Re: Question:Parallel interface with Gecko 201 drivers

Actually, Tim is right on the money here - I think he was giving you honest
practical advice, not sarcasm. And from my reading of his past posts, his
advice is generally worth listening to.

But to answer your question, twisted pairs are usually used to carry the
source and sink of a signal - so that any induced voltage in one half of
the pair is near enough cancelled by a corresponding induced voltage in the
other half. So no, the choice would not be to put 2 signals in the same
pair, regardless of what they were, but to pair each signal with its
reference voltage or ground. However, as Tim observes, you may find that
this is not a practical necessity.

Regards,
Tony

At 08:36 12/10/2002 +0000, you wrote:

>I hope that I dont have aproblem with RFI. But in the case that I
>do, I just want to be prepared.I see nothing wrong with that.
>Im here to LEARN, as most people are. And I still have unanswered
>questions that Im hoping that someone will help me with.
>Is anyone willing to answer these questions the best that they can??
>Preferrably without the sarcasm.
>
>Thanks
>
>
>
>
>
>--- In CAD_CAM_EDM_DRO@y..., "Tim Goldstein" <timg@k...> wrote:
> > Glad you have not gotten around my machines to tell them how their
>wires
> > must me. The parallel cables I have used and the ones I have cut
>apart
> > (cheapest I can find in both cases) are not twisted pair at all.
> >
> > You are taking some best practices guidelines and solid solutions
>IF you
> > have noise problems and trying to make it the requirements for
>wiring.
> > In most cases it just ain't that critical.
> >
> > Tim
> > [Denver, CO]
> >
> >
> > > -----Original Message-----
> > > While using a breakout board is probably the best way to go, i
>find
> > > myself wanting to make my own cable for the pure satisfaction of
>it
> > > and the learning experience..
> > > Heres what i know about cabling from parallel port.....
> > > The wires must be in twisted pairs.
> > > The step/dir wires must not be in the same twisted pair.
> > > The length should be no more than 12 feet in length.
> > > Any power derived from the controller source must be seperate
>from
> > > the step/ dir wires. Prefferably as far away as possible.
> > > The wires must be of a shielded kind.
> > >
> > > My question is this....
> > > If the step/dir wires can not be put in the same twisted pair,
>then
> > > what should a twisted pair consist of?
> > > Two step in a pair or two dir in a pair? Or what?
> > > If you were to make your own cable(eveen though you probably
>would
> > > opt not top do so) How would arrange the wires??
> > >
> > > Thanks again

Regards,
Tony