Table 2.

The onboard user interface indications given by the LED behavior.

LED	LED status	Meaning
RED	OFF	System turned off
	ON	System powered
	BLINKING	Sensor fault (the user must see the log file to get more information)
GREEN	ASYNCHRONOUS BLINKING	Data exchange activity between CPU and SD memory
YELLOW	OFF	System active, monitoring not active
	FAST BLINKING	The system is performing the port scanning to find which devices are connected
	SLOW BLINKING	The shut-down procedure is going on following the shut-down button pressing
	ON	Monitoring active