Compatible RS485 Adaptors
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Amazon UK Link1, Berrybase Link1
Whatever adapter you buy, make sure it supports modbus transmission. Transparent adapters that do not look into the modbus protocol cannot send the packages to the correct modbus slave.
Older version of the USR-N510 with DB9 connector supporting RS232/RS485/RS422
Only ethernet mode tested so far.
More information on this adapter can be found under Installation Notes
Amazon UK Link1 , Amazon UK Link2 , Amazon UK Link3
Newer version of the USR-N510 without DB9 connector supporting RS485 (Specs mention RS232/RS485/RS422 Optional)
Should perform the same as the older version, although untested!
As this Model appears to only gives you a Virtual Com Port it might prove difficult to pass into Home Assistant running in a VM or Home Assistant OS?
This RS485 adaptor is very problematic:
- There seems to be delayed communications,
- Struggles to read more than 7 registers at a time,
- Modbus Error: [Input/Output] Unable to decode request,
- No ability to set "Auto query storage type" for Sofar Inverters.
Not to be confused with the DIN Rail mounted Waveshare RS485 TO ETH (B) mentioned above.
- This adaptor does not support "Modbus Transmission" it is a passive device.
- You can't submit requests to the Inverter.
- It does not work!