> For the complete documentation index, see [llms.txt](https://docs.ceruleansonar.com/c/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ceruleansonar.com/c/rov-locator/communicating-with-the-rovl/serial-parameters.md).

# Serial Parameters

All receivers/transceivers support TTL-level serial communication at 115,200 baud, 8 bits, no parity, one stop bit.

All Transmitters with firmware prior to July 1, 2021 operate at 115,200 baud, 8 bits, no parity, one stop bit. Mk II transmitters with firmware after July 1, 2021 operate at 9600,N,8,1 if the autosync option is installed and 115,200 baud, 8 bits, no parity, one stop bit if not autosync.  Mk III transponders operate at 115,200 baud, 8 bits, no parity, one stop bit.