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RS-485 problem



Hi
 
We have two devboard 83's connected to each other via RS-485.
 
When transmitting data to /dev/ttyS3 from one board to the other using
 
echo "hello" > /dev/ttyS3
 
it works fine, but when doing the same from the other board that received the data earlier,
 
the command doesn't respond i.e. the board hangs until I press CTRL C.
 
Any suggestions are welcome.
 
Thanks
 
Jayson Ingels