On 2009-01-12, Unruh <[email protected]> wrote:

> In general serial ports do NOT supply power. The RS232 standard does not
> state that any power should be supplied. Now, some may create serial ports
> which do, but those are out of standard and will depend on whose serial
> port you have. Ie, if you want to be sure, use the usb port for power. The
> standard says they have to supply power (5V) 

You're assuming that all computers / SBCs / Embedded Systems have a USB
port.

-- 
Steve Kostecke <[email protected]>
NTP Public Services Project - http://support.ntp.org/

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