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Sunday, October 20, 2019
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Connecting Delta SV2 PLC Using Modbus
Connecting PLC Delta SV2 to Multimeter KAEL via ModBus RTU


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 <<