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.

Have a look at the Xantech website. For example combine the SMVID01 with the CSM1

http://www.xantech.com/controls/ControllersSwitches/ControllersSwitchers/SMVID01/

http://www.smarthome.com/81821/Xantech-Current-Sensor-Connecting-Block-CSM1/p.aspx




G68J, HD621, ...