Here you go Dan.
Also the Service manual is on it's way to your email.
DSUB 25-PIN ACCESSORY CONNECTOR
Pin 1: RSSI [Analog Output]
Pin 2, 3, 4, 5 & 6: SELECT, DSUB 03, DSUB 04, DSUB 05 & DSUB 06 [Digital Input Port]
Pin 7: E [GND]
Pin 8: A KEY OUT [Universal Output Port]
Pin 9: TXD [Digital Output for Alignment software]
Pin 10: RXD [Digital Input for Alignment software]
Pin 11: EXT PTT
Pin 12: MIC MUTE
Pin 13: TXDI [Digital Input for DATA Communications]
Pin 14: DC OUT [13.4 V/5 V DC Output]
Pin 15: IGN [Ignition Sense feature]
Pin 16: NC [NO connection]
Pin 17: RX DO [Digital Output for DATA Communications]
Pin 18: E [GND]
Pins 19, 20, 21, & 22: DSUB 19, DSUB 20, DSUB 21 and DSUB 22
Pin 23: EXT SQL [Squelch Signal Output]
Pin 24: SP MUTE [Speaker Mute Output]
Pin 25: E [GND]
If you need more let me know.
John