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3.3 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.)
3.4 Information Transmitted And Received
3.4.1
A Class A unit will transmit its IMO number (if known), MMSI, Call sign and Name, length and
beam, ship type, time, course over ground (COG), speed over ground (SOG), heading,
navigational status, rate of turn, draught, cargo type, destination and safety related messages
via a short message service (SMS) facility. Message lengths are variable with static and voyage
related information being transmitted less often.
3.4.2
A Class B unit will transmit its MMSI, Call Sign and Name, length and beam, ship type, time,
course over ground (COG), speed over ground (SOG) and heading.
3.5 Built In Test
The NAUTICAST-B 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 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
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Y1-03-0222 Rev T4T4
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