RE: [CAD_CAM_EDM_DRO] limit/home switches

> -----Original Message-----
>
>
> Question for you EMC guys - do the various switches need to
> be opto-isolated from the parallel port, or can the simply be
> hooked directly to their respective pins?

They can go directly to the parallel port (Don't forget the pull up
resistors). You could connect them through optoisolators if you are
worried about it.

> Does the parallel send/receive 12 or 5 volt signals?

5V

Tim
[Denver CO]

> If 12v, can one power the switches from a seperate power
> supply and hook them to the individual pins, i.e. pin 10 for
> the limit switch? I can get 5v from the same power supply
> easily enough, assuming the switches already on my mill
> (series one cnc) are 5v.
>
> Sorry for the seemingly silly questions, guys, just trying to
> figure out the rest of this EMC setup!
>
> Thanks,
>
> Matt King
>
>
>
>
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