It's got 5 pins, and a push switch so 2 of those are for the switch. This leaves 3, which I assume are 2 quadrature outs and the common. You'd have to add logic or something like a PIC to that to get a parallel digital output. I assume the 30 position are the detents. I could be wrong of course, be nicer to have the actual mfr spec, but I wouldn't start with this in any case.
Those won't work. They are not binary encoders, they are pulse encoders. I'll say it again... 8-position, real code, binary encoder.
https://www.pedalpcb.com/product/mini-1p8t/. You previously wrote that this key would be used from another site. Can I use that then? But it doesn't seem like it's an encoder.
As I said at the time, that can be used if you add all the diodes of the original schematic. Order the board from pedal PCB and use that, not my board. Or hand-wire in the diodes on the switch. We're going around in circles.
We ordered your card, it has not arrived yet, I will add the diodes as you said, thank you also for your card, best regards.
Use what ever you want.