Well, I've wired the NC loop for the home switches, the loop is powered by the same 5v power supply that powers the breakout board. The breakout board pin 15 led is lit when the switches are inactive and when any switch is opened the led goes out on the board. It is an optoisolated input. On the Mach 3 configuration page I enabled x,y,and z home(s) for pin 15 and tried setting active low and high for them but I get no light (or the light does not turn off) with either setting from the m1 m2 m3 home indicators on the diagnostics page when these new home switches are operated. I can only conclude that either there is a problem with the breakout board, parallel port or hopefully just PC configuration. pin 15 is not enabled for any other I/O in Mach3. Is there any difference in parallel port pin 15 that might require some programming in either Mach or the PC bios? I know there are PS2 EPP and ECP type parallel ports, but don't know what I have, if they can be set, or if it makes a difference in this case...or am I missing something else?
thanks
tom