Attached is a simple communications test program
You can set up the communications the same way that our Protocol Manager software communications is set up.
See links below.
https://www.despatch.com/Protocol-Manager-Software-Setup-video.html
https://www.despatch.com/Protocol-Manager-Comm-Setup.html
When the communications are set up correctly, the program will say Online, and give the temperature that is displayed on the Protocol3 control.