P4X MAINBOARD SERIES
Page 20
The following System Panel Buttons and
LED Connectors can be found at the front of
the mainboard on the left hand side.
PW = Power On/Off and
Suspend Switch Connector
S5L = Standby LED Connector
HL = HDD LED Connector
RS = Reset Button Connector
2.5.9. SMB (System Management Bus) Connector (optional)
Connector: CN 42
Type: 4 pin
The SMB is a 2-wire specification which allows for communications between an
external UPS or other power devices and a computer. Each of these mainboards
has a SMB connector onboard, which can be connected to other SMB devices .
2.6.1 PW: Power On/Off and External Suspend Switch Connector
The Power On/Off connector has two functions. It can be the Power Switch or
Suspend Switch of your PC system. You can either choose “Delay 4 Sec or In-
stant OFF” (Please refer to the Award BIOS setup instructions in Chapter 3).
Option 1: If you choose “Delay 4 Sec.” In the BIOS CMOS Setup, the function
of “PW” will be:
A. When the system power is "OFF", press this switch, the system
will power on.
B. When system power is "ON”, you can select two different modes: -
Mode 1: Press and hold the Power ON button for less than 4 seconds and then
release it. The system will be turned into Suspend mode (turned into the GREEN
mode) When the system is in the Suspend mode:-
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Press the Power on button (less than 4 seconds), the system will return
to Full ON mode.
2.6. System Panel Buttons and LED Connectors
PIN 1
S5L:
HL:
+5V DC Pull Up Ground
RS:
Reset Control
PW:
+5V DC Pull Up
Ground
Ground
Top View of the System
Panel and LED Connectors
Clock
Ground
Data
+ 5V
1 Clock
2 No Connection
3 Ground
4 Data
5 +5V DC
Top View of an SMB Connector
Front View of an SMB Connector
Hardware Installation
