I'm trying to use RS485 for communication with PLC because the PLC does not yet support modbusTCP (Beckhoff CX7080).
i'm using RUT...06.09. version.
I tried using under services -> RS232/RS485 the RS485 settings but when i started modbuspool and connected i saw in PLC (slave) error: "Illegal Function". I'm presuming, that "RS232/RS485" is not Modbus but only RS485 protocol. Is that correct or how?
I have also tried using Services -> Modbus and then Serial Master but can't find how to use the further.. so how to read reg.
My PC is connected to RUT LAN port. and on RS485 connector is reciver and driver (-) connected together and also reciver and driver (+) together.
I have tried with a master PLC and TGW715 and know that the "slave" works OK.
Can anyone explain what is wrong or has some correct instructions on how to do this?