Re: [CAD_CAM_EDM_DRO] Gekkos

Gene wrote:

> Why would the computer send signals if its turned off? it doesn't do it
> if I disconnect the parallel port cable at the gecko box.
> Jon Elson wrote:
> >
> > Gene wrote:
> >
> > > I just changed my motherboard and everything works fine with BDI and
> > > Gecko 201. But when I turn the power off to the computer one axis creeps
> > > slowly With no way to stop it except turn the power off. is this normal?

You must be getting +5 V power from an external power source, and
the output drivers in the computer's parallel port are protecting themselves
by shunting external voltage to ground. The protection circuits may be
allowing a marginal current to flow through the opto-isolators, such that
the Gecko senses a step pulse part of the time, and no step pulse at other
times. this would cause the drive to move on its own.

Jon