Re: digital servo controller to offload the Parallel Port?

["Les Watts" <leswatts-at-alltel.net>]

Hi, John

The whole idea with EMC is really host signal processing.... the
computer cpu does all the servo loop calcs in a real time
operating system. Even a very slow old commodity computer has
enough processing power to do a high performance job. So it does
not need outboard processors.

That being said- there is still the requirement of some kind of adapter
to interface mixed analog/digital signals to the computer. That
is the real expense. Current systems cost a lot due to
the low volume.

Les
Leslie Watts
L M Watts Furniture
Tiger, Georgia USA
http://www.alltel.net/~leswatts/wattsfurniturewp.html
engineering page:
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----- Original Message -----
From: "John Griessen" <john_g-at-cibolo.com>
To: "Multiple recipients of list" <emc-at-nist.gov>
Sent: Wednesday, December 18, 2002 10:36 AM
Subject: digital servo controller to offload the Parallel Port?


>
> Hello y'all,
>
> If a feedback loop is too much for emc on a PC via standard ports, has
> anyone made a microcontroller digital servo loop controller for emc
> yet?  Who wants one?  How many?  I can design such and nowadays it can
> even be lower cost then microcontrollers/memory when you design it into
> a FPGA system chip.
>
> John Griessen
> Austin TX
>
> On Wed, 2002-12-18 at 01:22, Till Franitza wrote:
> to detect encoder Feedback directly via parallel port whould put a too
> > heavy load on the processor. I do not think it would even work with
> > reasonable resolution.
> > Till
> >
> > > -----Ursprüngliche Nachricht-----
> > > Von: emc-at-nist.gov [emc-at-nist.gov]Im Auftrag von Adam Hunt
> > > Also, could one use the parallel port for quadrature encoder feedback
IO?
> > >
> > > --adam
>
>
>
>
>
>