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ASUS P5A User’s Manual 29
III. INSTALLATION
Connectors
III. INSTALLATION
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 requires an external detection mechanism such as a chassis intrusion moni-
tor/sensor or microswitch. The sensor is triggered when a high level signal is
sent to the CHASIS lead. This occurs when the side panel is opened or drive bay
doors are opened.
NOTE: When the chassis is opened, connect/short the Chassis Signal pin to the
+5VSB pin. When the chassis is opened, connect/short the Chassis Signal pin to
the Ground pin.
P5A Chassis Open Alarm Lead
R
+5Volt (Power Supply Stand By)
Ground
Chassis Signal