I have not been able to get data from 2000 Diplomat Cummings ISC until today. Art Renda was his usual cheerful and happy self. After running several checks of my system Art discovered I was plugged into Allison Data Port not the Cummings Data Port. I had been looking for engine port for weeks. Finally found that someone had moved from under dash to inside the left side console. Moved connect to proper plug and jib and we are working. Thanks, Art