Still a little confused. For the Sony 777 I believe the serial commands to load a disk are "Folder", followed by the numbers for the slot, and then "Enter". Each command is carriage returned. You didn't say what Sony changer you had. Are you sure the only way to load a disk via RS-232 is with one serial string which contains disk load and the slot number?

If I still don't understand the problem, sorry.

Edit: Saw you on AVS......so you have the new 7000. Way cool.