Modbus RTU - "Response not from selected slave"

[iJAF]

Do you have GND connected between RS-485 nodes? It seems that line is not put into idle state properly. Which adapters are you using?

I'm only using D1/D0 or A/B lines. Usually that is enough when I work with RS485 RTUs (PLCs, VFDs, Meters, Protections, etc).

My main converter is a TSXCUSB485 from Schneider Elec. This one, is the one that dows not work properly, from the printscreens above.
This is strange because this one works where all of the others fail.

The one that works fine is my second converter, one cheaper from ebay with the CH340 chip, that only has A/B terminals, no GND !

See here the Adapter

But i will try to add the GND line to see if there is any diference !

Thank you