Re: stepper pulse rate idea

[Paul <paul-at-bdiemc.fslife.co.uk>]

Hi John

With freqmod it is already possible to output a quadrature signal by setting 
STEPPING_TYPE to 2. A number of other binning algorithms are in place for 
various types of output. These are :

Type 0 - The standard step/dir freqmod output.
Type 1 - A two phase grey code output for interfacing directly to Bridgeport 
stepper drives.
Type 2 - A quadrature output for The Motion Group drives
Type 3 - A four phase output for Taig and Microproto packages.
Type 4 - An implimentation of the original steppermod algorithim.

The advantage of freqmod over steppermod is it can handle encoder feedback by 
using it's derivative, smdromod.

Regards, Paul.


On Friday 14 March 2003 2:55 pm, jmkasunich-at-ra.rockwell.com wrote:

> 2)  Instead of outputing step and direction, use the same
> two pins to output a quadrature signal  (like an encoder
> signal).  Then use an external decoder circuit to generate
> step and direction signals from the quadrature signals,
> stepping on each quadrature transition.

-- 

"To err is human...to really f*** things up requires the root password."
>From a collection of quotes at http://www.indigo.org/quotes.html