Phong Posted March 25, 2017 Report Posted March 25, 2017 Dear All I have some trouble. I'm trying to send message from module 3G GSM to port 502 of PLC M251 through internet. - Port 502 of PLC M251 opened. I used port forwarding. - Program send message is ok. - At PLC M251 receive message, I write program receive as below image, but I cannot receive message. Please help me some advise. Thank alots.
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