The line settings are all fixed:
Unique ID for this controller.
The RS232 device to which the Raptor interface is connected. (COMx, /dev/ttySx, /dev/ttyUSBx)
The PC protocol is not recommended for polling S88 inputs; Not supported.
The manual states: "This “INPut” command is not designed and not intended to be used as a part of train controlling by a computer."