On Wed, 28 Sep 2005 08:50:05 -0300, Gerhard Fiedler wrote:

> PicDude wrote:
> 
> > Why not just timeout like an auto-shutoff?  You can monitor the
> > busy/ready light or a power line to the print-head, etc.
> 
> Good idea! The busy light is probably better, because you can monitor it
> without modifying the printer (and losing warranty). But this still
> wouldn't turn it on...

Well turning it on needs the "magic packet" which others have referred to, which will cause the network card 
to set the WOL signal.  After that, you're on your own!  :-)  You need to power the network card using the 
"standby" power (5V and/or 3V3) at all times, so that it can receive and respond to the magic packet.

Remember it's designed to operate in a PC, so the machine wakes from its suspended state and the software 
takes over, doing whatever it was supposed to.  The shutdown is caused by a period of inactivity according to 
whatever parameters are set, which may have nothing to do with networking, and can be instigated by the BIOS, 
the operating system, or both.  That's why the network card takes no part in the going to sleep, only the 
waking up - it's not its job to decide, because all sorts of things could be happening that it knows nothing 
about - so a higher power which does know, makes that decision.

Cheers,


Howard Winter
St.Albans, England


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