PM845G Series Mainboard
16
Front Panel Indicators: SW/LED
Pin
Assignment
Function
Pin
Assignment
Function
1
HD LED (+)
2
ACPI LED (+)
3
HD LED (-)
Hard Drive
LED
4
ACPI LED (-)
POWER LED
5
Reset SW (-)
6
Power SW(+)
7
Reset SW (+)
Reset Switch
8
Power SW(-)
Power-on
Switch
9
NA NA
10
NC NC
HD LED (Hard Drive LED Connector)
This connector can be attached to an LED on the front panel of a computer case. The
LED will flicker during disk activity. This disk activity only applies to those IDE drives
directly attached to the system board.
RST SW (Reset Switch)
This connector can be attached to a momentary SPST switch. This switch is usually
open and when closed will cause the mainboard to reset and run the POST (Power On
Self Test).
ACPI LED (Power LED Connector)
This connector can be attached to an LED on the front panel of a computer case. The
LED will illuminate while the computer is powered on.
PWR SW (Power Switch)
This connector can be attached to a front panel power switch. The switch must pull the
Power Button pin to ground for at least 50 ms to signal the power supply to switch on or
off. (the time required is due to internal debounce circuitry on the system board). At least
two seconds must pass before the power supply will recognize another on/off signal.
SPEAKER (Speaker Connector):
PIN
Assignment
PIN
Assignment
1
PC_BEEP
3
GND
2
NC
4
+5V
An off-board speaker can be installed on the mainboard as a manufacturing option. An
off-board speaker can be connected to the mainboard at the front panel connector. The
speaker (onboard or off-board) provides error beep code information during the Power
On Self-Test when the computer cannot use the video interface. The speaker is not
connected to the audio subsystem and does not receive output from the audio subsystem.