MOXA

1. Download the latest driver here http://www.moxa.com/support/sarch_result.aspx?type=soft&prod_id=325&type_id=9
2. Unpack to /usr/mydrv/mxuport
3. Install driver

   # make
   # make install
   # modprobe mxuport

4. Set port parameters

   # setserial -g /dev/ttyMXUSB0
   # setserial /dev/ttyMXUSB0 port 0x1

   where port is used for change port interface:

     port values:
         0x3 RS-485 4W
         0x2 RS-422
         0x1 RS-485 2W
         0x0 RS-232

See also:
Adding support for MOXA to java driver RXTXComm
How to use serial ports on Ubuntu

Driver: http://www.moxa.ru/forum/index.php?app=core&module=attach&section=attach&attach_id=1030 forum