Duet3 + SBC (Timeout while waiting for transfer ready pin)
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@andywm Thanks for the follow up, and glad it's working for you now. For some reason it used to work with the older, longer ribbon cable (and sometimes quite a lot longer cables), though I can't say we've tested it recently, and now generally recommend a shorter cable. It may just be down to cable quality, and how good the connection is between the ribbon wire and press-on connector, as they rely on a small 'fork' cutting through the ribbon wire insulation.
I've added a fair amount of notes to the troubleshooting page, including links to loopback tests for Duet and SBC, which should help narrow down where the issue is.
Ian