HP EliteBook 2740p - Using the Docking Connector

Audio-in (microphone)
Pin Signal
1 Audio signal in
2 Audio signal in
3 Ground
External monitor
Pin Signal
1 Red analog
2 Green analog
3 Blue analog
4 Not connected
5 Ground
6 Ground analog
7 Ground analog
8 Ground analog
9+5 VDC
10 Ground
11 Monitor detect
12 DDC 2B data
13 Horizontal sync
14 Vertical sync
15 DDC 2B clock
100 Chapter 8 Connector pin assignments ENWW