Pinouts and Signal Descriptions
13
3.7. System Management Header (COM 2)
There is a DB9 port with proprietary pinout on the right side panel for system management (labeled “COM 2”).
Figure 10: System Management Header
Pin
Signal
Pin
Signal
1 HDLED+ 6
PWRBTN#
2 PLED+ 7
RESET#
3 HOLED- 8 GND
4 PLED- 9 N/C
5 GND
Table 9: System Management Header Pin definition
PWRBTN: Power Switch
•
Short pins 5 and 6 to do the following: (1) if the system is off, the system will be power on; (2) if the operating
system is running, then a window will pop up asking if the user wishes to turn off the system.
RESET: Reset Switch
•
Short pins 7 and 8 to trigger a hard reset.
PLED: System Power LED
•
On: system is operating
•
Blinking: system is in S1/S3 sleep state
•
Off: system is in S4 sleep state or powered off (S5).
HDLED: Drive Activity LED
•
The LED is on when the hard drive is reading or writing data.
