3. HARDWARE SETUP

The following diagram is for items 21–27:

P4T-EM

P4T-EM System Panel Connectors

Keyboard Lock

Speaker

Power LED

Connector

 

Ground Ground Speaker

+5 V

PLED Keylock Ground

+5V

+5 V

MLED ExtSMI# Ground PWR Ground

Reset Ground

MessageLED

 

Reset SW

ATX Power

SMI Lead

 

 

Switch*

*Requires an ATX power supply.

.3

H/WConnectors

SETUP

21)System Power LED Lead (3-1 pin PLED)

This 3-1 pin connector connects the system power LED, which lights when the system is powered on and blinks when it is in sleep mode.

22)Keyboard Lock Switch Lead (2-pin KEYLOCK)

This 2-pin connector connects to the case-mounted key switch to allow key- board locking.

23)System Warning Speaker Connector (4-pin SPEAKER)

This 4-pin connector connects to the case-mounted speaker. Two sources (LINE_OUT and SPEAKER) will allow you to hear system beeps and warn- ings. Only SPEAKER will allow you to hear system beeps before the integrated audio has been properly initialized.

24)System Message LED Lead (2-pin MLED)

This indicates whether a message has been received from a fax/modem. The LED will remain lit when there is no signal and blink when there is data re- ceived. This function requires an ACPI OS and driver support.

25)System Management Interrupt Lead (2-pin SMI)

This allows the user to manually place the system into a suspend mode or “Green” mode, where system activity is decreased to save electricity and expand the life of certain components when the system is not in use. This 2-pin connector con- nects to the case-mounted suspend switch.

26)ATX Power Switch Lead (2-pin PWRBTN)

The system power is controlled by a momentary switch connected to this lead. Pressing the button once will switch the system between ON and SOFT OFF. Pushing the switch while in the ON mode for more than 4 seconds will turn the system off. The system power LED shows the status of the system’s power.

27)Reset Switch Lead (2-pin RESET)

This 2-pin connector connects to the case-mounted reset switch for rebooting your computer without having to turn off your power switch. This is a preferred method of rebooting to prolong the life of the system’s power supply.

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ASUS P4T-EM User’s Manual