[time-nuts] RS 232
Hal Murray
hmurray at megapathdsl.net
Thu Jul 25 20:18:49 UTC 2013
EWKehren at aol.com said:
> David had the right answer using the power that the RS 232 mouse uses out
> of a DB 9, started looking but I do not have one any more and I can not
> find any data.
Some PCI cards have a jumper on one of the modem control signals to provide 5
or 12 V. It was used to power things like bar code scanners before USB came
along. (I'll dig out a part number if anybody wants it.)
If you only need a few mA, you can get that from the normal modem control
signals. I have a temperature sensor that works that way.
--
These are my opinions. I hate spam.
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