RE: [CAD_CAM_EDM_DRO] Re: Interface. Gauging interest.

JMO
You just need to get away from using a parallel port period. I find it repugnant
that this practice is still being using in the 21st century.

-----Original Message-----
From: CAD_CAM_EDM_DRO@yahoogroups.com [mailto: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 would
bear no resemblence to the sent original.

Mariss











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