RS485 communication error, it is often not error messages,
Hard to check that part of the problem.
Here are a few to trace the order:
1 Confirm the PLC is set up correctly.
2 confirm there RS485 data sent.
3 Confirm whether to receive RS485 data sent to their ownformat (MODBUS / ASCII / RTU) is correct. (Optional)
4 Check the wiring + / -.
5 external devices to connect one.
6 External device station number is set correctly.
If you still can not connect:
If you have the confirmation, can be + / - exchange.
If you could only pick one, you can not connect more than one, you can view the terminal resistance.
Other .... not encountered.
Hard to check that part of the problem.
Here are a few to trace the order:
1 Confirm the PLC is set up correctly.
2 confirm there RS485 data sent.
3 Confirm whether to receive RS485 data sent to their ownformat (MODBUS / ASCII / RTU) is correct. (Optional)
4 Check the wiring + / -.
5 external devices to connect one.
6 External device station number is set correctly.
If you still can not connect:
If you have the confirmation, can be + / - exchange.
If you could only pick one, you can not connect more than one, you can view the terminal resistance.
Other .... not encountered.
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