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

I am really busy at work these days. (The caliper project was a work
project.) It will be a month or so until I can even think about publishing
it.

I finished up the software that reads and uses the caliper data. I am very
happy with the project. I can't wait to start writing the DRO software.


I had the following questions put to me:

> Regarding #4 above, I don't know how you get '3 calipers need 6 bits',
> (are they quadrature?) but you may find it of interest to know my pal
> DaveK (of TurboCNC fame at

Each caliper puts out a clock signal and a data signal. Both signals need
to be input into the computer for each caliper. 3 calipers x 2 signals = 6
inputs.

> http://www.dakeng.com/turbo.htm
>
> does not configure the parallel port to 12 bits out and 5 bits in.
>
> He configures it as 8 bits out and 8 bits in. That would give you
> 8 bits in (for perhaps 4 calipers)?

Yes, but... on the old PS2 parallel ports, the data port could be
configured for EITHER input or output. On the new PCs, the data port is
output only. One has to use the status port pins for inputs. The Bi
directional parallel port was an oddity that is no longer produced, as far
as I can tell. Maybe
certain parallel port cards have bi directional ports on them.


Someguy

----- Original Message -----
From: <wayne_j_hill@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Friday, October 19, 2001 11:00 PM
Subject: [CAD_CAM_EDM_DRO] Re: Caliper to PC interface, Part II: Data Format
?????? Help ?


> I'm interested in the interface when you are ready to post it.
>
> Wayne
>
>
> > Hi people.
> >
> > I've successfully *connected* my imported caliper directly to a
> PC. I did not use a microcontroller in between. The interface is
> NOT RS232. I will detail this whole project in a future posting for
> those that are interested. ....................
>
> <snip - >
>
>
>
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