ASN
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ASN got a reaction from iiznh in RS485 to PI cable confusionI decided in the end to chop up an Ehternet cable as originally suggested, wired into the pins as suggested.
Easily done, and immediately picked up in home-assistant.
This stepped is glossed over (arguably because it's so easy in reality).
The steps are:
1 - cut end off ethernet cable
2 - strip wires on pin 1/2/3
3 - connect wires to modbus serial usb converter
I think a lot of the issues/posts i see in other threads relate to not knowing if the home-assistant is ready to collect the data, and therefore it could be eiter cable/software config/converter.
For me, starting with a cable guaranteed to work meant it was just plug and play.