Pin Definition

1-12
Motherboard Pin Denition
• 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ashes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.
• Chassisintrusionheader(2-pinCHASSIS)
This connector is for a chassis-mounted intrusion detection sensor or switch.
Connect one end of the chassis intrusion sensor or switch cable to this
connector. The chassis intrusion sensor or switch sends a high-level signal to
this connector when a chassis component is removed or replaced. The signal is
then generated as a chassis intrusion event.
System panel connector (20-3 pin F_PANEL)
This connector supports several chassis-mounted
functions.
PLED+ PLED- PWR GND +5V GND GND Speaker Intruder#
HDD_LED+
HDD_LED-
GND
Reset
NC
PLED+
PLED-
GND
PIN 1
+PWR_LED-
+PWR_LED-
SPEAKER
PANEL
+HDD_LED-
PWR_SW
RESET
* Requires an ATX power supply
CHASSIS