There are sensors available which detect if a component is on/off by means of an audio of video ouput. In this case you can use the 568's composite output.
I may be wrong here but you need to be careful with this, I think the 568 just overlays text to a composite video signal passing through it, rather than creating the composite signal, so test this out before investing. Wire it up to a TV and check that a picture appears when the 568 is on, and disappears when its off. I think you'll find that you never get a picture unless you put one into the 568 in the first place.
Rick
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