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Valid for:CB 2103H1903

Gyro Interface

Please Note:

Any responsibility or liability for loss or damage in connection with the useof this product and the accompanying documentation is disclaimed. Theinformation in this quick guide is furnished for informational use only, issubject to change without notice, may contain errors or inaccuracies, andrepresents no commitment whatsoever. This agreement is governed bythe laws of Denmark.

Doc. No.: M1903COM Issue: C/0434

1Gyro Interface

Contents1 Introduction .......................................................................................... 12 Technical Specification ....................................................................... 13 Configuration switch description ....................................................... 24 Synchronizing ....................................................................................... 35 Alarm signals ........................................................................................ 36 Dimensions and drilling plan .............................................................. 47 Connection diagram ............................................................................ 5

1 IntroductionThe Gyro Interface is a microprocessor based gyrocompass interface whichallows connection of conventional marine type gyrocompass - providinganalogue heading information - to an AIS, VDR or other modern navigationalequipment requiring heading information in serial NMEA0183 format.

The Gyro Interface will convert a variety of step and synchro type analogueheading signals into NMEA0183 - $HEHDT data format. Designed as auniversal interface most 180:1 step type or 360:1 synchro type signals areaccepted by the Gyro Interface. Effective with software VAX 004 V3 the GyroInterface will accept also 45:1 step type and 90:1 synchro type gyro signals.An intelligent software algorithm maintains tracking of the gyrocompassheading signal and heading data output is transmitted once per second or 10times per second (dip switch selectable).

2 Technical SpecificationPower Supply: 8 to 32V DC, current consumption - 70mA max

Inputs: Step type positive or negative common, 10 30V DC and30 80V DC phase voltage selectable by dip switch SW1.Synchro - 20 to 50V 50/60 Hz and 50 to 120V 50/60 Hz bothphases and reference, selectable by dip switch SW2.

Outputs: NMEA 0183 standard $HEHDT (incl. checksum), 4800 baud,three RS422 and one RS232 with phase inverting by switch SW4.

Inputs, outputs and power terminals are galvanically separated from eachother.

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2Gyro Interface

3 Configuration switch description- SW1: Step phase voltages

SW1 10 30V 30 80V1 On Off2 On Off3 On Off4 Not used Not used

- SW2: Synchro phase and reference voltages

SW2 20 50V 50 120V1 On Off2 On Off Phases3 On Off4 On Off Reference

Note: It is important that the switches SW1/SW2 for selecting the appropriatevoltage rating applicable to the gyrocompass input signal, be set correctlybefore applying the input signal to the Gyro Interface. Failing to do so maydamage the Gyro Interface input circuitry thus voiding warranty.

- SW3: System configuration

SW3 Function Position1 NMEA On 10 per sec.

output rate Off 1 per sec.2 Input On SYNCHRO

selector Off STEP3* Gyro On 90:1 SYNCHRO

ratio 45:1 STEPOff 360:1 SYNCHRO

180:1 STEP4-6 Not used, for future applications

* Valid for software version VAX 004 V3 onwards.

- SW4: RS232 phase. 1 true; 2 inverted.

- SW5: Not used.

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3Gyro Interface

4 SynchronizingTo synchronize heading data output with gyrocompass heading set actualgyrocompass heading on Gyro Interface dial selector and press align buttonfor approx. 5 sec. until a long audible signal is heard and control lamp lightssteadily, confirming the successfull alignment of heading data.In case heard of temporary loss of power supply input to the Gyro Interfacean audible signal will be heard along with the control lamp flashing upon therestoring to normal power supply input conditions, thus indicating that re-synchronization of heading data and actual gyrocompass heading is required.The audible sounding of an alarm condition may be muted by pressing thealign button for approx. 1 sec.

5 Alarm signalsDetection of a failure in gyrocompass heading input signals or internalmalfunction of Gyro Interface is indicated by light and audible signalling.Steady lit control lamp indicates that no internal malfunctions or failure ofgyrocompass heading input signals have been detected.No light in control lamp and no audible signal suggest missing power supplyinput.Control lamp flashing once per second warns of a faulty or Not readycondition. Interpretation of the audible signalling is detailed in the followingtable:

Type of Signal DescriptionFour short beeps Supply voltage restoredOne short beep Button released OR acoustic alarm cancelledOne long beep Synchronization successfulTwo short beeps every 2 secs.

Synchronization lost (e.g. due to R.O.T. (Rate of turn) exceeding limits)

(Two short + One long) beeps every 4 secs.

No reference voltage on SYNCHRO inputs (R1, R2) OR no supply voltage for STEP inputs

(Two short + Two long) beeps every 4 secs.

Lack of at least one phase signal on SYNCHRO or STEP inputs

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4Gyro Interface

0322

39085

Weight: 0.5 kg

125

125 81.5

7.5110

7.5

110

4x4

136

131

6 Dimensions and drilling plan

5Gyro Interface

OUT

COMM

ONB A B AA B

RS2

32 O

UTP

UT

RS4

22 O

UTP

UT

RS4

22 O

UTP

UT

RS4

22 O

UTP

UT

GYR

OC

OM

PASS

STE

P SI

GN

AL

PH

AS

E 3

COMM

ON

PH

AS

E 2

PH

ASE

1

S1 S2 S3 R1 R2

GYR

OC

OM

PASS

SYN

CH

RO

SIG

NAL

+ -

8-32

V D

C P

OW

ER

SU

PP

LY

BOX

GND

OR

3908

8

Note: In case heading tracking on the receiving equipment proves tomove in opposite direction of actual gyro compass heading, swap two ofthe phase lines of the gyro compass step or synchro signal input.

7 Connection diagram

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