ACR Electronics Y1-03-0222, AIS-300 manual Data port messages, Built-in test, LED indicators, Power

If the red LED illuminates continuously, the unit should be assumed to be faulty. It should either be switched off (power removed) or, if this is not practical, any other vessel position information derived from the unit should not be used. It should also be assumed that the unit is not transmitting valid position information for your vessel.

The unit should be examined by a competent equipment maintainer at the earliest opportunity.

More details on LED indications can be found in “LED Indicators” (below).

3.Data port messages

The data port will output the following:

(At power-up) boot-loader and main application splash text screens including version numbers, and memory status

Details of relevant AIS transmissions received Details of AIS transmissions sent

Details of channel management messages received Alarm messages generated by the BIIT function

The data port will accept the following inputs:

Programming information

Alarm acknowledgements

Please see the ‘Data Interface’ section of this manual for more details of the data port messages.

When in operation, an AIS unit:

Uses one of two VHF channels within the international marine band allocation (channel 87B; 161.975MHz, or channel 88B; 162.025MHz) to regularly transmit information such as the vessel position, Maritime Mobile Service Identity (MMSI), name, speed, course, etc.

Receives similar information from other AIS equipped vessels within VHF range and outputs that information for use by an external display medium (AIS enabled chart plotter, PC using AIS enabled chart plotter software etc.)

4.Built-in test

The Nauticast™-B AIS unit is equipped with Built in Integrity Testing (BIIT). BIIT tests run continuously or at appropriate intervals simultaneously with the standard functions of the equipment. The BIIT detects any failure or malfunction that will significantly reduce integrity or stop operation of the Nauticast™-B AIS unit.

The tests include:

AIS TX malfunction (synthesizer not locked and TX time-out not exceeded)

Antenna VSWR exceeds limit

Rx channel 1 malfunction (synthesizer not locked)

Rx channel 2 malfunction (synthesizer not locked)

Internal GNSS not in use

No valid SOG information

No valid COG information

Background noise > -77dBm

GPS failure

VSWR exceeding the maximum allowed level

The input voltage is out of the specified range

5.LED indicators

Power

This is a green LED which indicates, when lit, that power has been connected correctly to the transponder, that the transponder hardware has been configured, that the operating software is present, that the CPU has booted up and the application software is running.

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Y1-03-0222 Rev. C