Re: [CAD_CAM_EDM_DRO] Re: Interface on low-cost linear scales?

On Wed, 5 Mar 2003 halle@... wrote:

> Hi Tom.
>
> My scales are the digital-out type and I knew the functions on the
> differnet pins but couldn't figure out what the bits meant. It was maybe
> something wrong with my oscilloscop (digital memory type) or the wiring
> when I analyzed the signals, I ddn't get any stable readings (different
> bitpatterns with the same readings on the scale). But I think I found
> what I needed in the Caliper_Info files.

The values will fluctuate a little bit with no movement of the scale. I
built a prototype readout circuit for mine that displays in
ten-thousandths (.0001") and the last digit is usually not too stable.

C|

>
> /Halle
>
> ----- Original Message -----
> From: <mayfiet@...>
> To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> Sent: Tuesday, March 04, 2003 5:25 PM
> Subject: [CAD_CAM_EDM_DRO] Re: Interface on low-cost linear scales?
>
>
> > The vast majority of Linear Scales, output
> > a quadrature signal, either Analog or Digital.
> >
> > Most Digital Output units will have 4 wires...
> > Gnd, +5V, A Output and B Output.
> > The outputs being standard logic TTL or CMOS
> > levels.
> >
> > The Analog units can have 4 but usually 6 wires.
> > Gnd, +Vcc, A+ Output, A-Output, B+Output
> > and B-Output
> >
> > Analog levels can very from microvolts to
> > several volts. These are usually sine waves.
> > Some are Open Collector Outputs, so if you
> > apply power and still don't read an output,
> > you may have to use pull-up resistors.
> >
> > In either case your going to have to figure
> > which pins are Gnd and Vcc first.
> > This will probably require opening up one of
> > the units and figuring it out or drawing a
> > schematic.
> >
> > Also there might be a clue as to the
> > manufacture on the circuit board.
> >
> > Good Luck
> >
> > Tom M.
> >
> >
> >
> >
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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 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
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> List Owner
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> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
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