Re: [CAD_CAM_EDM_DRO] Re: Parallel Interface-Breakout Selection

Charge pump is a very nice feature found in Mach2. If used properly, it
prevents your outputs to things like power to spindles from coming on when
Mach2 does not have control.

Optical isolation when using the Gecko type drives is important as it allows
you to separate your grounds. You want the PC ground to be separate from
your controller ground.

On input optical isolation is also important. One added benefit for limit
switches is that an optical isolator will help eliminate the false triggers
that some users have a problem with.

Bob Campbell
Bob@...
www.campbelldesigns.com
Breakout board
THC board sets
CNC router plans
Stepper Motors

----- Original Message -----
From: "efoda5446" <efoda5446@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Friday, March 12, 2004 2:47 PM
Subject: [CAD_CAM_EDM_DRO] Re: Parallel Interface-Breakout Selection


> i'm not exactly sure i understand the whole relay bit when it comes to
> auxilary switching outside of just wiring up your drives. why would
> you need that? the problem i have looking at the features and
> comparing is none of them say,"this feature does this so you can do
> this, etc." like, what the heck is a charge pump (i guess, if i don't
> understand it i probably don't need it, though ;) and what's the
> benefit of opto isolated outputs?
>
> i think choosing one of these will probably work just fine but are
> there any other boards to look at, that anyone could suggest, or are
> these pretty much the options.
>
> thanks your guys' input has been great!
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, Les Newell <les@l...> wrote:
> > This is my personal opinion of these boards. Your mileage may vary :
> -)
> >
> > > http://members.shaw.ca/axxus/db1v20.htm
> > This is basically a terminal block with a few pullups and a 5V
> supply.
> > At $60 this seems a little steep, especially once you add a relay
> board,
> > and power supply.
> >
> > > http://www.pmdx.com/PMDX-120/index.html
> > Very configurable. Buffered outputs and opto isolated inputs. 4 on
> board
> > relays for auxiliary switching. This is a nice board. Opto isolated
> > outputs and the ability to handle the Mach2 charge pump feature
> would
> > have been nice. Also there is no provision for PWM spindle speed
> control.
> >
> > > http://www.campbelldesigns.com/breakout_board_plus.htm
> > Similar to the PMDX board but no auxiliary relays. It does however
> > support the Mach2 charge pump. LEDs on every line are useful for
> > testing. No PWM spindle speed control yet, though one is apparently
> in
> > the pipeline(has been for quite a while now).
> >
> >
> > If I was buying a board I think I would go for the PMDX-120. It
> looks to
> > be the best value for money. If you want a 5th axis you are probably
> > best off using a second parallel port. You can fit 5 axes on 1 port
> but
> > you end up running out of outputs for auxiliary switching.
> >
> > Les
> >
> >
>
>
>
>
>
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