Technical Reference
71
2.8.3.1.2 Reset Switch Connector
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 Desktop Board D845PEBT2 resets and runs
the POST.
2.8.3.1.3 Power/Sleep/Message Waiting LED Connector
Pins 2 and 4 can be connected to a one- or two-color LED. Table 49 shows the possible states for
a one-color LED. Table 50 shows the possible states for a two-color LED.
Table 49. States for a One-Color Power LED
LED State Description
Off Power off/sleeping
Steady Green Running
Blinking Green Running/message waiting
Table 50. States for a Two-Color Power LED
LED State Description
Off Power off
Steady Green Running
Blinking Green Running/message waiting
Steady Yellow Sleeping
Blinking Yellow Sleeping/message waiting
✏ NOTE
To use the message waiting function, ACPI must be enabled in the operating system and a
message-capturing application must be invoked.
2.8.3.1.4 Power Switch Connector
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 Desktop Board D845PEBT2.)
At least two seconds must pass before the power supply will recognize another on/off signal.
2.8.3.2 Auxiliary Front Panel Power/Sleep/Message-Waiting LED Connector
Pins 1 and 3 of this connector duplicate the signals on pins 2 and 4 of the front panel connector.
Table 51. Auxiliary Front Panel Power/Sleep/Message-Waiting LED Connector
Pin Signal Name In/Out Description
1 HDR_BLNK_GRN Out Front panel green LED
2 Not connected
3 HDR_BLNK_YEL Out Front panel yellow LED
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