Re: [CAD_CAM_EDM_DRO] Re: LPT1

I have been looking into the same thing. It looks like doing anything CNC
over USB is pretty iffy. USB uses a packet based transport mechanism that
can interfere with signal timing. There are supposed to be some
workarounds, but according to Greg Kroah-Hartman (the guy who wrote the
linux usb patch), they are not real pretty or efficient. I have thought
about a PCMCIA to serial or parallel adapter, but I have not looked into
how timing works on it. I think that you might be better off using a PC
with a true parallel or serial port.

Mike

Certified heathen and reformed pacifist

http://www.p1800s.com

On Mon, 8 Aug 2005, Keith Bucklitch wrote:

> I am interested in the comment that sufficient voltage is available from a
> USB port. I was looking to purchase a new laptop the other day to drive my
> CNC interface, and was surprised to find that this particular make (Acer)
> did not have a parallel port as standard. The salesman tried to sell me a
> USB to Parallel converter, but as I was unsure that such a device would put
> out sufficient volts, I declined the sale.
>
> Can you confirm that the voltage from one of these USB-parallel converters
> will put out sufficient volts?
>
> Keith
>
>
>
> At 05:19 08/08/2005, you wrote:
>
> >In a message dated 8/7/2005 7:31:48 P.M. Central Daylight Time,
> >dave_mucha@... writes:
> >
> >You can get 5v from the PC if the PC has 5V, but if you have less, that may
> >be a problem.<<
> >On newer PC's, you can steal 5VDC from a USB port. If you don't have those,
> >there is almost-surely an unused "disk-drive power-plug" inside (the white
> >things with the red, yellow, and two black wires). The Red wire should be 5
> >VDC. The blacks are Gnd. (-ve). The yeller is 12 VDC.
> >
> >
> >
> >
> >
> >
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