| bottom of the unit Pin | Pin Name | Description | 
| 1 | ext. power | 3.3v externally regulated. DO NOT FEED WITH 12 VOLTS! | 
| 2 | serial in | RS232 data, connect straight to PC com port | 
| 3 | serial out | RS232 data, connect straight to PC com port | 
| 4 | ground | signal ground | 
| 5 | headphone select | ground this pin to disable internal beeper and send audio out connector instead | 
| 6 | left audio | for the firmwares mp3/ogg player, of course | 
| 7 | right audio | and the waypoint voicenote feature, too | 
The PC-DI7 cable uses four pins, but doesnt bring out the audio connections for simultaneous use as an audio player.


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