In the Smartsdr Cat I see it would be the one with the (Auto-Switch TX) beside the Blue-Box C or the Blue-Box C with Tcp 5002 with (no other programs running) and Slice A only running.
if this is the logic I get it.
Now how about in the computer Device Manager. How would you tell the difference between them all?
SmatSDR CAT creates a virtual com port pair. One end connects to the third-party applications (what you see in the Control Panel) and the other one connects to SmartSDR CAT. SmartSDR CAT then performs a protocol translation and sends it to the radio over a TCP connection.
So there is a pair of ports. In 1.6 it is the base port plus another port that is 100 com ports higher in value. For example Com5 <-> COM105.
IF YOU DELETE ONE OF THESE PORTS MANUALLY THAT CAT PORT WILL FAIL TO WORK PROPERLY. Never delete the ports manually - Use the SmartSDR CAT Control Panel to do it.
If you want to see the high numbered port, use the Advanced Mode of editing a port. This is covered in the SmartSDR CAT 1.6 manual.