General discussion • CM4 does not support serial port rates less than 1200 Baud

Dear all,

I use a CM4 board on a basboard to speak to an ancient device which only supports 300 Baud. Using the screen program and a digital scope, I have found the following:

screen /dev/serial0 2400 cs7 evenp -cstop => 2400 Baud
screen /dev/serial0 1200 cs7 evenp -cstop => 1200 Baud
screen /dev/serial0 600 cs7 evenp -cstop => 1200 Baud
screen /dev/serial0 300 cs7 evenp -cstop => 1200 Baud
screen /dev/serial0 150 cs7 evenp -cstop => 1200 Baud

If I set an non-standard rate, the port defaults to 9600. Any Baud rate less than 1200 it will be stuck in 9600 until I set a rate of 1200.

Any workarounds?

Thanks,
Hans E.

Statistics: Posted by bighans007 — Wed Sep 04, 2024 12:51 pm — Replies 0 — Views 33

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