Re: [CAD_CAM_EDM_DRO] Re: Geckodrive asking for user input

Mariss -

Is there a possibility of an option #3 that allows selection of +ve or gnd
as common, as currently provided on the G210? You could default to gnd
common but for the people that need plug-in compatibility with older
equipment they could switch the links around.

Regards,
Tony

At 05:11 06/07/2006, you wrote:

>The 3.3V thing with new PCs has been a real headache. Some of our
>drives "sort of work" at 3.3V, others flat-out do not. Both working
>and non-working drives are being operated completely out of spec.
>
>The typical support exchange for this begins with "I got 3 of your
>drives. One works, the other 2 don't. What's wrong with them?". Well,
>what's wrong is they are not designed to work with 3.3V signals.
>
>Normally I stick with 100% backwards compatibility with any new
>design but this 3.3V/5V thing is a real and growing headache. It's
>very tempting to make it all go completely away using option 2.
>
>I don't normally design by poll but I do need to know who if anyone
>would be negatively impacted by the proposed change. It's a real
>tossup.
>
>Mariss
>
>
>--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Bob Muse" <mtebob1@...>
>wrote:
> >
> > Hi Mariss
> >
> > Just judging by the debate that comes up every so often with
>regards to the confusion generated by having the common terminal tied
>to +5 volts, I think I would opt for #2. It would simplify things
>for a lot of people. Just my 2 cents.
> >
> > Bob Muse
> > Machine-Tech Engineering
> >
> >
> > ----- Original Message -----
> > From: Mariss Freimanis
> > To: CAD_CAM_EDM_DRO@yahoogroups.com
> > Sent: Wednesday, July 05, 2006 8:12 PM
> > Subject: [CAD_CAM_EDM_DRO] Geckodrive asking for user input
> >
> >
> > Hi,
> >
> > I'm cross-posting this everywhere because I need a lot of replies
> > fast.
> >
> > I'm nearly done with a G201/G210/G202/G212 replacement design
>called
> > the G203 for right now. It is a complete, clean-sheet CPLD based
>new
> > circuit. Same size and pinout as the G201 drive but a whole lot
>of
> > new features.
> >
> > Here's where I need input. The G203 uses 3.3V logic which makes
>the
> > step/direction opto-solator interface require much lower current.
>The
> > quandry:
> >
> > 1) Be 100% backwards compatible with the existing drives. That
>means
> > supplying +5VDC to the COMMON terminal and require 5VDC
> > step/direction signal levels. The G203 would keep an unplug and
> > replace compatibility with our current drives.
> >
> > 2) Change the COMMON terminal spec from +5VDC to GND. The G203
> > requires only 2mA max to operate step/direction optos instead of
> > 16mA. The G203 has a max step pulse frequency of 350kHz (>10,000
>RPM
> > on a 1.8-degree motor) without any funny G201 step/direction
>timing
> > restrictions.
> >
> > The result is supply step, direction and PC ground to the G203
>and it
> > will run. It will work now with 3.3V or 5V logic; no level-
>shifting
> > breakout boards are required, no +5VDC supplies.
> >
> > Please let me know: Option (1) or option (2). The first 1,000
>boards
> > must go to the PCB fabrification house Monday.
> >
> > Mariss
> >
> >
> >
> >
> >
> > __________ NOD32 1.1419 (20060226) Information __________
> >
> > This message was checked by NOD32 antivirus system.
> > http://www.eset.com
> >
> >
> > [Non-text portions of this message have been removed]
> >
>
>
>
>
>
>
>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
>
>
>
>