Re: [CAD_CAM_EDM_DRO] Re: Clarifications needed -

> > Now I'm confused.
> > I thought it was either ground from the parallel
> > port, or +5V from the compueter power supply?
>
> When a pin goes high it is at +5V (well it should, but some systems
> don't make the full swing), but there is not enough current from the pin
> for more than one LED. G201s are wired to use a common +5V and switch on
> the LED in the opto when the pin goes low and current flows to it.
> G210's can be set up to use the current from the pin with a common
> ground.