Yacht Devices YDNU-02RM, Руководство пользователя

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4. The application must send a mode activation sentence (see Table 1) immediately after opening
a port. Recommended sentences do not cause sending of any message to NMEA 2000 network.
In the AUTO mode, the Device analyzes first bytes received from the application for the first
2000 milliseconds after the port is opened. If no data are received during that 2000 milliseconds,
or received data cannot be interpreted as an activation sentence, the Device activates 0183 mode.
5. The application should avoid sending messages byte-by-byte. It is recommended to prepare
a message (or even set of messages) in a memory buffer first and send it to the port with one call.
Byte-by-byte calls can cause a series of one-byte USB packets that can have negative performance
effect.