Hi,
I have a MultiPlus-II 48/5000 GX running Venus OS v3.66.
My grid meter is a Carlo Gavazzi EM340 that originally came with my EV wallbox charger.
The wallbox was directly connected to the EM340 via RS485.
What I did:
I inserted a Modbus TCP server onto the EM340. This device converts RS485 to TCP. The RS485 signal from the wallbox device is converted with a modbus TCP client to TCP. The protocol of the device is none (instead of Modbus. wouldn’t work with the wallbox charger with the modbus protocol). Now the wallbox reads the EM340 perfectly with the modbus client.
I want the GX to read the same EM340 over the same Modbus TCP server – so one single EM340 shared by two Modbus TCP clients (wallbox + GX). No extra wiring.
GX modbus tcp setup:
I added the modbus server settings (IP + port + clientnumber). I tried scan for devices, but the EM340 is not detected.
Can the GX recognise the Carlo Gavazzi EM340 over Modbus TCP, or only when it is directly connected via its own RS485 port?
When using a Modbus TCP gateway, does the automatic detection (the built-in EM340 RS485 driver) still work (RS485 registers translated to modbus TCP), or do I have to make a specific python file for modbus TCP that works with modbus TCP?
So are the RS485 meter protocols also available for Modbus TCP devices, or does the GX only apply them to physically connected RS485 meters? so another modbus TCP client would work on the GX RS485 port? I prefer only using modbus TCP!
Any help would be great. Thanks in advance.
Best regards,
Mark