I also managed to successfully connect my Sugar Valley Oxilife 2 to my Home Asssitant. There was a question in this thread whether the Oxilife can supply power to the ModBus/RS485 interface device. I measured it and tried it out and can confirm that this is possible. So here is my set-up:
As ModBus/RS485 interface device I’m using the HF5111S from hi-flying.com, here is the overview of their serial server devices: Ethernet Serial Server. You’ll find this in the internet for around 33,-€ incl. shipping:
This one is connected to the EXTERN connector on the Oxilife motherboard:
in the following way:
