Siemens S7-300 User Manual page 18

The setting of ETH Adapter CN serial port parameters is omitted here, you can see the previous
description.
Set ETH Adapter CN working mode as TCP Server, port No. = 27011, waiting for clients to
connect.
Run the VCOMM virtual serial port software on the PC, set the simulated virtual serial port on the
PC. Select VCOMM as Client mode, initiatively to connect the server-side equipment. Choose the
device detector to create the virtual serial port.
Add a virtual serial port, the remote server IP address = ETH Adapter CN IP address, remote
server monitoring port = ETH Adapter CN port.
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