[mythtv-users] Homebrew Serial Receiver Problems

David Brodbeck gull at gull.us
Tue Feb 27 01:23:55 UTC 2007

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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