Re: Interface. Gauging interest.

>
> JMO
> You just need to get away from using a parallel port period. I find

> that this practice is still being using in the 21st century.
>
> -----Original Message-----
> From: CAD_CAM_EDM_DRO@yahoogroups.com

> On Behalf Of Mariss Freimanis
> Sent: Monday, May 15, 2006 12:30 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: [CAD_CAM_EDM_DRO] Re: Interface. Gauging interest.
>
> > ballendo wrote:
> >
> > What we truly need is a usb EQUIVALENT of the parallel port.
>
> That's just not possible for CNC programs that output step and
> direction signals from a parallel port. Step pulses have timing in
> the microsecond range. Example:
>
> 20kHz step pulse freq = 50uS period
> 19.9kHz step pulse freq = 50.25uS period
>
> The difference is only a 1/4 microsecond. USB serializes data which
> strips this timing information; the reconstituted parallel data

> bear no resemblence to the sent original.
>
> Mariss
>
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