How do I programmatically send signals to USB?

Hello

How do I control voltages to pins of the USB programmatically?
For example, I'd like to say send a signal to individual USB pins (if
that's applicable in USB) how do I do that ?

Also what's the appropriate newsgroup for this question?  Thanks .

unisonharmonics@gmail.com wrote:
> How do I control voltages to pins of the USB programmatically?

You don't.

On 30 Apr 2007 12:08:52 -0700, unisonharmonics@gmail.com wrote:

>Hello
>
>How do I control voltages to pins of the USB programmatically?
>For example, I'd like to say send a signal to individual USB pins (if
>that's applicable in USB) how do I do that ?
>
Here's a nice USB to serial device, ~ $30 from Mouser Electronics:
http://www.vinculum.com/prd_vdrive1.html
Called a VDrive by Vinculum or FDTI. I have a couple. They interface
to ucontrollers nicely. Could also be used on a serial port of a PC
(but why if your PC has a USB port?) But they work VERY nicely with
uControllers.
>Also what's the appropriate newsgroup for this question?  Thanks .

On Apr 30, 3:08 pm, unisonharmon...@gmail.com wrote:
> Hello
>
> How do I control voltages to pins of the USB programmatically?
> For example, I'd like to say send a signal to individual USB pins (if
> that's applicable in USB) how do I do that ?
>
> Also what's the appropriate newsgroup for this question?  Thanks .


Individual pins of what USB? A PC USB port? An embedded system? What
microcontroller?

<unisonharmonics@gmail.com> wrote in message 
news:1177960132.854013.293520@h2g2000hsg.googlegroups.com...
> Hello
>
> How do I control voltages to pins of the USB programmatically?
> For example, I'd like to say send a signal to individual USB pins (if
> that's applicable in USB) how do I do that ?
>
> Also what's the appropriate newsgroup for this question?  Thanks .

You almost certainly can't using a standard USB port. However, if you 
are driving a USB connector from a microcontroller or something then you 
can control the pins however you like. It won't talk USB though.