Ok, based on what everyone has said, I'm imagining the following interface:
* a HAL pin to allow / disallow reverse run
* a HAL pin to command reverse /forward direction (with safe state change
handled by TP)
* adaptive feeds of -1.0 to 0 trigger reverse run at the scaled feed rate
(with safe state change handled by TP)
* motion commands to switch direction (as implemented now)

Am I missing anything?

Rob
On Apr 9, 2015 12:18 PM, "Gene Heskett" <ghesk...@wdtv.com> wrote:

> On Thursday 09 April 2015 12:10:41 andy pugh wrote:
> > On 9 April 2015 at 17:02, Gene Heskett <ghesk...@wdtv.com> wrote:
> > > Following that thought Andy, would there be a way to determine which
> > > direction (as in axis to effect if it wasn't Z) by that method?
> >
> > Back along the programmed path is exactly that.
>
> Okayy.  Now we need that hal pin. ;-)
>
> Thanks Andy.
>
> Cheers, Gene Heskett
> --
> "There are four boxes to be used in defense of liberty:
>  soap, ballot, jury, and ammo. Please use in that order."
> -Ed Howdershelt (Author)
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>
>
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