> ./muestty -i RS4852W /dev/ttyM0

device: The MUE seires device node.
For example:
    
    To set the interface
    # muestty -i RS422 /dev/ttyMUE2

    To set the terminator resistor
    # muestty -t 120TERM /dev/ttyMUE5
  
- muestty     Device configuration tool for MUE series PCI Express
         multiport board(CP-102E, CP-102EL, CP-132EL, CP-132EL-I,
         CP-114EL, CP-114EL-I).

Не понятно почему нет Вашей в списке...

Попробуйте

modprobe mxupcie interface=2 terminator=1
             |          |
             |          +- 120 ohm
             +-------------- RS-422

      The interface and terminator have values to set as fellow.
      
      Option    Value    Comment

      interface      1    RS-232
             2    RS-422
             4    RS-485 2 wire
             8    RS-485 4 wire
    
      terminator     0      0 ohm
             1    120 ohm