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ASUS P5A User’s Manual 29
III. INSTALLATION
Connectors
III. INST ALLATION
11. ATX Power Supply Connector (ATX, 20-pin block)
This connector connects to a ATX power supply. The plug from the power supply
will only insert in one orientation because of the different hole sizes. Find the
proper orientation and push down firmly making sure that the pins are aligned.
IMPORTANT: Make sure that your ATX power supply can supply at least
10mAmp on the 5-volt standby lead (+5VSB). You may experience difficulty in
powering on your system if your power supply cannot support the load. For
Wake on LAN support, your ATX power supply must supply at least 720mAmp.
P5A ATX Power Connector
+3.3 Volts
-12.0 Volts
Ground
Power Supply On
Ground
Ground
Ground
-5.0 Volts
+5.0 Volts
+5.0 Volts
Power Good
+12.0 Volts
+3.3 Volts
+3.3 Volts
Ground
+5.0 Volts
Ground
+5.0 Volts
Ground
+5.0 Volts Standby
R
12. Chassis Intrusion Alarm Lead (4-1 pin CHASIS)
This lead is for a chassis intrusion monitor or sensor. The sensor is triggered
when a high level signal is sent to the chassis signal lead. This occurs when a
panel switch or light detector is triggered. This function requires the optional
ASUS CIDB Chassis Sensor to be installed (see VI. ASUS CIDB)
NOTE: When the chassis is opened, connect/short the Chassis Signal pin to the
+5VSB pin. When the chassis is closed, connect/short the Chassis Signal pin to
the Ground pin.
P5A Chassis Open Alarm Lead
R
+5Volt (Power Supply Stand By)
Ground
Chassis Signal