On Jan 20, 2015, at 7:43 AM, Maurizio Iacaruso <[email protected]>
wrote:
> I connect USB A (female) to USB B (male) adapter -> HUB -> 2 USB wires male
> to male, one to raspberry and another one to my device.
I'm not sure I understand your setup.
This should work, using standard USB cables:
<- upstream downstream ->
<- host device ->
A->B A->B
Raspberry Pi -> hub -> UPS
|
\---> device
The problem is that there is no equivalent of a "crossover cable" or
"null-model adapter" for USB. (I am ignoring USB OTG for the moment, since you
want the RPi to talk to the UPS). There are many USB adapter cables out there
that will only work for supplying power, or only with point-to-point USB OTG.
--
Charles Lepple
clepple@gmail
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