Re: [CAD_CAM_EDM_DRO] Re: Shared Direction pins vs dedicated Direction pins

Its fairly easy to write an app for DOS using WATTCP for network.
They have high level calls with sockets.
Very fast.
Alex

----- Original Message -----
From: Tony Jeffree <tony@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Wednesday, February 12, 2003 10:00 AM
Subject: Re: [CAD_CAM_EDM_DRO] Re: Shared Direction pins vs dedicated
Direction pins


> I'm amazed that there aren't solutions readily available that use Ethernet
> connections rather than the parallel port.
>
> Regards,
> Tony
>
> At 14:52 12/02/2003 +0000, you wrote:
> >Bernard,
> >
> >Ditto.
> >
> >And even though the p-port is disappearing,(but will not "really" be
> >gone for awhile) the current crop of pc-based cnc controllers is
> >including support for additional i/o with the use of another p-port,
> >or support of generic i/o cards, or usb, game port or otherwise...
> >
> >In other words, it's a solution in search of a problem, IMO.
> >
> >Ballendo
> >
> >P.S. But a neat idea!
> >
> >--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Bernard R
> ><bwjarandall@c...>" <bwjarandall@c...> wrote:
> > > --- In CAD_CAM_EDM_DRO@yahoogroups.com, Doug Fortune <pentam@c...>
> > > wrote:
> > >
> > > Doug,
> > >
> > > While there is no technical difficulty doing time division
> >multiplex
> > > with muliple controllers, I don't really see the need. The current
> > > limitaion is using a single parallel port as the computer
> >interface.
> > > From what little I've seen the G2002 project is well in hand so the
> > > limited output pins should soon be history.
> > >
> > > From the practical side I could see a lot of people having problems
> > > with the concept and trouble shooting such a system would be a
> > > nightmare for the average hobbyist with limited technical knowledge
> > > and virtually no test equipment.
> > >
> > > Bernard
> > >
> > > > re: dedicated Direction & Step pins need 2*N output lines
> > > > vs shared Direction & dedicated Step pins need N+1 output lines
> > > > (N is number of axes), thus saving output pins which are limited
> > > > in number on a parallel port, and hence often a constraint.
> > > >
> > > > Chris L wrote:
> > > >
> > > > > >>It would appear to be for some type of "single axis at a time
> > > positioning"
> > > >
> > > > Doug wrote:
> > > > > >Absolutely not!
> > > > > >This is a general scheme for lathes, mills, routers and
> >hexapods
> > > >
> > > > > Maybe by a "hand cranker".... but, On a CNC mill or Router ??
> > > Now I am
> > > > > lost..... Even on my simple 3 axis router, I assure you I can
> >and
> > > do
> > > > > have more than one motor turning, and in opposite directions at
> > > any
> > > > > given time, even for simple 2d profiles.
> > > >
> > > >
> > > > Hi Chris:
> > > >
> > > > Yup, lots of motors turning simultaneously at different speeds,
> > > > accelerations and directions, thats how S&D motor drivers work
> > > > (as you well know!).
> > > >
> > > > Yes, I think you are missing something obvious.... the Step
> > > > signals to the motor drivers are of the order of 1 uS (1
> >millionth
> > > > of a second). Apparent smooth motor motion results from emitting
> > > > one of these pulses (say 20,000 times/sec or once every 50
> > > millionths).
> > > >
> > > > In other words, you could have many (50 channels in this example)
> > > > sharing a common direction pin, and neither the motors nor the
> > > human
> > > > would be able to detect any measurable difference. However the
> > > Geckos
> > > > (much as I like them) have a hold-time constraint on the
> >Direction
> > > line
> > > > which precludes their use in a "shared-direction" scheme.
> > > >
> > > > <more written offline to Chris>....
> > > >
> > > > Doug Fortune
> > > > http://www.cncKITS.com
> >
> >
> >Addresses:
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> >
> >OFF Topic POSTS: General Machining
> >If you wish to post on unlimited OT subjects
> >goto: aol://5863:126/rec.crafts.metalworking or go thru Google.com to
> >reach it if you have trouble.
> >http://www.metalworking.com/news_servers.html
> >
> >http://groups.yahoo.com/group/jobshophomeshop I consider this to be a
> >sister site to the CCED group, as many of the same members are there, for
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> >
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> Regards,
> Tony
>
>
>
> Addresses:
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timg@...
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> URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
>
> OFF Topic POSTS: General Machining
> If you wish to post on unlimited OT subjects goto:
aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if
you have trouble.
> http://www.metalworking.com/news_servers.html
>
> http://groups.yahoo.com/group/jobshophomeshop I consider this to be a
sister site to the CCED group, as many of the same members are there, for OT
subjects, that are not allowed on the CCED list.
>
> NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM.
DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
> bill
> List Mom
> List Owner
>
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>