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Fw: Configuration of Baud Rates > 115200

Hi all,
I' am just modifying software for the devboard 82. I found the configuration for the RS422 serial port in a start script like:
stty -F /dev/ttyS3 115200 cs8 cstopb -crtscts raw -echo ...
When I tried to increase the baud rate to 307200 (1.8 MB should be possible for the RS422 port) I got the message 'invalid parameter'. So there must be a different way to configure higher baud rates.
Has anyone an idea?
Thanks in advance!
Martin Dittmer