Re: Pullup resistor on a NC touch probe, Mach3?

Thanks Arnie.

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Arnie Minear" <aminear@...>
wrote:

>
> Monte,
>
> The input pins will normally float high by themselves. You can try to
> hook it up with just the NC probe and no pullup resistor.
>
> There is no danger involved with directly connecting your input pins
> (10,11,12,13,15) to your parallel port common (pins 18 through 25).
>
> If that proves unreliable, then you can pull it up with a pullup
> resistor to a +5 volt supply. This is where you can damage your
> parallel port. To be on the safe side you will need to install a
> current limiting resistor in series. Here is a good tutorial on the
> parallel port
> http://www.epanorama.net/circuits/parallel_output.html#circuithow
>
> Arnie
>