!need Help CNC6040Z USB Limit switch wiring!

[Schematicsman]

So magicniner yes the cable is parallel to usb one end connected to JP board in black box and the other end usb to my laptop so how and where would I be able to download the cnc6040 xml plugin that is needed to get this machine working with Mach3????Please help because If I cant get it to work with my laptop usb connection, I doubt the desktop pc would even work with the same usb connection.

I tried connecting 2 limit switches in series Normally closed to the appropriate pins Clive mentioned and in the inputs tab and enabled X+ X- Y+ Y- and green ticks on Active Low and there was no response on the diagnostics page I even tried Automated setup of inputs and no response ever.So I dont know what to do nothing seems to want to work.But thank you and everyone for all their help.i continue to read the manual And hoping to get some function if I can:)

My laptop is a ::::
Dell D620 2Ghz processor
With serial db9 connection and no DB25 parallel connection ....on the back if that helps