Quote Originally Posted by AndrewMawson View Post
Yes Clive just the one relay, which I can connect to any of the three relay output contacts of the BOB.

I am unclear how Mach treats these outputs. Is it by M code, do I need to write a diddy bit of code or what?
You need to allocate the output pin to an output in ports and pins, then activate that output either via an M-code, or via a Macro. I think you may be able to do it via the macropump by monitoring when certain things are active i.e. when the torch is active, but hopefully DaveK will be along shortly and tell us how he activates his extractor.