I'm considering getting the MSC-400 to control my DVD changer. After reading through the programmer's guide, I can't figure out how to get user supplied numbers into an RS-232 command string. I understand the concept of sending the commands to the device, I just can't figure out how to get the number key presses from the remote into the RS-232 command string. Specifically, if I press 137 on the remote, how do I get that into the RS-232 command string to load disc # 137. How do you save the number key presses until all three keys are pressed and then place them into the RS-232 command string?