Re: [CAD_CAM_EDM_DRO] A crazy idea

Mariss;

This seems like a great idea, but I'm confused about the first bit. It
appears that you would be using three separate states - on, off and
floating. How else would the driver know the difference between the first
zero and no bit at all?

Please explain a little more for those of us who are digitally impaired.

Doug

----- Original Message -----
From: mariss92705 <mariss92705@...>

> Parallel port output CNC programs are limited to 3 or 4 axies because
> of the limited number of port bits. Each axis requires a STEP and
> DIRECTION bit pair. What if it could be done with a single bit per
> axis where STEP and DIRECTION were combined on the same line? It then
> would be possible to run 6 to 8 axies.
>
> Here's how it could be done:
>
> (1) 100000000010000000001000... is CW
> (2) 011111111101111111110111... is CCW
>
> In (1), a narrow positive going pulse would be interpreted as a CW
> motion. In (2), a narrow negative going pulse would result in CCW
> motion at the same speed. One would simply invert (1) to generate (2).