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Author Topic: Limit Switches go crazy  (Read 5917 times)

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Re: Limit Switches go crazy
« Reply #10 on: June 02, 2006, 12:39:39 AM »

I have the Bidirectrional breakout board.  On may computer all the pictures are fuzz except for the last one which is marked different than mine.  Besides the input 10 - 15 pins  is 5 volts not ground so the little E stop would be going from 5 volts to pin 10.  The pins 2-9 which are input in my case only put out around .2-3 volts.  I have tried using the normal input pins from ground and from 5 volts with the same result.

from earlier I have the SS relays hooked up as outputs for the spindle etc and they work fine.

I will look thing over again in the morning.  Keep them coming maybe we will hit on some thing.

Thanks Ryan
Re: Limit Switches go crazy
« Reply #11 on: June 02, 2006, 04:00:52 AM »

An excerpt form the .pdf installation/wiring file posted on the cnc4pc.website ...

PAGE 1 "Input and output pins with close by ground connections.
Forget about grounding problems. Easily connect your pin using your close by ground


Test the operation of the card and its connection to your computer and software before
connecting more hardware. To test output signals connect a LED and resistor between the
output pin been tested and ground, then activate the signal from your software. To test input
signals connect a wire between the pin been tested and ground, then read the input on your

This means 0V should be applied to this input.  Maybe you have a bad board?