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RS-485 port using on ETRAX LX and RS-485-to-RS232 converter by Moxa...

  We have some troubles with connection rs-232 device via Moxa A52 Smart
  Converter to devboard's rs485 port.  Programm inside DevBoard can't get
  valid data from rs-232 device, behinde conerter.  In other side, Moxa A50
  converter work perfect.
  programm use /dev/ttyS3 device as serial device, set speed, baudrate, parity..
  can anyone comment this?  any solutions?