I have worked with E controller.
There are two ethernet port on the 1TA board in which you can plug your network cable inside the controller. So depends on where you plugged your cable in.
Either Port 1 or Port 2
Assuming your network cable is plugged into port 1, set up port 1 under Aux function menu 0812
Then set your PC to the same IP range
In KRTerm goto Com Menu - > Options -> add the TCP/IP info you entered into the robot.
Port No. can stay on default 23
Regards