Hi community,

I got a CNC 3040 and I am trying to add limit switches and a Probe (tool height).
Once I popped open the controller box, I saw that I have a different design than what most of
my search findings. (perhaps that is a good thing as most of those boards have bad components that needed fixing!)

After much research on the PCB model I could find this page:
http://item.taobao.com/item.htm?id=21278176969

and another page that is a company which I emailed twice with no response.

Clearly the lower left pins are used for the limits and probe. (I could see writing on there saying X+ X- ...)
My continuity test failed to match any of the LPT pins, after reading the aforementioned page, it mentions using 74HC amp chip which I think
that is why I couldn't pin point which pins go where.

Thought about asking on the forums if anyone has any experience with this board before I go probing deeper and potentially get into trouble.

Thanks for your help.

NOTE: I also put in the photo for the spindle controller, perhaps someone knows something about it, I would love to do PWM from Mach3 or LinuxCNC (EMC2)