Proximity Sensors / Mach3 not showing

[cropwell]

This is just as unlikely to work as the problem could be switching reliability at the 5v end of the operating supply voltage range. The BoB I use is voltage switchable would not run the sensors at 5v and so the inductive switches now operate at 12v. I would never advise going directly in to a printer port, unless you have a ready supply of spare computers.

Cheers,

Rob - A man of great girth.