Asus P2B-L User Manual page 33

III. INSTALLATION
21. Chassis Open Alarm Lead (4-1 pin CHASSIS)
This lead can be used as an open chassis monitor. A high level signal to the
CHASSIS lead will indicate to the system that the chassis has been opened. This
function is available with the hardware monitor installed.
P2B-L/S/LS Chassis Open Alarm Lead
22. Chassis/CPU/Power Supply Fan Connectors (3-pin FAN)
These connectors support cooling fans of 500mA (6W) or less. Orientate the
fans so that the heat sink fins allow airflow to go across the onboard heat sink(s)
instead of the expansion slots. Depending on the fan manufacturer, the wiring
and plug may be different. The red wire should be positive, while the black
should be ground. Connect the fan's plug to the board taking into consideration
the polarity of the this connector.
NOTE: The "Rotation" signal is to be used only with a specially designed fan
with rotation signal.
WARNING! The CPU and/or motherboard will overheat if there is no airflow
across the CPU and onboard heatsinks. Damage may occur to the motherboard
and/or the CPU fan if these pins are incorrectly used. These are not jumpers,
do not place jumper caps over these pins.
P2B-L/S/LS 12Volt Cooling Fan Power
ASUS P2B-L/P2B-S/P2B-LS User's Manual
CHASSIS
+5VSB
CHASSIS
GND
Power Supply Fan Power
CPU Fan Power
Chassis Fan Power
Rotation
+12V
Ground
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