Need help with Rotary position switch

Thanks rodw - I actually read that very post earlier.

I have not been able to do anything with a mulitmeter yet (kids) but I did notice a hint on the OEM wiring diagram - both the speed and the feed rotary switches are fed by  (or connected to) 'TB1-9' on the original wiring. It would also appear that TB1-9 is a DC COM, which would lead me to think that the other wires on the rotary switch are NOT DC COMs. 

Multimeter tomorrow.

 

Ok guys, I've got it mapped out as shown in the attached picture. The common wires are in fact the grey and white wires. My plan is to supply 24VDC to the common wires and then plug in the other wires as inputs on the 7i77 board. 

grossm5000 wrote:

Ok guys, I've got it mapped out as shown in the attached picture. The common wires are in fact the grey and white wires. My plan is to supply 24VDC to the common wires and then plug in the other wires as inputs on the 7i77 board. 
 

I wish I'd found this earlier - it would have saved me a lot of back and forth! There appear to be exactly two posts on this forum that feature real binary switches - mine and yours - and I find it confusing that this industrial standard is absent from the fund of knowledge here.

Either way, we came to the same conclusion independently, and I'm curious how you implemented the switches in LinuxCNC. I just switched to this software and I don't know what I don't know.

I am just now picking this project back up again. I'll keep on posting to this thread as I get it figured out.
I think my next hurtle is how to configure the hal file so it knows what to do with the different combination of inputs. I thought I saw something in one of the speed/feed override screens in PncConfig.

You can use the MUX16 component and assign an overall feed value to each of the 16 combinations. It's very simple: you just need to use 4 inputs on your mesa board for each rotary switch. Let me know if you need further assistance.