I have the Probeit probe and a generic z height setting tool.
Ill attached a picture of the z height tool and probe it that I am trying to use

I can not get both them to work without having to change the active low settings before using them.
If i go to ports and pins under probe with active low selected  (green check) it will work. But the z height will not when I switch the plugs from one to the other.
If i use the z height i have to have active low disable (red x )and it will work but the probe won't.

Is there something i am missing or this combination will not work.

I am milling metals  on the mill so not able to use a probe plate.

any help or a device that will work please let me know.

thanks
john

The Probe-it manual shows how to use it with an active low input.
See Section 2.1.2   http://www.craftycnc.com/download/154/
A resistor value in the range of 1000 ohms should work. The maximum value depends on the pull up resistor in your BOB input.

Thank you for the information was not sure what that all ment in the manual now I kinda of understand what I need to do.
Thanks for pointing me in the right direction.