Digiport Connectport TS16

I am trying to connect to some legacy devices that I suspect may have some compatibility issues.

The end state will be connecting an OPTO22 R1 brain connection through the TS16 to the legacy devices.

For testing purposes I’ve got modbustools loaded on a workstation. using the realport setting i can connect over the com port and read coils/registers/etc. keeping the starting address and the length the same, when i reconfigure for tcp connection i get an error code 2.

Is there a setting within the digiport I need to check so it will still send the commands to the legacy devices as Modbus/RTU? Does it do that by default? given that the realport configuration works I’m thinking I’m missing something in the TCP setup.