© 2018 M-Labs Technologies
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3.4 Power Modes
The PM-L device supports several power modes that are set by the power mode command. In
full power mode the GPS is active and the cellular subsystem will maintain a persistent
cellular connection whenever service is available. IP connection is maintained according to
the configuration of the device.
The device can be put into several levels of low power mode whenever it runs on the internal
backup battery, or if the external input voltage is low or if it is not moving depending on how
the unit is configured through AT commands.
Power Mode
Cellular
GPS
Full Power (Track)
On
On
Listen
On
Off
Stealth
Off
Off
The device would return to full power whenever an event occurs that triggers a report. Those
events include:
Report timer
GPIO change
IP change
Battery threshold
Heartbeat
Watchdog
Power-up
Motion Detected
Any hardware or software reset will return the device to full power mode.
3.5 Report
The PM-L captures data and forms a report record with that data. A report is a data structure
containing all of the sensory and other typically useful data on the device. Reports are
generated in response to specified events, such as periodic timeout, speed threshold,
geo-fence crossing, etc., or in response to a Report Now command.
Report Queuing
If a report trigger occurs while UDP connection is unavailable, it will be queued until
connection becomes available and transmitted at such time. The only way report(s) can be lost
is if too many reports are queued and the report-queue is overflowing. In such case the earliest
report(s) will be discarded. The size of the queue can be configured via the Report Queue
command.