Looking for the CAI 302 gurus out there...

I have a new to me CAI 302 that has several pilot names programed in it. I want to delete all of the old pilots from the device. I found the 302 dataport specification document, which says that I should be able to issue a "CLEAR PILOT" command from a terminal emulator like Windows HyperTerminal. However, that command returns a "What?" message from the 302. The "CLEAR LOGS", "CLEAR POINTS", "VERSION", Etc. all work as expected so I know things are generally working fine.

Any idea what may be going on and how to get rid of all the extra pilots?

Robert