Capability of using many energy meters on the same USB/RS485 interface

Modifications
1

Hi,

I bought 4 energy meters ET112 for a better understanding of my cusumption and was surprised when I tried to connect them on the same RS485 bus because we cannot define the slave address of meters on Modbus RTU.

After many research, I found out the problem come from dbus-cgwacs module and exactly, in ac_sensor_mediator.cpp file.
In AcSensorMediator::AcSensorMediator constructor, there is a loop for (int i=1; i<=2; ++i) that limit to sensors having slave address 1 or 2.

A minimal and simple improvement could be to increase this number from 2 to 10.
And an even better solution but more complex could be defining slave addresses in a dbus-spy setting.

For my use, I tried to build a dbus-cgwacs executable but I stopped on way because it’s not simple to create a build environement when we are not use to it.

For the next release, could you increase the number in the loop
=> change for (int i=1; i<=2; ++i)
=> to for (int i=1; i<=10; ++i)

Thanks a lot,
David

2

Its in the manuals of the energy meters… max is two on 1 line, but you need to change the adress with carlo gavazzi software…

3

I didn’t see that but anyway, it could be 10 on one line just by changing a value in ac_sensor_mediator.cpp.

4

Hi David, interested to know how far you got with this? I’d love to be able to run 4 or 5 of this ET112 on one RS485 bus. Is it a simple setting change or does the software have to be recompiled or?
Thanks.

5

Dont think it can be done, the complet modbus adress list from victron would need to be adjusted since adres 3 and up are already in use

https://www.victronenergy.com/upload/documents/CCGX-Modbus-TCP-register-list-3.50.xlsx