[mythtv-users] Homebrew Serial Receiver Problems
John
jharitos at yahoo.com
Tue Feb 27 03:41:52 UTC 2007
This is probably why you won't see a standard voltage
output with a multi-meter where as on a USB port you
can pull a reading off of the pwr and grnd.
Jeremy Gillick wrote:
> If the serial port does not provide power, then why
do the circuit
> diagrams have a voltage regulator?
>
There's no officially-designated power pin on the
serial port. It's not
uncommon for non-standard serial port devices to use
some of the pins
for small amounts of power, though. The driver for the
device simply
makes sure those pins are set high.
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