P C / 1 0 4 C P U M o d u l e P F M - 5 4 0 I R e v . BChapter 2 Quick Installation Guide 2 - 1222 N.C2.11 PS2 Keyboard/Mouse Connector (CN2)Pin Signal Pin Signal1 KB_DATA 2 KB_CLK3 GND 4 +5V5 MS_DATA 6 MS_CLK2.12 Optional Power Connector (CN3)Pin Signal1 -12V2 -5V3 GND2.13 USB (3-4) Connector (CN4)Pin Signal Pin Signal1 +5V 2 GND3 USBD3- 4 GND5 USBD3+ 6 USBD4+7 GND 8 USBD4-9 GND 10 +5V