The RP-COM(FIT)H and RP-COM(FIT)H-AF can create a COM port by adding
an I/O module.
The type of I/O module that can be added is [F&eIT I/O module] in the
supported devicestopic.
The maximum number of I/O modules that can be added is three.
The Device ID of the added I/O module is set by a rotary switch on the
device.
Be sure to use either "0", "1", or "2".