Status Leds - ADLINK Technology COM Express cExpress-BL User Manual

4.2.

Status LEDs

To facilitate easier maintenance, status LED's are mounted on the board.
LED Descriptions
Name Color
LED1 Blue
LED2 Green
LED3 Red
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Connection Function
BMC output Power Sequence Status Code (BMC)
Power Changes, RESET
(see 5.1.4 Exception Codes below)
Power Source 3Vcc S0
S3/S4/S5
ECO mode
BMC output Module power up
Watchdog counting
and same signal as WDT
Watchdog timed out
(B27) on BtB connector
Watchdog RESET
Rebooted after WD RESET WD LED = LED ON
Rebooted after PWRBTN WD LED = LED ON
Rebooted after RESET BTN WD LED = LED OFF
Note: only a RESET not initiated by the BMC can clear the WD LED (user action)
LED ON
LED OFF
LED OFF
WD LED = LED OFF
WD LED = LED OFF
WD LED = LED ON
WD LED = LED ON