Re: parallel port finally obsolete?

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Jeffrey T. Birt" <birt_j@...> wrote:

>
> >For using a feedback related application
>
> >(best example is the THC logic in MACH for plasma cutting) it does not
> work.
>
>
>
> Not exactly true. The motion control board needs to handle the 'real time'
> things itself and in fact can do a MUCH better job than Mach (parallel port)
> ever could (due to the limitations of the parallel port model). The
> SmoothStepper, et.al, handle things like limit switches, spindle sync, etc,
> etc internally.
>
>
>
> Jeff Birt
>
> Soigeneris.com
>

You are wrong. You cannot use THC logic in MACH with USB (Smooth Stepper, etc) because it (THC) forms a real time servo loop in MACH with the parallel port. You can't even use the THC function in MACH unless you have the parallel port driver loaded and active. You can't run another driver for pulsing with the parallel port driver.

TOM Caudle
www.Candcnc.com