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Failed to Read Modbus RTU Master
Posted: 11 Oct 2024, 15:52
by Anam
I have trouble modbus rtu master setting on the Revolution Pi Connect S. After setting modbus master in pictory it won't show the output or input. Using RevPi for modbus master, and VSD ATV-320 for modbus slave. Trying to connect directly to a pc using VSD ATV-320 it can already. Why is using RevPi problematic in modbus connection? I have connected it to another modbus slave such as TK4S, it also works.
Re: Failed to Read Modbus RTU Master
Posted: 14 Oct 2024, 09:23
by dirk
Hello Anam,
Please use the steps in this helpful checklist to check whether the physical connection is correctly assembled:
RS-485 Checklist
If this works, then you are not far away from Modbus communication. Then take the steps from this checklist and check whether the setup is correct:
Modbus Checklist
I can also recommend this video tutorial - Modbus RTU Master:
https://revolutionpi.com/en/tutorials/video-tutorials