Installation Manual

42 Issue 1 AIS Installation Manual
error messages. A request for information may be sent from equipment connected to the Main
and AUX ports, ether a request for information or a request for the Transponder to carry out a
specific task. The communication protocol is text, but in non-readable sentences which contain
compressed binary data.
The Transponder Main/AUX input port can accept requests:
• To send a short text message or a small binary data array to a specified address (MMSI)
or as a broadcast message
• To send a static or voyage information request to a specified address (MMSI)
• To change AIS radio frequencies and/or parameters of access to AIS channels (radiating
power, frequency band etc.)
The Transponder Main/AUX input port can accept:
• Static and voyage related data
• Navigation or dynamic data, similar to sensors data interface
• Error situation message acknowledgement
The Transponder Main/AUS output port can transmit:
• Notifications about every VHF message received and transmitted via AIS channels with
the VHF message included
• Acknowledgement of requests from other stations