Modbus RTU - "Response not from selected slave"

[iJAF]

Hello, I'm trying some integrations with Modbus RTU slaves.

I am simulating the slaves with Modbus Slave software and an usb rs485 converter to see the traffic between te Master and the Slave.

I am using the "RTU Read Test" option and I am observing a strange behaviour.

The telegrams are exchanged fine but I get "Response not from selected slave" !!

I tested with a cheaper usb converter from ebay and with the same traffic comunication the response is accepted !




The traffic is the same ! the configurations are the same !

I'm not understanding why this don't work with my usb converter !

Any indea ?

Thank you