Re: digital servo controller to offload the Parallel Port?

[Jon Elson <elson-at-pico-systems.com>]

John Griessen wrote:

>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?
>
Why do you want to add more computers?  It only adds to the confusion 
factor.

>  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.  
>
>  
>
See my page http://pico-systems.com/PPMC.html for 2 products that do 
this.  The PPMC
is a board SET, using FPGAs and CPLDs, to implement an analog-output 10 
V signal
for analog-input servo amps.  The Universal Stepper Controller is a 
single board that
implements a step pulse rate generator and encoder counter, which 
essentially makes
any step-dir drive into a servo system.  These products are already 
designed and tested.
They each do 4 axes, but can be expanded to 8, 12 etc.

Jon