Re: [CAD_CAM_EDM_DRO] Parallel Port Interface

Hi Bryan,

Sure,

High-speed parallel line extender model 1042E

Bravo Communications Inc. 1310 Tully rd. San Jose, CA 95122
408 297 8700

They are straight through transceivers, and not opto-isolators, but do
provide good drive for longer cables, and some protection. Comes with a
9V 1A wall wart.

I don't know what the list price is, but I have a source. ;>)

Gail & Bryan Harries wrote:

>
> Alan,
> Can you supply any more info on this port extender?
> Part number, supplier, link, etc...
> Sounds like they would be handy to have in the experimenters tool kit...
>
> Thanks for your time to follow up...
>
> Bryan
>
> -----Original Message-----
> From: Alan Marconett KM6VV [mailto:KM6VV@...]
> Sent: Saturday, 03 November, 2001 2:39 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: Re: [CAD_CAM_EDM_DRO] Parallel Port Interface
>
> Hi Gary,
>
> What do your drivers have? If they already have opto's, you don't need
> to add them! Some parallel ports may need a little pullup for the limit
> and probe sense switches. I like to use a BRAVO Communications Parallel
> port Extender to provide some isolation and protection with MaxNC's
> 4-phase driver board.
>
> HTH
>
> Alan KM6VV
>
> Gary.Rose@... wrote:
> >
> > Hi,
> >
> > I'm putting together a small cnc system (Sherline based) and am at
> > the point where I'm thinking about how to connect the parallel port
> > to the stepper drivers, limit switches, manual jog controls, etc.
> >
> > Some schematics that I've found on the web show the step and
> > direction and other lines directly connected to the parallel port,
> > others use optoisolators (4N33 for example), others just have pull up
> > resistors, still others use buffer gates.
> >
> > Any thoughts? I'm leaning toward optos, because that's what I know,
> > but what do you guys think? Is it worth the trouble or not?
> >
> > Thanks
> >
> > Gary
>
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