Siemens S7-300 User Manual page 21

Run the VCOMM virtual serial port software on the PC, set the simulated virtual serial port on the
PC. Select VCOMM as Server mode, wait for the client to connect. Choose the device detector to
create the virtual serial port.
Add a new virtual serial port, the monitoring IP address = PC IP address, client mode device try to
connect the port = VCOMM software port, this is 8000.
Click OK and exit the software and re-run VCOMM, server side VCOMM will accept the client side
ETH Adapter CN connection. A new serial port COM3 will appear on the PC after the connection
is established. And this serial port will also appear in the Windows System Device Manager, then
you can choose this serial port in your applications,like STEP7.
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