Re: Digital Caliper Output

Thanks but I already have the article.

The SPC is very slow. You can only get 2 output per second or so out
of it. The clock pulses are at 1.6 ms and it has to send 17+ Bytes of
info for the entire output.

This would be fine for a simple DRO but not for a CNC conversion.

Thanks for the help though!

--- In CAD_CAM_EDM_DRO@egroups.com, "Lee Studley" <indigo_red@u...>
wrote:

>
> Hi,
> CircuitCellar.com had an article years ago on getting the serial
> output(usually implemented but not always brought out to a

connecter)

> on these digital calipers. there's usually pads to get to the
> data output if I remember clearly. The format needs to be

reformatted

> I think...
>
> I'll search their site to try to get the article, or pdf a copy of
> the
> issue in my storage. Might take a couple of days till I get to it.
>
> -Lee
>
>
>
> --- In CAD_CAM_EDM_DRO@egroups.com, Jon Elson <jmelson@a...> wrote:
> >
> >
> > bcollier@p... wrote:
> >
> > > I wonder if the half-thou digit toggles between 0 and 5 in real
> time.
> > > You could tap into the LCD and read, say, the lower left line

in

> the
> > > tenth place. If it is real time, you would get a square wave
> pulse,
> > > high every half-thou. Any thoughts?
> >
> > They don't work that way. About 500 times a second, the chip
> selects
> > one digit
> > at a time and sends the 7 segment drive signals to it. Then, it
> does
> > the next
> > digit. Even if what you suggest was how it worked, you would

have

> lost
> > direction of travel information.
> >
> > Yes, you could pick up all the digits and de-multiplex them, and

get

> > faster readout
> > than the spc port, but I'm not sure it is fast enough, still.

But,

> > you'd get about
> > 60-100 full updates/second.
> >
> > Jon