Well Doddy said I would be back - and here I am.

Some of my toolpaths take a day or so to run and I want to turn a compressor on for certain operations to blow away the swarf, hopefully using M8/M9. To slightly complicate things the compressor in the workshop is currently wired with a 2 way switch so it can be turned on and off from either upstairs or downstairs and I need to keep this fuctionality.

Can anyone suggest a wiring circuit that would enable my AXBB_E controller to seamlessly turn the compressor on and off?

Hope this makes sense and looking forward to suggestions.

Carl