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General Mach Discussion / Re: active low with nothing wired to my board
« on: February 10, 2006, 05:28:36 PM »
I was trying to use a normally open switch and wire it ground so it would go low when hit. I have active low state on those pins before I even touched them. I thought that their normal state is high, I thought that there are internal power source in the port at bring them up to 5 volts. I am confused? I was going to wire all limit/home switches to their own pins and all other limit switches to the same pin leaving 1 pin for the estop. I guess my question is why are some of my pins showing low to Mach3 and others are not? Could I have a bad board or am I missing something?