Comtrol FreeWire - Manual (Page 43)

DeviceMaster FreeWire Installation and User Guide: 2000412 Rev. D Connecting the Serial Device - 43
TCP Port Connections
TCP Port Connections
The DeviceMaster FreeWire supports port connections over TCP/IP using raw
TCP ports only. The TCP ports are allocated as follows.
Port Destination Device
3001 RS-232
9100 RS-232
9200 RFC 2217
You should set the port to port
forwarding in routers and firewalls.