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APPENDIX E. Format of Messages in RAW Mode
In RAW mode, network messages are converted to plain text format. We recommend
that software developers support this format in applications because it is the easiest
option. In the terminal window, NMEA 2000 messages look like a log in a chart
plotter.
Messages sent from Device to PC have the following form:
hh:mm:ss.ddd D msgid b0 b1 b2 b3 b4 b5 b6 b7<CR><LF>
where:
• hh:mm:sss.ddd
— time of message transmission or reception, ddd
are milliseconds;
• D
— direction of the message (‘R’ — from NMEA 2000 to application,
‘T’ — from application to NMEA 2000);
• msgid
— 29-bit message identifier in hexadecimal format (contains
NMEA 2000 PGN and other fields);
• b0..b7
— message data bytes (from 1 to 8) in hexadecimal format;
• <CR><LF>
— end of line symbols (carriage return and line feed, decimal
13 and 10).
