Panel Connector (20 pin PANEL)The following diagram illustrates items 26-32:

 

 

Speaker

Power LED

Connector

 

Ground Ground Speaker

+5 V

PLED

+5V

+5 V

MLED

ExtSMI# Ground PWR Ground

Reset Ground

P4S533

 

 

Reset SW

MessageLED

 

ATX Power

SMI Lead

 

 

Switch*

* Requires an ATX power supply.

P4S533 System Panel Connectors

26. System Power LED Lead (3-1 pin PLED)

This connector supplies the system power LED. The LED lights up when the system power is on, and the LED blinks when the system is in sleep or soft-off mode.

27. Keyboard Lock Switch Lead (2 pin KEYLOCK)

This 2-pin connector supplies the case-mounted key switch for keyboard locking.

28. System Warning Speaker Lead (4 pin SPEAKER)

This connector supplies the case-mounted speaker to sound system beeps and warnings.

29. System Message LED Lead (2 pin MLED)

This connector supports the system message LED to indicate receipt of messages from a fax/modem. The normal status for this LED is ON, when there is no incoming data signal. The LED blinks when data is received. The system message LED feature requires an ACPI OS and driver support.

30. System Management Interrupt Lead (2 pin SMI)

This connector permits switching to suspend mode, or “Green” mode: system activity is decreased to conserve power and system components. Attach the case-mounted suspend switch this 2-pin connector.

31. ATX Power Switch / Soft-Off Switch Lead (2 pin PWRSW)

The system power is controlled by a momentary switch attached to this connector. Pressing the button switches the system between ON and SLEEP, or ON and SOFT OFF, depending on the BIOS or OS settings. Pressing the button while in the ON mode for more than 4 seconds turns the system off.

32. Reset Switch Lead (2-pin RESET)

This connector supports the case-mounted reset switch for rebooting the system without turning off the power switch.

42

Chapter 2: Hardware information