Intel D2550DC2 Technical product specification - Page 48

States for a One-Color Power LED, Hard Drive Activity LED Header

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Intel Desktop Board D2550DC2 Technical Product Specification 2.2.2.4.1 Hard Drive Activity LED Header Pins 1 and 3 can be connected to an LED to provide a visual indicator that data is being read from or written to a hard drive. 2.2.2.4.2 Reset Switch Header Pins 5 and 7 can be connected to a momentary single pole, single throw (SPST) type switch that is normally open. When the switch is closed, the board resets and runs the POST. 2.2.2.4.3 Power/Sleep LED Header Pins 2 and 4 can be connected to a single- or dual-color LED. Table 20 shows the default states for a single-color LED. Table 20. States for a One-Color Power LED LED State Description Off Power off/hibernate (S5/S4) Blinking Sleeping (S3) Steady Green Running/Away (S0) NOTE The LED states listed in Table 20 are default settings that can be modified through BIOS setup. Systems built with a dual-color front panel power LED can also use alternate color state options. 2.2.2.4.4 Power Switch Header Pins 6 and 8 can be connected to a front panel momentary-contact power switch. The switch must pull the SW_ON# pin to ground for at least 50 ms to signal the power supply circuitry to switch on or off. (The time requirement is due to internal debounce circuitry on the board.) At least two seconds must pass before the power supply circuitry will recognize another on/off signal. 48

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Intel Desktop Board D2550DC2 Technical Product Specification
48
2.2.2.4.1
Hard Drive Activity LED Header
Pins 1 and 3 can be connected to an LED to provide a visual indicator that data is
being read from or written to a hard drive.
2.2.2.4.2
Reset Switch Header
Pins 5 and 7 can be connected to a momentary single pole, single throw (SPST) type
switch that is normally open.
When the switch is closed, the board resets and runs the
POST.
2.2.2.4.3
Power/Sleep LED Header
Pins 2 and 4 can be connected to a single- or dual-color LED.
Table 20 shows the
default states for a single-color LED.
Table 20.
States for a One-Color Power LED
LED State
Description
Off
Power off/hibernate (S5/S4)
Blinking
Sleeping (S3)
Steady Green
Running/Away (S0)
NOTE
The LED states listed in Table 20 are default settings that can be modified through
BIOS setup.
Systems built with a dual-color front panel power LED can also use
alternate color state options.
2.2.2.4.4
Power Switch Header
Pins 6 and 8 can be connected to a front panel momentary-contact power switch.
The
switch must pull the SW_ON# pin to ground for at least 50 ms to signal the power
supply circuitry to switch on or off.
(The time requirement is due to internal debounce
circuitry on the board.)
At least two seconds must pass before the power supply
circuitry will recognize another on/off signal.