Modbus RTU - "Response not from selected slave"

[iJAF]

Have you tried changing polarization via on-board switch on TSXCUSB485?

Yes, first thing I have tried, but with no success. That was my first thought, the absence of pull up/pull down resistors in RS485 line spacelynk/LM.


But it is working now with ground connected like you have suggested !

I don't understand is why the cheaper from ebay works with only A/B and the bigger one form schneider don't