200 80100or,MX421B-10 9525 200 80110or,

The antenna cable assembly is not included and must be ordered separately.Please specify the cable length required. Below are available lengths in stock:

20 meters 3508 102 70170

40 meters 3508 102 70180

60 meters 3508 102 70640

80 meters (special order only)

5


MX421 High Precision GPS Sensor

Installation Manual

Figure 1 - MX421 Sensor Standard Package

6


MX421 Mounting Guidelines

• Install the MX421 where it has a clear view of the sky around it.

• Locate the antenna for an easy access and maintenance.

• Stay away from high-power energy sources such as radar, SSB, INMARSATand other transmitting radio antennas by 5 meters or more.

• Locate the antenna at least 10 feet (about 3 meters) away from and out ofthe transmitting beam of radar and other high-power transmitters.

• Mount the antenna low to avoid excessive position and speed errors whileunderway (see Figure 1 below).

1 M.3 M.

INMARSATANT.

RADAR ANT.

MX MARINEANT.

VHF OR MF ANT.

MAINMAST

MOUNT THE MX521/421 10 M. (Min) FORWARD OF MAIN MAST

10 Meter (min.)

10 M.

Figure 1 - Antenna Location Diagram

Note: If you are not sure if the chosen location is appropriate, you can mountthe antenna temporarily and operate the unit. Monitor the operation ofthe MX421 while you turn on other on-board electronic equipment. Movethe antenna around until the MX421 operates satisfactorily then mountit permanently.

7


Installation Procedure

Antenna Mounting

Bracket Mount

The MX421 mounting thread is an industry standard fitting for VHF antenna mount-ing (1.0 inch, 14 TPI) . This enables the antenna to be mounted on a wide range ofmounting brackets, including the swivel joints, commonly used for angled surface.Refer to Fig. 2 for bracket mounting illustration.

Note: Hand-tighten the antenna onto the bracket until snug. Do not over-tighten.

Surface Mount

The MX421 may also be surface-mounted. A template is provided to help you cutthe mounting holes. There must be at least a 3 inch clearance at the bottom of theantenna to accommodate the lower section of the MX421 housing and connector.Refer to Fig. 3 for surface mounting considerations.

An 8 or 10 pin (male) plastic connector is mounted at the underside of the antennafor power and data connection.

The supplied cable assembly is 10 meters (33 feet) long, with an 8 or 10-pin(female) connector on one end. This connector plugs into the MX421. When usedwith the MK40 chartplotter or MX420 CDU, the other end of the cable (with loosewires) connects to the antenna junction box as shown in Figure 4. If the MX421 isto be used with other navigation system, refer to Figure 7 (Connection to Non-MXMarine Navigation Systems).

Choose a location for the antenna that has a clear view of the sky. Make sure thereare no major obstructions or metal fixtures in the immediate proximity to the an-tenna. The GPS antenna relies on direct ‘line-of-sight’ signal reception. If you areunsure that the chosen location is suitable, it is advisable to mount the antenna ina temporary manner to verify correct operation.

8


Mounting Surface

1” Diameter/14 TPIMetal Mounting Bracket(not supplied)

Drill 1/4” diameter hole for cable access

Secure cable with plastic tie-wraps(not supplied)

Figure 2 - MX421 Bracket Mount

3.0”

Mounting screws (4 places)

Recommended clearance underthe antenna

MountingSurface

Figure 3 - MX421 Surface Mount

9


MX421 Installation Section

(Use this section when installing the MX421 or the MX421Bwith 8-pin connector)

10


Power Requirement

External power supplied to the MX421 must be within 10.5-32 VDC for best operation.To protect the circuitry in the antenna, the voltage level must be within these limits.Negative grounding is required. The MX421B draws about 230 mA. at 12 VDC. Anin-line fuse or circuit breaker rated at 2 amp. is recommended for overload protection.

When the MX421 is connected to a MX Marine control display unit (CDU), theantenna power can be supplied by the CDU unit.

The red wire connects to the +12 VDC power, while the black wire is the negativereturn. Although the MX421 has a reverse polarity protection, it is prudent to makesure that proper polarity is observed before making the connection.

Note: Reverse polarity connection may damage the unit.

11


MX421 Connector Configuration

The MX421 is a smart GPS only antenna configuration. It transmits the NMEA dataat 4800 baud, 8 bits, 1 stop, no parity. Figure 4 shows the MX421 connector pinassignments.

8 2

34

5

6

7 1

Pin# Wire Signal 8 White N/C 7 Yellow N/C6 Green GPS Out +5 Orange GPS Out -4 Brown LPM IN+3 Blue LPM IN-2 Red +12 VDC1 Black GND.

Figure 4 - Interface Cable Pin Configuration for MX421

Where:Pins 1 & 2: are used for GND and 12 VDC input.Pins 3 & 4: MX Marine proprietary message (MPM) input port.Pins 5 & 6: GPS output to the MK40, MX420 (CDU) or other NMEA 183 compatible

devices.

Pins 7 & 8: Not connected.

12


MX421B Connector Configuration

The MX421B antenna configuration is a combination GPS and beacon receiver inone. The built-in differential receiver operates in auto-search mode. It enhances theaccuracy of the GPS receiver to provide a more accurate position solution. Positionaccuracy better than 1 meter is possible with this configuration.

It transmits the NMEA data at 4800 bauds, 8 bits, 1 stop, no parity. Figure 5 showsthe wiring and pin assignments for the MX421B antenna. The output on pins 5 and6 can be optionally set to output GGA at 5 Hz. The standard NMEA 0183 protocol isthe factory default setting.

Data output change may be done only in the factory.

8 2

34

5

6

7 1

Pin# Wire Signal 8 White Beacon OUT+7 Yellow Beacon OUT-6 Green GPS Out +5 Orange GPS Out -4 Brown LPM IN+3 Blue LPM IN-2 Red +12 VDC1 Black GND.

Figure 5 - Interface Cable Configuration for MX421B

Where:Pins 1 & 2: are the GND and 12 VDC power input.Pins 3 & 4: MX Marine proprietary message (LPM) input port.Pins 5 & 6: GPS output to the MK40, MX420 or other NMEA 0183 compatible

devices.

Pins 7 & 8: Beacon monitoring signal output.

13


Data Interface to MK40 Chartplotter

The MX421 and MX421B connection to the MK40 antenna terminal box is shownbelow. Only three wires from the MX421 or MX421B cable are used, namely;

RED ------------------ +12 VDCBlack/Shield -------- Negative Return and Signal GNDGREEN ------------- GPS Data +

TxD (BRW)N.C.(WHT)RxD (GRN)

+12 V (RED)

GND (SHD)CN1

RX

DG

TXD

GN

D12

V

Pin 6 (Green) GPS OUTPin 1 (Black/Shield) GNDPin 2 (Red) +12 VDC

MX421MX421B

To MK40

Figure 6 - MX421 Interface to the MK40 Chartplotter

14


Data Interface to a PC or Non-MX Marine Navigation Systems

Figure 7 shows the power and data input/output connections to a PC or other non-MX Marine navigation systems using a terminal strip and DB9 connector (usersupplied items) to terminate the wires. This configuration is also used for uploadingthe MX421 software.

Pin 6 (Green) GPS OUTPin 1 (Shield) GndPin 2 (Red) +12 VDC

2 AmpFuse

1 2 4 6

Data Out

Common GND To NavigationPC

Terminal Strip

Red

Gre

en

Shi

eld

123456789

DB9 Connector(Female)

Bro

wn

Blu

e

Pin 4 (Brown) LPM In (+)Pin 3 (Blue) LPM In(-)

Data In

Figure 7 - MX421 Interface to PC or other Non-MX Marine NavigationSystems

15


PC Interface Cable

An optional PC interface cable (P/N 722206) is available shown in Figure 8. Thecable and connectors are pre-assembled to simplify equipment hookup betweenthe PC and MX421. Antenna power can be connected to a 12 volt battery throughthe cigarette lighter adapter. This cable assembly can be purchased from any MXMarine authorized representatives.

Figure 8 - MX421 to PC Interface Cable (P/N 722206)

16


17


MX421-10 Installation Section

(Use this section when installing the MX421 antenna with the 10-Pinconnector only)

18


Power Requirement

External power supplied to the MX421 must be within 10.5-32 VDC for best operation.To protect the circuitry in the antenna, the voltage level must be within these limits.Negative grounding is required. The MX421B-10 draws about 230 mA. at 12 VDC.An in-line fuse or circuit breaker rated at 2 amp. is recommended for overloadprotection.

When the MX421 is connected to a MX Marine control display unit (CDU), theantenna power can be supplied by the CDU unit.

The red wire connects to the +12 VDC power, while the Black wire is the negativereturn. Although the MX421 has a reverse polarity protection, it is prudent to makesure that proper polarity is observed before making the connection.

Note: Reverse polarity connection may damage the unit.

19


MX421-10 Connector Configuration

The MX421-10 is a smart GPS only antenna configuration. It transmits the NMEAdata at 4800 baud, 8 bits, 1 stop, no parity. Figure 9 shows the MX421-10 connectorpin assignments.

1

Pin# Wire Signal 10 Prpl/Gry 1 PPS -9 Purple 1 PPS +8 White RTCM In + 7 Yellow RTCM In -6 Green GPS Out +5 Orange GPS Out -4 Brown LPM In+3 Blue LPM In-2 Red +12~32 VDC1 Black Negative GND.

23

456

78

910

Figure 9 - Interface Cable Pin Configuration for MX421-10

Where:Pins 1 & 2: are used for GND and 12 VDC input.Pins 3 & 4: MX Marine proprietary message (LPM) input port.Pins 5 & 6: GPS output to the MK12, MX420 (CDU) or other NMEA 183 compatible

devices.Pins 7 & 8: connect to an external beacon receiver like the MX Marine MX41R.Pins 9 & 10: 1 Pulse Per Second (PPS) output

External Differential Beacon Receiver ConnectionDifferential corrections from an external beacon receiver can be connected tothe MX421-10 (GPS only) model. Connections are done directly to yellow (Pin7) and white (Pin 8) wires of the MX421-10 I/O cable. It will accept RTCM SC-104 signal at 4800 baud.

20


MX421B-10 & MX421SB-10 Connector Configuration

The MX421B-10 and MX421SB-10 antenna configuration is a combination GPS andbeacon receiver in one. The built-in differential receiver operates in auto-search modein the MX421B-10, while the MX421SB-10 can either be auto or manual mode. Itenhances the accuracy of the GPS receiver to provide a more accurate positionsolution. Position accuracy better than 1 meter is possible with this configuration.

1

Pin# Wire Signal 10 Prpl/Gry 1 PPS -9 Purple 1 PPS +8 White Beacon Status Out + 7 Yellow Beacon Status Out - -6 Green GPS Out +5 Orange GPS Out -4 Brown LPM IN+3 Blue LPM IN-2 Red +12~32 VDC1 Black Negative GND.

23

456

78

910

Figure 10 - Interface Cable Configuration for MX421B-10 and MX421SB-10

Where:Pins 1 & 2: are the GND and 12 VDC power input.Pins 3 & 4: MX Marine proprietary message (LPM) input port.Pins 5 & 6: GPS output to the MK40, MX420 or other NMEA 0183 compatible

devices.Pins 7 & 8: Beacon monitoring signal output. Sends the SNR, Signal and

Frequency to the MX Marine MX420/8 CDU. Connects to Cable B ofthe MX420/8 CDU.

Pins 9 & 10: 1 PPS output

21


Data Interface to MK40 Chartplotter

Follow the diagram in Figure 11 to interface the MX421 antenna to the MK40chartplotter. The MX421-10 and MX421B-10 connection to the MK40 terminal boxis shown below. Only three wires from the MX421 or MX421B cable are used,namely;

RED ------------------ +12 ~32 VDCBlack ----------------- Negative Return and Signal GNDGREEN ------------- GPS Data +

TxD (BRW)N.C.(WHT)RxD (GRN)

+12 V (RED)GND (SHD)

CN1

RX

DG

TX

DG

ND

12V

Pin 6 (Green) GPS OUT +

Pin 2 (Red) +12 VDC

MX421-10MX421B-10

To MK40

Pin 1 (Black) Gnd.

Figure 11 - MX421-10 Interface to the MK40 Chartplotter

22


Data Interface to MX420/2 or MK12 CDU

Use the diagram in Figure 12 to interface the MX421-10 to a MX Marine MX420/2 orthe MK12 CDU.

(2) Red

TerminalStrip

(User Supplied)

Red (+12 VDC)(16) Red/Wht(1) Shield Blk/Shield (GND)

Grn (GPS Out +)Org (GPS Out -)

Brn (LPM In +)Blu (LPM In -)

(8) Org(9) Org/Wht(10) Yel(11) Yel/Blk

In (A)

In (A)

In (B)

In (B)

Out (A)

Out (A)

Out (B)

Out (B)

(4) Brn(5) Brn/Wht

NMEA2 Tx (RS-232)Ext. Alarm

(6) Prpl(7) Prpl/Wht(12) Grn(13) Grn/Wht(14) Blu(15) Blu/wht(17) Gry(18) Blk/Wht(3) Blk

12~32 VDCSupply

+ -

NMEA1 I/O

NMEA2 I/O

MX420/2 orMk12 CDU

MX421-10MX421B-10

Cab

le A

Figure 12 - MX421-10 Interface to a MX420/2 and MK12 CDUs

23


Data Interface to MX420/8 or MX420/AIS CDU

Use the diagram in Figure 13 to interface the MX421B-10 to a MX Marine MX420/8or MX420/AIS CDU.

(2) Red

(4) Brn White (Beacon Status Out +) Yellow (Beacon Status Out -)Purple (1 PPS +)Purple/Gray (1 PPS -)

(5) Brn/Wht(17) Gray(18) Gray/Blk

TerminalStrip

(User Supplied)

Red (+12 VDC)(16) Red/Wht(1) Shield Blk/Shield (GND)

Grn (GPS Out +)Org (GPS Out -)

Brn (LPM In +)Blu (LPM In -)

(8) Org(9) Org/Wht(10) Yel(11) Yel/Blk

In (A)

In (A)

In (B)

In (B)

Out (A)

Out (A)

Out (B)

Out (B)

(4) Brn(5) Brn/Wht

NMEA2 Tx (RS-232)Ext. Alarm

(6) Prpl(7) Prpl/Wht(12) Grn(13) Grn/Wht(14) Blu(15) Blu/wht(17) Gry(18) Blk/Wht(3) Blk

12~32 VDCSupply

+ -

NMEA1 I/O

NMEA2 I/O

MX420/8or MX420/AIS

MX421B-10

Cab

le A

Cab

le B

Figure 13 - MX421-10 Interface to MX420/8 or MX420/AIS CDUs

24


Data Interface to PC or Non-MX Marine Navigation Systems

Figure 14 shows the power and data input/output connections to a PC of other non-MX Marine navigation systems using a terminal strip and DB9 connector (usersupplied items) to terminate the wires. This configuration is also used for uploadingthe MX421-10 software.

Pin 6 (Green) GPS OUT

Pin 2 (Red) +12 VDC

2 AmpFuse

1 2 4 6

Data Out

Common GND To NavigationPC

Terminal Strip

Red

Gre

en

Bla

ck

123456789

DB9 Connector(Female)

Data In

Bro

wn

Blu

e

Pin 4 (Brown) LPM In (+)Pin 3 (Blue) LPM In (-)

Pin 1 (Black) GNDT

Figure 14 - MX421-10 Interface to a PC chartplotter or Other Non-MX MarineNavigation Systems

25


Specifications

GPS ReceiverType: L1, C/A Code (SPS), 12-channel

continuous Tracking.Frequency: 1575.42 MHz (L1 band)Receiver sensitivity: -143 dBm Costas thresholdUpdate rate: 1 Hz to 5 HzDGPS Input: RTCM SC-104 formatReceiver maximum input signal: -10 dBWSatellite measurement use: 12 channel parallel automatic selectionAntenna type: Ceramic PatchMaximum navigation dynamics:Maximum receiver dynamics: 2125 m.p.h. (950 m/s) 4G (39.2 m/s/s)Time to first fix:

Cold start (no almanac or other data): 120 sec. Typical, 150 sec 90% probable

Warm start (almanac, last fix-positionand time known) 48 sec (typical), 60 sec 90% probable

Reacquisition time: <40 sec. Blockage: 2 sec. (Typical)Position accuracy:

With differential corrections <1 meters 2D-RMS depending ondistance from differential base station.

Without differential corrections <3 meter 2D-RMS CEP (SA off)Input/Output interface: NMEA 0183 signal levels (optically

isolated input) at 4800 baud.Datum: WGS84Output messages: NMEA V3.0, GGA, GRS, GSA, GSV,

GST, RMC, VTG, ZDA & PMVXG,GBS(MX Marine proprietary)

Complies with CE emissions: CE EMC Standard EN50081-1EN50082-1

26


Beacon Receiver

(For MX421B model)Frequency: 283.5 to 325.0 kHz. 2-channel Auto or

Manual selection (500 Hz steps)Minimum Signal: 15 uV/mStation Selection: Automatic or Manual on two indepen-

dent receiver channelsDynamic Range: 90 dBAdjacent Channel Rejection: 40 dB (500 Hz)Channel spacing: 500 HzFrequency offset tolerance: + 5 HzAntenna type: H-FieldSensitivity: This is strongly influenced by the

atmospheric noise level. Typically alevel of 40 dBuV/m will provide ausable signal with a 10 dB signal tonoise ratio at 200 bps data rate. Invery quite locations and with a datarate of 50 bps, a level of 20 dbuV/m willprovide a usable signal.

Input/Output interface: NMEA 0183 signal levels (opticallyisolated input) at 4800 baud.

MSK rates: 100 and 200 (automatic or manualselection).

Physical Characteristics

Size: Height 3 1/2 in. (89 mm.)Diameter 7 1/8 in. (182 mm.)

Weigh: MX421 1.1 lbs. (500 gm. without cable)MX421B 1.9 lbs. (860 gm. without cable)

UV stable plastic radome, waterproofMount: 1”- 14 tpiSupply voltage range 10.5 to 32 VDCOperating current: MX421 Typically 200 mA at 12.0 VDC,

MX421B Typically 280 mA at 12.0 VDCOperating temperature range: -25 to +60 Degrees. C

MX Marine reserves the right to make changes in its products and specificationswithout notice.

27


3 ½

" (8

9 m

m)

7 1/8” (182 mm)

1 in.- 14 TPI Mount

28


Data Output

The MX421 GPS and DGPS can be configured in the factory to output any one ofthe following data formats:

• NMEA: GGA, GLL, GRS, GSA, GSV, GST, VTG, RMC, ZDA, MSS

• MX Marine proprietary messages (TBD)

NMEA 0183 Data Output Sentences

(1) GGA - Global Positioning System Fix DataTime, position and fix related data for a GPS receiver.

$GPGGA,hhmmss,llll.llll,a,yyyyy.yyyy,a,x,xx,x.x,x.x,M,x.x,M,x.x,xxxx*hh<CR><LF> 1 2 3 4 5 6 7 8 9 10 11 12 13 14Notes:1 ----- UTC of position2,3 --- Latitude - N/S4,5 --- Longitude - E/W6 ----- GPS Quality Indicator:

0=Fix not available or invalid1=GPS SPS Mode, fix valid2=Differential GPS, SPS Mode, fix valid3= GPS PPS Mode, fix valid

7 ----- Number of Satellites in use, 00-12, may be different from the number in view8 ----- Horizontal Dilution of Precision (HDOP)9 -----Antenna altitude/mean-sea-level (geoid)10-----Units of antenna altitude, Meters11,12-Geoidal Height, Meters13---- Age of Differential GPS Data14 ----Differential Reference Station ID

(2) GSA - GPS DOP and Active SatellitesGPS receiver operating mode, satellites used in the navigation solutionreported by the $GPGGA sentence, and DOP values.

$GPGSA,a,x,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,x.x,x.x,x.x*hh<CR><LF> 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17Notes:1----- Mode: M = Manual, forced to operate in 2D or 3D Mode

A = Automatic, allowed to automatically switch 2D/3D

29


2 ------ Mode: 1 = Fix not available, 2 = 2D, 3 = 3D3-14 -- PRN numbers of satellites used in solution (null for unused fields)15 ---- PDOP16 ---- HDOP17 -----VDOP

(3) GSV - GPS Satellite in ViewNumber of satellites (SV) in view, PRN numbers, elevation, azimuth and SNRvalues. Four satellites maximum per transmission, additional satellite datasent in second or third message. Total number of messages beingtransmitted and the number of the message transmitted are indicated in thefirst two fields.

$GPGSV,x,x,xx,xx,xx,xxx,xx,....................,xx,xx,xxx,xx*hh<CR><LF> 1 2 3 4 5 6 7 8 9 10 11 12Notes:1 ------Total number of messages, 1 to 32 ----- Message number, 1 to 33 ----- Total number of satellites in view4 ----- Satellite PRN number5 ----- Elevation, degrees, 90 degrees maximum6 ------Azimuth, degrees True, 000 to 3597 ------SNR (C/No) 00-99 dB, null when not tracking8 ------2nd and 3rd SV9,10,11,12 - 4th SV

(4) RMC - Recommended Minimum Specific GPS DataTime, date, position, course and speed data provided by a GPS navigationreceiver. This sentence is transmitted at intervals not exceeding 2 secondsand is always accompanied by RMB when a destination waypoint is active.RMC and RMB are the recommended minimum data to be provided by aGPS receiver. All data fields must be provided: null fields used only whendata is temporarily unavailable.

$GPRMC,hhmmss.ss,A,llll.llll,a,yyyyy.yyyy,a,x.x,x.x,xxxxxx,x.x,a*hh<CR><LF> 1 2 3 4 5 6 7 8 9 10 11Notes:1 ---- UTC of Position fix2 ---- Status: A = data valid

V = Navigation receiver warning3,4 -- Latitude, N/S5,6 -- Longitude, E/W

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7 ---- Speed over ground, knots8 ------ Course Over Ground, True9 ------ Date: dd/mm/yy10,11 - Magnetic variation, degrees E/W. Easterly variation (E) subtracts from True course, Westerly variation (W) adds to True course.

(6) GST - GNSS Pseudorange Error Statistics

This message is used to support Receiver Autonomous Integrity Monitoring (RAIM).Pseudorange measurement error statistics can be translated in the position domainin order to give statistical measures of the quality of the position solution.

If only GPS, GLONASS, etc. is used for the reported position solution, the talker IDis GP, GL, etc., and the error data pertains to the individual system. If satellitesfrom multiple systems are used to obtain the reported position solution, the talkerID is GN and the errors pertain to the combined solution.

$GPGST,hhmmss.ss,x.x,x.x,x.x,x.x,x.x,x.x,x.x*hh<CR><LF>1 2 3 4 5 6 7 8

Notes: 1 --------- UTC time of the GGA or GNS fix associated with this sentence.2 --------- RMS value of the standard deviation of the range inputs to the

navigation process. Range inputs include preudoranges & DGNSS corrections.

3 --------- Standard deviation of semi-major axis of error ellipse (meters)4 --------- Standard deviation of semi-minor axis of error ellipse (meters)5 --------- Orientation of semi-major axis of error ellipse (degrees from true

north)6 --------- Standard deviation of latitude error (meters)7 --------- Standard deviation of longitude error (meters)8 --------- Standard deviation of altitude error (meters)

(7) VTG - Course Over Ground and Ground Speed

The actual course and speed relative to the ground.

$GPVTG,x.x,T,x.x,M,x.x,N,x.x,K,a*hh<CR><LF> 1 2 3 4 5 6 7 8 9

Notes: 1,2 ------ Course over ground, degrees True2,3 ------ Course over ground, degrees Magnetic5,6 ------ Speed over ground, knots7,8 ------ Speed over ground, km/hr9 --------- Mode indicator: A = Autonomous mode

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D = Differential modeE = Estimated (DR)M = Manual input modeS = Simulator modeN = Data not valid

(8) ZDA -Time and DateUTC, day, month, year and local time zone

$GPZDA,hhmmss,xx,xx,xxxx,xx,xx*hh<CR><LF> 1 2 3 4 5 6

Notes: 1 --- UTC2, 3, 4 --- Day, month & year5 --- Local zone hours, 00 to + 13 hrs.6 --- Local zone in minutes, 00 to +59.

(9) GBS - GNSS Satellite Fault Detection (Modified MX Marine version)This message is used to support Receiver Autonomous Integrity Monitoring (RAIM)feature in the MX420 CDU. A special character flag was added for proper RAIMstatus determination

$PMVXG,GBS,hhmmss.ss,x.x, x.x,x.x,xx,x.x,x.x,x.x,x*hh<CR><LF> 1 2 3 4 5 6 7 8 9

Notes: 1 ----- UTC time of the GGA or GNS fix associated with this sentence.2 ----- Expected error in Latitude (meters)3 ----- Expected error in Longitude (meters)4 ----- Expected error in Altitude (meters)5 ----- ID number of most likely failed satellite6 ----- Probability of missed detection for most likely failed satellite7 ----- Estimate of bias in meters on most likely failed satellite8 ----- Standard deviation of bias estimate9 ----- RAIM status mode; 0=safe, 1=caution, 2=unsafe

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PRODUCT WARRANTY AND LIMITATION OF LIABILITY

MX marine products are warranted by MX Marine (the “Seller”) to original purchaser(the “buyer”) for use only to be free of all defects in material and workmanship for aperiod of twelve (12) months from date of purchase by Buyer.

If during the warranty period, the MX Marine products or parts thereof (“Product”) arefound to be defective in material or workmanship, Seller shall repair or replace thedefective Product, at the discretion of the Seller.

In order to claim this warranty service, Buyer shall return the defective Product,together with proof of purchase to Seller or its authorized service representative andpay all transportation charges, duties, and taxes associated with the return of theProduct to Seller. Seller shall reimburse Buyer for costs of the return to Buyer ofProduct found to be defective and covered by this warranty. Product which isrepaired or replaced under the warranty is covered by this warranty for the remain-der of the original warranty period or for a period of ninety (90) days after returnshipment to Buyer, whichever is longer.

SELLER’S MAXIMUM LIABILITY ARISING FROM USE OF SELLER’S PRODUCTSHALL NOT EXCEED AND BUYER’S REMEDY IS LIMITED IN ANY EVENT TOREPAIR OR REPLACEMENT AND REIMBURSEMENT FOR COSTS ASSOCIATEDWITH THE RETURN OF THE DEFECTIVE PRODUCT AS PROVIDED HEREIN;AND SUCH REMEDY SHALL BE THE BUYER’S ENTIRE AND EXCLUSIVE REM-EDY.

This warranty does not apply to failure of any equipment not sold to Buyer by Seller,or to any Product which has been subjected to misuse, lightning strike, an acci-dent, or improper installation, maintenance or application, nor does it extend to anyProduct which has been repaired or altered by anybody other than the Seller or itsauthorized service representative, unless such repair or alteration was authorized inwriting by Seller. This warranty also does not apply to batteries and losses ordamage due to the batteries. Since the GPS system on which the Product oper-ates is furnished by the U.S. Government, not Seller, the Seller shall not be respon-sible for the GPS system or changes in the GPS System availability, coverage oraccuracy.

THIS PRINTED LIMITED WARRANTY IS ACCEPTED BY BUYER IN LIEU OF ANYOTHER WARRANTY FOR THE PRODUCT, WHETHER EXPRESSED OR IMPLIED,INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTY OF MERCHANT-ABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

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IN NO EVENT SHALL SELLER BE LIABLE FOR INCIDENTAL OR CONSEQUEN-TIAL DAMAGES OF ANY KIND OR NATURE, INCLUDING, BUT NOT LIMITED TOLOSS OF PROFIT OR REVENUE, COMMERCIAL LOSS, DAMAGE TO OR LOSSOF PROPERTY, ARISING FROM OR RELATED TO THE USE OF THE PRODUCT.

34


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Valued Customers By

sending us your evaluation of this manual. We need to know such things as:

• is the manual complete, or do you need more (or less) information?• can you find the information you need easily?• is the information easy to understand, or could we be clearer?• are there any errors and, if so, where and what are they?

Be sure to reference the title and identification number of this manual:

Installation Manual

P/N 723594

and include your name, address and telephone number. We look forward to findingout how we can improve our information services.All of your comments and suggestions become the property of MX Marine.

Please send them to:MX Marine

23868 Hawthorne Blvd., Suite 201Torrance, CA 90505

United States of America

or write your comments on the Reader Comment Sheet on the next page andmail it to us.

35


Reader Comment Sheet

Installation Manual P/N 723594

MX Marine welcomes your evaluation of this manual. Please note errors, suggestadditions, or make general comments below. Use extra pages if you like. All com-ments and suggestions become the property of MX Marine.

Do not use this form to request purchases, maintenance assistance, or additionalpublications. Please contact your MX Marine marketing representative for purchasesor additional publications, and your nearest authorized service representative formaintenance assistance.Thank you._____________________________________________________________________

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MX Marine (USA)23868 Hawthorne Blvd., Suite 200

Torrance, CA 90505 USA

+1 310 791 8213 Telephone+1 310 791 6108 Fax

MX Marine, Leica Geosystems (UK)Ocean QuaySouthampton

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