SRT CS100, Installation And Operation Manual

Page: 20 / 39

Coast Station data communication protocol
Page 17
6 Coast Station data communication protocol
The Coast Station generates NMEA0183 sentences with a standard format TAG block for transport over a
TCP/IP connection. The tag block includes three parameters as defined in the table below. Further information
on NMEA0183 TAG blocks can be found in the latest NMEA0813 standard document.
An example sentence including TAG block is provided below:
\s:COAST STATION 1,c:1409580181,t:LIVE*60\!AIVDM,1,1,,B,13:PSCgP00wle`bMEsOf4?wp2D00,0*3E
This shows a live data sentence from the Coast Station 'Coast Station 1' received at UNIX time 1409580181
(Mon, 01 September 2014 14:03:01 GMT).
\s:COAST STATION 1,c:1409581305,t:LOGGED*7B\!AIVDM,1,1,,A,3;VjmcOP4hOle`2MEs7hKwwp00T1,0*31
The second examples shows upload of logged data from Mon, 01 September 2014 14:21:45 GMT.
6.1 Setting the Coast Station name
The Coast Station can operate as an AIS receiver or as a AIS AtoN. When the Coast Station is operated as an
AIS AtoN the name is set during configuration as defined in section 7.4. However, when the Coast Station is
used as an AIS receiver it is not possible to set the Coast Station name via the ‘Real AtoN’ tab in proAtoN as
this will only be successful if an MMSI is also programmed into the Coast Station and MMSIs are not required
for receive only AIS devices.
Note that it is not essential to set the Coast Station name. Omitting to set the Coast Station name will mean the
‘source identification’ field in the tag block will be empty. All other functionality is unaffected.
To configure the Coast Station name in AIS receiver mode:
1. Install and launch proAtoN as described in section 7.1.
2. Connect the Coast Station to a PC as described in 7.2.
3. Connect proAtoN to the Coast Station as described in 7.3.
4. Go to the serial tab in proAtoN and enter the command $PSMT,CST,SETNAME, <name> as shown
below where the name chosen is ‘COAST STATION’, then click ‘Send’.
TAG block parameter Contents
s (Source identification)
The name of the Coast Station, taken from the first 15 characters of
the Coast Station name (see section 6.1)
c (UNIX time)
The Unix time stamp (seconds since 1/1/1970) for reception of the
proceeding AIS message.
For Live data this is the current time, for logged data this is the time
the logged data was captured.
t (Text string)
Text describing the proceeding data as either live or logged. The text
is either 'LIVE' or 'LOGGED'.
When uploaded logged data from the Coast Station this parameter
is used to differentiate live and logged data in the output data
stream.