Impaqt,
I think he is talking about this
http://www.maxxproducts.com/.
We have used them in small restaraunts and once or twice in homes. The product is okay, pic quality is average. Controlling the plasmas sux. There are supposedly discrete codes available for input selection but I havent been able to get anyone to send these to me. The serial protocol is clean and simple, if you get the right version and IF the plasma responds to the commands. So far I havent had any luck getting more than one or two commands to do anything to the plasma. Personally I am not a big fan of the product. If you are just using them for a TV, great unit. Past that, well I think there are better options out there.
Just my $.06