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System panel connector (20-5 pin PANEL)
This connector supports several chassis-mounted
functions.
•
System power LED (4-pin +PWR_LED-)
This 2-pin connector is for the system power LED.
Connect the chassis power LED cable to this
connector. The system power LED lights up when
you turn on the system power, and blinks when the
system is in sleep mode.
•
Hard disk drive activity LED (2-pin +HDD_LED-)
This 2-pin connector is for the HDD Activity LED.
Connect the HDD Activity LED cable to this
connector. The HDD LED lights up or flashes when
data is read from or written to the HDD.
•
System warning speaker (4-pin SPEAKER)
This 4-pin connector is for the chassis-mounted system warning speaker. The
speaker allows you to hear system beeps and warnings.
•
ATX power button/soft-off button (2-pin PWR_SW)
This connector is for the system power button. Pressing the power button turns
the system on or puts the system in sleep or soft-off mode depending on the
operating system settings. Pressing the power switch for more than four seconds
while the system is ON turns the system OFF.
•
Reset button (2-pin RESET)
This 2-pin connector is for the chassis-mounted reset button for system reboot
without turning off the system power.
Motherboard Pin Definition
PANEL
+PWR_LED-
SPEAKER
PWR_SW
PIN 1
+HDD_LED-
RESET
+PWR_LED-
* Requires an ATX power supply
1-11
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