Why Xinjie text OP320-A and the PLC always showing communication?

1. Do you see if the range of devices used in your screen exceeds the scope of the PLC?
2. Check if the station number of the device of your text screen is No. 1, default No. 1
3. Check if the plc port and your computer can be connected. If you can check your line pair is not right.
4. All of the above are excluded and sent back for repair.

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