It seems the DNS for https://devantech.co.uk and http://www.robot-electronics.co.uk/htm/usb_rs485_tech.htm aren’t working, and I haven’t been able to find another way to contact them. I also can’t find documentation for their USB-to-RS-485 adapter.
Does anyone have a copy of the schematic? Thanks!
UPDATE: Seems Google’s DNS server is failing on this one, but others work fine. Crisis averted.