User manual

Technical Reference

2.2.4.3.3 Power/Sleep LED Header

Pins 2 and 4 can be connected to a one- or two-color LED. Table 19 and Table 20 show the

possible LED states.

Table 19. States for a One-Color Power LED

LED State

Description

Off

Power off

Blinking

Standby

Steady

Normal operation

Table 20. States for a Dual-Color Power LED

LED State Description

Off Power off

Secondary color blinking

(amber)

Standby

Primary color steady (white)

Normal operation

NOTE

The LED behavior shown in Table 19 is default – other patterns may be set via BIOS setup.

2.2.4.3.4 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 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 will recognize another on/off signal.