I've searched and couldn't find a file with discrete codes to control power on and power off functions for the DirecTV HR20-700 (HD DVR). I determined that the discrete codes for power on DirecTV's remote only function if you have the remote programmed to control another component. I programmed a different component (hopefully this doesn't power on/off another component of yours because I chose a code one digit different from Mitsubishi TV's). I tested and it works with my DVR. The discrete power off will not turn on the unit, nor will the discrete power on turn off the unit.