Dear Expert
I have a RUT955 Router which include RS485 and RS232 port.
I need use Over IP function for it and Router work in TCP server Mode. The diagram is below picture
For this, you can use HW VSP3 application. There, you can create a Virtual COM port towards IP address of RUT955.
Then you can use the COM port on your PC to communicate with your PLC. This depends on your application. For testing, I would suggest using Hercules application where you can select your COM port created with HW VSP3 in the serial tab.