I am considering adding in a MSC-400 controller into my home theater/remote setup.

My primary interest in the RS-232 control and the power sensing abilities of the MSC-400. However, I am looking for a bit more information on how exactly the pwoer sensors function. One of the devices I would like to use the power sensors for is a pair of media centers. Currently, I only have these devices "powering down" into standy rather than "shutting down". Do the power sensors have a way to sense a draw over/under a certain value or simply whether their is a current draw or not?

Any information and/or links to some documentation specifically on the power sensors would be greatly appreciated.