Yacht Devices YDNU-02NF, Руководство пользователя

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The format of messages sent from application to Device is the same, but without time and direction field.
Outgoing messages must end with <CR><LF>. If the message from application is accepted, passes filters
and is transmitted to NMEA 2000, it will be sent back to the application with ‘T’ direction.
For example, the application sends the following sentence to the Device:
19F51323 01 02<CR><LF>
When this message is sent to the NMEA 2000 network, the Application receives an answer like:
17:33:21.108 T 19F51323 01 02<CR><LF>
The Application will get no answer if the message filtered or the message syntax is invalid.
The format of NMEA 2000 messages is available in Appendix B of NMEA 2000 Standard, which
can be purchased on the site www.nmea.org .