Front Panel Switches & Indicators Header - Abit SG-72 User Manual

2-8
(5). Front Panel Switches & Indicators Header
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HDDLED: Hard Drive Activity LED
Connecting pins 1 and 3 to a front panel mounted LED provides visual indication that data is being
read from or written to the hard drive. For the LED to function properly, an IDE drive should be
connected to the onboard IDE interface. The LED will also show activity for devices connected to
the SCSI (hard drive activity LED) connector.
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RST: Reset Switch
Supporting the reset function requires connecting pins 5 and 7 to a momentary-contact switch that
is normally open. When the switch is closed, the board resets and runs POST.
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MSGLED: Power / Sleep / Message Waiting LED
Connecting pins 2 and 4 to a single- or dual-color, front panel mounted LED provides power on/off,
sleep, and message waiting indication.
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PWRSW: Power Switch
Supporting the power on/off function requires connecting pins 6 and 8 to a momentary-contact
switch that is normally open. The switch should maintain contact for at least 50 ms to signal the
power supply to switch on or off. The time requirement is due to internal de-bounce circuitry. After
receiving a power on/off signal, at least two seconds elapses before the power supply recognizes
another on/off signal.
SG-72
Chapter 2