@Sean the schematic indicates the DSU666 is connected to the 3x Huawei 6KL inverters.
The ET112 is currently not working. It is connected as the last device (before the tails) and I have the RS485 installation completed as per the docs and wiring over Cat6E running ~60M (tested voltage on D-, D+ and continuity on GND to validate) which goes into an RS485 <> USB adapter. Termination has been completed on the ET112 Afaik it’s pin 4 and 7 or something? Either way it’s done as per docs.
The light on the ET112 is a solid green indicating correct comms w/ the RS485 <> USB however nothing shows up in Settings > IO OR Settings > Energy Sensors.
I have another thread which is exploring the issue w/ the ET112. I’d appreciate more eyeballs and help if you have experience 