A13 with Mod-rs232

[demptis82]

I am running an A13 board with a Mod-rs232 connected to the UEXT port.  I have a standard RS232 DB9 device on the other end.

I was wondering if anyone had attempted this before and could provide me any guidance on how to make it work.  Best I can tell, the serial port should be /dev/ttyS0, but despite all my configuration attempts, no data seems to be passing through to the device. 

I am running an SD card with Linux, and I would appreciate any help I can get.  Is there something more I need to do aside from setting is up (stty -F /dev/ttyS0 ispeed 19200, stty -F /dev/ttyS0 ospeed 19200) and sending the data (echo "test" > /dev/ttyS0)

Thanks!