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I have a EM24 on the USB Dongle and it workes fine. Then i added a ET112 (and changed the Modbus ID of the EM24 from 1 to 2 as described in the manual).
Now no Meter is recognised. If i disconnect one meter (EM24 or ET112) the other one works fine. So both meters are OK (and the cable too).
What can i do?
So there is no problem with the Modbus addresses
But the question is: should i regular connect the GND between the energy meters and the USB Dongle?
My configuration:
EM24 ----7m cat7 cable ---- USB adapter ---- 8m cat7 cable ----ET112
No termination, two twisted cables for A and B, another cable for GND
Yes you should run a ground that is what i have done and all woks OK.
I just used cat5 cable for mine.
EM24 ----7m cat7 cable ---- USB adapter ---- 8m cat7 cable ----ET112
this is not a good way to wire up RS485.
You need something like this:
EM24(120ohm) --- eth --- ET112 ---eth--- USB adapter.
make sure you put 120ohm resistor between A+ B- terminals at the last device (EM24).
All devices in the system should have common GND.
the devices should be daisy chained, running separate wires to the two meters and paralleling them at the usb is not a good practice and probably won't work over distance.
Hi
You need to change the ID address using the the CaloGavzz software not the Venus software.
I changend the ID directly on the Energy Meter - as described in the Victron Energy Meter EM24 RS485 manual.
I changed the IDs in Carlo Gavazzi Software and the Meters are correctly recognized, but the ET340 gets sometimes lost without any reason :(
Is the cable maybe too long. I used the original 5m one without any extension. Only cut it to passtrough to the second meter.
the GX device addressing is limited. You have two choices, simple = run two separate RS485 cables. or more complicated change the device modbus address, but set them as discussed above on the actual meter using the Gavazzi software. Install it on a laptop, plug the USB RS485 cable into the laptop, change the address of 1. You must temporarily disconnect the one meter while you programme the other. I found it here. Page is Norwegian but programme runs in English https://www.gavazzi.no/nedlasting/software/software-ucs/
