Here's a sample CCP file showing what I'm saying. Use the default serial settings for the MSC400 when setting up Hyperterminal.

UP - Normal Macro that sends a smart macro trigger to send TEST out of serial port 12 of the MSC-400. When you press Up 10 times, you should see at least 2/10 commands that are lost using Hyperterminal.

DOWN - Uses a toggle method (variable macro) to switch smart macro triggers on each button press. This ensures no single smart macro trigger is sent twice in a row, but results in the same ascii text being sent each time on port 12. When you press DOWN 10 times, RS232 dropped commands diminish and the button actually works.

LEFT and RIGHT illustrate the repeat issue. RIGHT uses the press/hold work around. It seems at random, one extra RS232 command is sent after the RIGHT button is released. The LEFT button almost always sends two commands on a single press.

Use the google document link below to download this test file...
docs.google.com/leaf