how to turn off epson scanner

I notice that when i shut down my linux machine (Linux
localhost.localdomain 2.6.17-1.2187_FC5 #1 SMP Mon Sep 11
01:16:59 EDT 2006 x86_64 x86_64 x86_64 GNU/Linux)
(running Fedora Core 5), my epson 2400 scanner gets turned
off.

Therefore it would seem that some command gets sent to the
scanner by my system that turns it off.  (There is no power
switch on this scanner, so if one wants to turn it off
manually
one has to unplug it.)

Does anyone know what command turns this scanner off?

Any info much appreciated.  I would like to be able to turn
my
scanner on and off from the keyboard if possible.

    -- Peter

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