Modpoll's communication setup seems to support only a single IP address for the server. So I've been unable to view two Modbus/TCP servers, each in the their own window because I cannot find a means to establish a 2nd communications setup for a 2nd server.

I know at some time in the past, I had two Modbus RTU slaves on an RS-485 bus displayed, each in the their own window, by declaring the slave ID for the appropriate slave in Setup > Read/Write Definitions where both slaves shared the single communications setup.

Any chance I've missed the means of setting up a 2nd comm setup for a 2nd TCP server?

 

If you mean the program found here: https://www.modbusdriver.com/modpoll.html
You need to open two Command Prompt windows and enter the commands in each window:
modpoll.exe -m tcp 10.20.30.40
modpoll.exe -m tcp 10.20.30.41

 

Sorry, I realized you mean the Modbus Poll program found here:
https://www.modbustools.com/download.html
I downloaded it, installed and ran two instances of mbpoll.exe program.
From each instance I can connect to a different modbus TCP server.