+- Logic Machine Forum (https://forum.logicmachine.net)
+-- Forum: LogicMachine eco-system (https://forum.logicmachine.net/forumdisplay.php?fid=1)
+--- Forum: Gateway (https://forum.logicmachine.net/forumdisplay.php?fid=10)
+--- Thread: Modbus problem (/showthread.php?tid=5650)
Modbus problem - BMSimon - 04.10.2024
Is there a way of seeing if the modbus is actually working? I have setup 1 fancoil and i can't connect to it at all.
I found a modbus meter that I have connected temporary and I cant find that one either
![[Image: LTcIKyD.png]](https://i.imgur.com/LTcIKyD.png)
Does this mean that they are working?
RE: Modbus problem - admin - 04.10.2024
Go to Modbus tab and enable the required RTU port. Make sure that your Modbus devices have the same baud, parity and stop bit settings. Then use Read test to check the communication.
It's highly recommended to connect GND/0V between LM and Modbus device. In some rare cases RS-485 A/B is marked incorrectly and should be swapped.
RE: Modbus problem - BMSimon - 04.10.2024
(04.10.2024, 08:00)admin Wrote: Go to Modbus tab and enable the required RTU port. Make sure that your Modbus devices have the same baud, parity and stop bit settings. Then use Read test to check the communication.
It's highly recommended to connect GND/0V between LM and Modbus device. In some rare cases RS-485 A/B is marked incorrectly and should be swapped.
The settings should be correct, but everytime it says: Operation timed out.
We have tried to change the polarity and with different modbus components.
That's why I asked if we could test if the modbus is working somehow?
RE: Modbus problem - admin - 04.10.2024
You can connect both RS485 ports together, enable RTU on RS485-1 and run slave script on RS485-2 (https://kb.logicmachine.net/integration/modbus-rtu-tcp-slave/#modbus-rtu)