CircuitPython on the P1AM-200 can support Modbus TCP (server and client) and Modbus RTU, but there is no production-ready, turnkey library today. The most viable path for your pyrung project is to ...

Small Python scripts for reading data from SAJ H2-series inverters via Modbus TCP. I put this together because my inverter doesn’t expose its web UI and I didn’t have physical access to it for a while ...