Re: [CAD_CAM_EDM_DRO] Caliper to PC interface, Part II: Data Format ?????? Help ?

----- Original Message -----
From: "Graham Hollis" <ghollis@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Friday, October 19, 2001 9:42 AM
Subject: Re: [CAD_CAM_EDM_DRO] Caliper to PC interface, Part II: Data Format
?????? Help ?


> The fact that the same display value is outputting different values is a
> problem hard to understand. It may be that the caliper has some logic to
> average the data to remove the hysterics.
> I agree with your theory that there are two sets or readings, relative and
> absolute.
> The closest I came with the data available was that that there are two 10
> bit counters starting at offset 3 and 13 with the first counter the
integer
> and the second the fraction. Each count could be .0005 which may be the
> resolution of the device. So the counters may be:
>
> .000 - 00..0000
> .0005 - 00..0001
> .001 - 00..0010
> .0015 - 00..0011
> .002 - 00..0100
>
> The negative does appear to be a 2's compliment of the counters.
> The theory seems breaks down at higher values though so the 10 bit
counters
> may be several fields of data.
> The first bit could be parity as most readings seem to have an odd numbers
> of bits.
>
> An interesting problem.
>
> Graham
>
>
> ----- Original Message -----
> From: "krlux" <lux@ca..>
> To: <CAD_CAM_EDM_DRO@ya..>
> Sent: Thursday, October 18, 2001 9:00 PM
> Subject: Re: [CAD_CAM_EDM_DRO] Caliper to PC interface, Part II: Data
Format
> ?????? Help ?
>
>
> > Here is more data.
> >
> > The sign extension on the negative numbers is a good indicator that the
> > format is a two's compliment.
> >
> > Someguy
> >
> > 0.001:
> >
> > 00 0000000000 0000000010 111010000000001110100101101 49d
> > 10 0000000000 0000000010 110010000000001110100101110 49d
> > 10 0000000000 0000000010 110010000000001110100101110 49d
> > 10 0000000000 0000000011 000010000000001110100101100 49d
> > 10 0000000000 0000000010 110010000000001110100101110 49d
> >
> > 0.000:
> >
> > 00 0000000000 0000000000 011010000000001110101000001 49d
> > 00 0000000000 0000000000 101010000000001110100111111 49d
> > 10 0000000000 0000000000 010010000000001110101000010 49d
> > 00 0000000000 0000000000 011010000000001110101000001 49d
> > 10 0000000000 0000000000 110010000000001110100111110 49d
> >
> >
> > 0.0005:
> >
> > 00 0000000000 0000000010 001010000000001110100110011 49d
> > 00 0000000000 0000000001 111010000000001110100110101 49d
> > 10 0000000000 0000000010 000010000000001110100110100 49d
> > 00 0000000000 0000000001 111010000000001110100110101 49d
> > 00 0000000000 0000000001 111010000000001110100110101 49d
> >
> > 0.0015:
> >
> > 00 0000000000 0000000100 001010000000001110100100011 49d
> > 10 0000000000 0000000100 010010000000001110100100010 49d
> > 10 0000000000 0000000100 000010000000001110100100100 49d
> > 10 0000000000 0000000011 110010000000001110100100110 49d
> > 10 0000000000 0000000100 000010000000001110100100100 49d
> > 00 0000000000 0000000100 011010000000001110100100001 49d
> >
>
>
>
> 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@...
> Moderator: jmelson@... timg@... [Moderator]
> URL to this page: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
> bill,
> List Manager
>
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>