Re: [CAD_CAM_EDM_DRO] Re: step dir inputs on Gecko Bridgeport saga

Geckos have the current limiting inside, all that is required is +5v and
gnd.
Jim

----- Original Message -----
From: "Keith Clark" <mail@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Tuesday, September 07, 2004 7:18 AM
Subject: [CAD_CAM_EDM_DRO] Re: step dir inputs on Gecko Bridgeport saga


> Andy, It worked nicely when connected to ground but without the
> resistor.
> Keith Clark
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, Andy Wander <awander@v...>
> wrote:
> > But, unless he switches it to ground, the optocoupler will never
> light(+5V
> > is the "common")
> >
> > Andy
> >
> > -----Original Message-----
> > From: Jon Elson
> > To: CAD_CAM_EDM_DRO@yahoogroups.com
> > Sent: 9/7/2004 1:10 AM
> > Subject: Re: [CAD_CAM_EDM_DRO] step dir inputs on Gecko
> Bridgeport saga
> >
> > JanRwl@A... wrote:
> >
> > >In a message dated 9/6/2004 8:07:29 PM Central Standard Time,
> > >mail@t... writes:
> > >Any suggestions?
> > >Yes. The "logic level" must go "hard" to ground. Just opening
> the +5
> > VDC
> > >source doesn't do it, as the "internal stuff" in the IC where the
> gate
> > involved
> > >connects will often "pull up" the input line (though not
> ideally).
> > >
> > >Suggest you connect the +5 to this DIR input via a 1K resistor,
> and
> > then that
> > >same point to GND via the switch. The switch, then, will make
> this a
> > "hard
> > >LOW" when closed, and a "pulled-up +ve" when open.
> > >
> > >
> > No, not needed with the Gecko drives. They have optocouplers of
> the
> > 2531 variety
> > that require about 15 mA to turn on. So, opening the connection
> will
> > guarantee
> > the LED is off. What you say is totally correct for a logic gate,
> > especially a
> > CMOS gate, which can stay charged for days.
> >
> > Jon
> >
> >
> >
> > Addresses:
> > FAQ: http://www.ktmarketing.com/faq.html
> > FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
> > Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com
> >
> > Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
> > Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
> > List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com, wanliker@a...,
> > timg@k...
> > Moderator: pentam@c... indigo_red@q... davemucha@j...
> > [Moderators]
> > 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
> >
> >
> > Yahoo! Groups Links
>
>
>
> Addresses:
> FAQ: http://www.ktmarketing.com/faq.html
> FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
> Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com
>
> Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
> Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
> List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com, wanliker@...,
timg@...
> Moderator: pentam@... indigo_red@... davemucha@...
[Moderators]
> 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
>
>
> Yahoo! Groups Links
>
>
>
>
>
>