You are correct so far(;-) The active low needs to be the RED X that will make it active High.

You can test this on the diagnostic page. There is a LED that shows the state of the enable1 output pin.

When Mach is normal the led should be ON and when you put it into reset it should go OFF.

Remember on the alarm side of the relayy when you wire it up PLAN to put a disconnect switch inline to be able to shut off this function. IF not then when you first fire up the system the alarm will turn on untill you come out of RESET and when you shut it down the alarm will ALSO turn on.

(;-) TP

Excellent info!
I'm glad I'll be able to check the operation on the diagnostic tab.
And thanks for the reminder on the in-line switch...
I'd actually thought of that myself, but it's a great reminder!
There will now be a several day pause until I get my relay driver board...
Chet

Success!!!!!
The C-37 single relay board from cnc4pc.com is an excellent little unit.
No 10k pull-up was necessary!
Pulled 5 v off the HobbyCNC board to power it, and attached the input to pin 14.
Wired the vac in on the NO pins of the relay.
Didn't need an extra in-line switch as the vac already has one!
Sweet!!!!!
Thanks to every for their suggestions!
The idea of turning something off as an alarm was a stroke of genius!
Many thanks to all who participated!

Congrats. Chet !
Glad it worked out well for ya.
Russ

Good Job(;-)

(;-) TP