Hardware specific information for this card is available on the page. The multi-function serial accessory card supports these modes: Loopback (default) (loopback) RS-232 with RTS/CTS flow control (rs232) For RS232, the supported range of speeds are (in bps): 300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200, 230400, 460800, and 921600. RS422/485 full-duplex (rs422-485-full) … Continue reading MTAC-MFSER Usage