Siemens S7-300 User Manual page 20

Set PC as server, ETH Adapter CN as client,let adapter take the initiative to connect the PC.
Set the ETH Adapter CN network parameters, the gateway of ETH Adapter CN,PC and router
must be same, the DNS server needn't to be setted because you don't use the dynamic domain
name on the Internet.
The setting of ETH Adapter CN serial port parameters is omitted here, you can see the
previous description.
Set ETH Adapter CN as TCP Client,remote host IP=PC IP address,host port=VCOMM software
port No..That's to say,the ETH Adapter CN will take the initiative to connect the server VCOMM
with IP=192.168.1.108,port No.=8000.
- 20 -