cHi,
a pull-off distance is where at the conclusion of step 4 above the axis will then drive some nominated distance from the switch and zero it machine co-ordinate
for that axis.
Note that this is not standard Mach behavior but is offered as a functional feature of some motion controllers. To my knowledge PoKeys 57CNC certainly offers
this feature and believe that Warp9's ESS has recently had this feature added. There may well be other controllers which have it but I'm not familiar with them.
It is not a feature I've ever used or required. Even if I did a simple motion script could enact it even if your controller can't.
Mach's parallel port controller does not have this feature.
In absence of manufacturers support you are going to have to inspect even disassemble your machine to find out the wiring details and disposition of the switches.
You will also need to know the capabilities and connection details of your controller or breakout board.
I've been trying to contact the manufacturer but to no avail.
This is normal for Chinese manufacturers. If you spend a couple of hours reading posts on this forum you'll find hundreds of similar complaints. It is pretty clear you didn't do
any reading prior to your purchase and now the consequences of buying cheap will come home to roost.
Find out how the switches are wired, how the switches are arranged and the IO connections of your controller. Without that basic information I can't help much.
Craig