Re: LPT1

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "c_holm10017" <cholm@m...> wrote:

> Keith,
>
> I have no idea whether a USB to LPT converter will provide the
> required voltage, but you should also consider the software you are
> planning to use. For example, TurboCNC ONLY runs under pure DOS and
> unless you have DOS drivers with the USB to LPT connector that will
> allow you to output to the standard LPT addresses, I bet you will be
> out of luck. If your software is Windows based as I understand some
> are (Maybe Mach??), this may not be a concern.
>
> Chris

The USB spec details that the voltage should be beteen 4.4 and 5.25 volts.

it further details a 'unit load' of 100mA with a maximum of 5 unit
loads on a port.


Here is a link to a gerneral overview of USB.

http://www.beyondlogic.org/usbnutshell/usb2.htm

Dave

>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, Keith Bucklitch
> <keith.bucklitch@w...> 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@y... 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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