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saolesen(at)sirentel.net
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 Posted: Tue Nov 19, 2013 8:55 am Post subject: USB pinouts |
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I looked up the pinouts for a USB port on Wikipedia and ended up confused. They label pin 2 & 3 as data - and data + respectively. I need to know which is data transmit and data receive. Any help would be appreciated.
I also don't like the 24ga wires included with the plug. Are there any USB plugs that I can add on my own wires or have 22ga wires?
Thanks,
Sheldon Olesen
Sent from my iPad
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nuckolls.bob(at)aeroelect
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| Posted: Tue Nov 19, 2013 9:46 am Post subject: USB pinouts |
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At 10:55 AM 11/19/2013, you wrote:
| Quote: |
<saolesen(at)sirentel.net>
I looked up the pinouts for a USB port on Wikipedia and ended up
confused. They label pin 2 & 3 as data - and data +
respectively. I need to know which is data transmit and data
receive. Any help would be appreciated.
|
The USB serial communications is 'party-line'
communications on a twisted pair. The host
controller (usually in your computer) queries
the data bus to see who's out there and which
of several modes of communications are being
requested. Only one device can talk while all
devices can listen. Hence, unlike RS232, there
are no separate tx, rx lines.
| Quote: | I also don't like the 24ga wires included with the plug. Are there
any USB plugs that I can add on my own wires or have 22ga wires?
|
Digikey sells all manner of serial data cable
connectors. An exemplar A plug that would accept
22awg wire is here
http://tinyurl.com/plg4goq
They sell for about $3.50
When I need a USB cable that will carry power
out to an accessory, I usually order a 'high
current' pre-fab cable and cut one end off.
You end up with a more compact, factory
installed connector on the far end.
Bob . . .
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deej(at)deej.net
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saolesen(at)sirentel.net
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| Posted: Tue Nov 19, 2013 11:52 am Post subject: USB pinouts |
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Bob and DJ, thanks! Your suggestions are helpful and will be used.
Thanks again,
Sheldon Olesen
Sent from my iPad
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