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When the network has been established the LED will first blink green rapidly
and next stay green (or flashes 1 sec. on/1 sec. off in case the unit has not
been configured yet).
In a battery-operated unit a time-out occurs after 3 minutes, after which the
communication module switches off in order to save the batteries. In this
low power mode the LED flashes once per 3 seconds. It will
search for network connection once it needs to send
notifications. It can also been forced to establish a network
connection by re-inserting the batteries or pressing the
button at the back for 5 seconds.
If the CML4255 is connected to an external power supply, it has continuous
network connection and is permanently in program mode.
