The Xantech Gatekeeper will temporarily shut the gate to the toggle power command in your "on" macro string if the TV is already on. Will do the same with the "off" macro string if the TV is already offf. The sensing can be from the video monitor output or from the current sensing inline AC outlet module. You will have to program some Xantech pre-cursor codes in the strings so it knows what your intent is (on or off). Very neat system that doesn't get enough credit/exposure for what it does.