Pioneer Elite codes listed in the MSC400 files have double slashes, they should be single. Also, the red and white wires of the MSC 400 RS232 cable have to crossed (splice red to white and white to red) to get the Plasma to respond. Spent about 12 hours over a three week period trying to get control and finally did it today. The MSC400 RS232 cable is straight through (pin 2 to 2 and 3 to 3).
It should be 2on one end th 3 on the other.