I'm trying to read some registers (e.g. InvTemperature) of my FOX ESS S2500-G2 Inverter.
The setup is relatively simple:
1) 16-pins COM port of the S2500 is using pins 1 (A+), 2 (B-) and 6 (GND) (conform FOX S2500-G2 Use Manual)
2) Connected via CAT6 wiring pairs to a Waveshare USB to RS485 presented as COM3 on Windows 11
3) Using "mbpoll -a 1 -b 9600 -d 8 -s 1 -P none -m rtu -t 3 -r 28 -c 1 COM3"
Which returns this error:
I've tried several different settings like slave ID 247, inter changing PIN1 and 2 and other register numbers. I even measured the voltage of the PINs to exclude wiring faults. Also using different tools like QModMaster gives exact same error.Read input register failed: timed out
I extracted the Register information from a Chinese FOX document that I received from FOX Support that I translated to English; so I'm not exactly sure if Input Register 29 of 28 is correct. However, I think I'd receive a return error other than "Timeout" when reading a wrong register?
Anyhow, I can't think of why or where this is going wrong or how to troubleshoot this further…
Anyone with some fresh ideas?
Background info: this is a test setup. Ultimately I want to use HomeAssistant to set an Export Limit register to prevent feed-in charges.