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Q : What should I do if the HMI is connected to GD300-01A and the display communication fails?
A: First of all, ensure that the wiring is correct. HMI and GD300-01A are connected through RS485 interface, please refer to the wiring diagram for correct wiring;
Secondly, check whether the Modbus communication parameters (P14.00~P14.02) of GD300-01A have been modified, usually use the default value.
Finally, you can also enter the HMI setting interface to confirm whether the COM port settings are correct.
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