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General Mach Discussion / Re: Is "GND" in the manual Common and +5v on the ZP5A-INT breakout board? (please!)
« on: February 07, 2014, 03:09:50 AM »
It is not uncommon for a board to incorporate 'pull-ups' to +5V on all inputs. The limit / home / estop switches are usually 'n.c' and pull the input to GND so Mach3 is configured to have the used inputs configured as 'active high'. This way the used inputs are held at GND by the switches but when a switch is activated the input rises to +5V.
Hope this helps.
Tweakie.
Hope this helps.
Tweakie.