On 03/09/2011 09:50 AM, Wild_Bill wrote:
Maybe not what the OP is interested in, but here's a program that is
stated to work with (I haven't tried it) old computer parallel printer
ports.. 486 PC 100Mhz.

Quadrature 5V signals from linear or rotary encoders.

http://www.lindsayengraving.com/othe...rests/dro.html

It'll be DOS only, from the description and the look of the screen
shots. Windows or Linux machines would need a special driver. And
you'd have issues with making sure that the program looks at the port
often enough -- if it misses a count, then it'll be off until the next
time you home the axis.

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

Do you need to implement control loops in software?
"Applied Control Theory for Embedded Systems" was written for you.
See details at http://www.wescottdesign.com/actfes/actfes.html