[clug] Dumb USB question
bradh at frogmouth.net
Tue Aug 8 07:34:14 GMT 2006
On Tuesday 08 August 2006 13:14, steve jenkin wrote:
> The Dumb User method is to use a USB F-F joiner to join the M-M
> USB output cable from U-KVM to the USB-PS/2 adaptor. Alternate
> would be to plug both devices into powered hub (no host).
> It's gonna do one of three things:
> - work :-)
> - not work :-(
> - fry everything is sight (or on site) :=[
Possible, but unlikely. Design normally accounts for this. More likely if
things are earthed though.
USB isn't a peer-to-peer arrangement. It has host and device. Hosts provide
power (always at least some, since this is how the device detection works)
using two of the four wires/pins. The other two are D+ and D- (differentially
signalled, more like RS422, except that the same wires are used for comms in
both directions). Hosts tell devices what they want, and devices answer.
[You might have heard of "interrupt transfers" - USB interrupt means "host
polls device at specified interval"]
Some hardware can be either a host or a device (aka "USB on the Go"), but not
at the same time.
Different conversion boxes work differently, so I don't have a clear answer -
I'd try avoiding the PS/2 part, and just put a USB card in the linux box if
it doesn't already have such a port.
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