maybe I'll get answers here, the service in Germany doesn't really help me.
I own a Foxess T10-G3 inverter where I would like to use the meter function
to see the energy consumption also in the app.
I bought a DTSU666, the version with the external current sensors.
I set the DTSU666 according to the instructions for Foxess inverters.
The meter function is activated in the inverter and the export limit is deactivated.
All cables are correctly connected (R485) the DTSU666 shows the correct values on the display
only the inverter shows strange values (such as 300W although 4 kWh are consumed)
and also regulates the PV power down to the value.
sorry because my english is not good, i let google translate it
sadly I can't answer your specific question but would refer you to these if you have not seen them already which shows the wiring and setting of the 3 phase meter.