Does anyone have a signal pinout for the tuner connector? The riocar.org site didn't have signal descriptions (which pin is power, groung, Rx, Tx, Audio, etc.?)

For devices, I have an HD radio development kit that I was going to try to interface. Also, hooking up an iPod/iPhone would be pretty simple (they take RS232 signals to do things like next track, last track, etc., and obviously output audio)... and before someone flames me for wanting to hook an MP3 player up to an MP3 player, keep in mind that the empeg doesn't have Pandora like my iPhone does.

More devices could be CD changers that take serial data, garage door openers (though the practicality would be less than idea).. basically with a serial port, I can interface to almost anything.

I'll start looking at the source, but don't really want to try and scope signals to figure out the pinout for the connector.