I have a Home Theater Master MX-500 remote that I am trying to program to operate a DirecTV H20 HD receiver. There doesn't seem to be a 3 digit code for the H20/RC24, nor do they send out commands when you try the learn function on the MX-500. I have the H20 set to IR mode, and I currently have the MX-500 operating a Plasma TV, dvd, receiver, and a vcr. Is the only option to get a different DirecTV receiver? I know my old Hughes HTL-HD receiver allowed me to use the MX-500 to control it.