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2015 Jan 20
0
R: NUT and relay on USB
On Jan 20, 2015, at 7:43 AM, Maurizio Iacaruso <maurizio.iacaruso at gmail.com> 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
2015 Jan 20
2
R: NUT and relay on USB
So, just as recap:
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.
Thanks a lot.
I hope that it works fine :)
Maurizio
-----Messaggio originale-----
Da: Charles Lepple [mailto:clepple at gmail.com]
Inviato: marted? 20 gennaio 2015 13:38
A: Maurizio
Cc: NUT List
Oggetto: Re: [Nut-upsuser] NUT and relay
2015 Jan 20
3
R: R: NUT and relay on USB
...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
<http://en.wikipedia.org/wiki/USB_On-The-Go> 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 at gmail
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