Mesa 7i77 Analog Enable

Thanks! That's it - the analog enable is working now.

So the CONFIG line should be:
CONFIG="sserial_port_0=100 sserial_port_1=00xxxx" which puts the 7i77 (port_0) in software mode 1 with four analog inputs.

Thanks Tommy and PCW for all your help - I would never have suspected that's where the problem lay.

What GUI are you running? You should have got an error message,
something like:

hm2/hm2_7i92.0: Smart serial card hm2_7i92.0.7i77.0.1 remote error = (30) Illegal Remote Mode

I'm using AXIS. I didn't see any obvious error message. Where would the message appear? It would be easy enough to set the config back to the faulty setting and confirm whether an error message crops up or not.