Coast Station data communication protocol
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Figure 8 Configuration of Coast Station name in AIS receiver mode
6.2 Heartbeat output
The Coast Station outputs a regular heartbeat sentence. This sentence allows the status of connectivity to the
Coast Station to be monitored. The heartbeat sentence takes the format:
\s:COAST STATION 1,c:1409649473,t:LIVE*6E\$AIHBT,5.0,A,3*23
Where:
$AIHBT,configured_repeat_interval,equipment_status,sequential_sentence_identifier*23
The configured repeat interval is 5.0 seconds. The equipment status will always return 'A' indicating normal
operation.
6.3 Coast Station control sentences
The following proprietary NMEA sentences are used to control the internal data logging process. Commands
may be sent via the network connection from a remote server application. It is also possible to configure the
AIS AtoN element of the Coast Station using NMEA0183 sentences defined for AIS AtoN configuration. Please
contact SRT Marine Systems technical support (support@srt-marinesystems.com) for further information and
advice on remote network configuration of the Coast Station AtoN parameters.
6.3.1 Query the internal data log
$PSMT,CST,QUERY*14
Query the Coast Station for the duration covered by the internal data log. The Coast Station returns the date
and time stamps for the oldest and most recent data in the internal log. An example response is:
\s:COAST STATION 1,c:1409583076,t:LIVE*6A\$PSMT,CST,01-09-2014 14:51:15,01-09-2014 14:20:42,ACK*13
This indicates the internal data log runs from 14:20:42 on 1st September 2014 to 14:51:15 on the same day.
All times are UTC. The 'ACK' at the end of the response indicates that logged data is available. A 'NACK' is
returned in this field if no logged data is available.
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