I have the 4201 set up and working via port 502, using Modscan32. When I try to use Port 2001, I get no response.

Please note that modscan32 does not support embedded modbus messages in a TCP/IP packet. Modscan32 uses MBAP messaging, which is what the ProLinx driver uses on port 502. In order to use port 2001, and have that data pass-thru to port 0 modbus master port, you'll need a software package that creates a virtual comport on your pc. Modscan32 will then connect to ie: com8 which is the virtual comport. If you don't have a Modbus slave connected to port 0, it will timeout regardless of your Modbus TCP status.

Related Keywords:

ProLinx Modbus TCP/IP EtherNet