RE: [CAD_CAM_EDM_DRO] Parallel Port Interface

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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