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Please note that you need to properly set the DNS server of the client ES-ETH-PPI, input the
domain name kollew.changeip.net in the remote host IP box, host port is the port number of server
ES-ETH-PPI. So that when the client ES-ETH-PPI connect the domain name of Internet, it will
automatically connect to the Internet address (the external network IP address) of the server-side
router,the router automatically transfer to the server module, achieve the remote communication
from S7-200PLC's serial port to another S7-200PLC’s serial port.