How I can connect PLC Delta SV2 to Multimeter KAEL (MULTIMET-01-PC-96) by using RS-485 ModBus - RTU??
Best Regards ..
The manual here
states on page 9 that the device can only reply with one variable per Modbus message/transaction using Function Code 03 (read Holding Register).
The RS-485 wiring has Sg (signal ground) driver lines A and B, and a terminal for TR. I suspect TR is terminating resistance, but it connects to the A driver on one slave device only. Who knows?
Furthermore, that document does not have a Modbus slave table of registers/ addresses and the associated units for the data values. I'd want to find that document before I spent one minute on anything else Modbus.
To connect, you need a Modbus Master, because these are slaves.
It appears that the manufacturer offers a software package.
You might want to see what that software does and whether it meets your needs before struggling through a Modbus implementation.
This link shows ModBus Registration Table <<