i50 Manual (5.51)
Page 20
© 2018 Datalink Systems, Inc.
www.datalinksystemsinc.com
When entering sleep mode, the i50 will queue a sleep event, then wait until it is sent. The “Max Send
Wait Time” setting limits the maximum time the unit will wait in case there is no network coverage.
6.2.3 Returning to Awake Mode
While sleeping, the microprocessor uses these parameters to determine when it should wake up:
1) If an alarm input is toggled, enter awake mode.
2)
If any input is configured as “Priority” and is active, enter awake mode.
3)
If the “Wake on motion” bit is set and motion is detected, enter awake mode.
4) If the
“Sleep Pin” digital input is inactive, enter awake mode.
5)
If the “Periodic Wakeup” timer expires, enter periodic wakeup mode.
6) Otherwise stay asleep.
6.2.4 Periodic Wakeup
An optional timer can be configured using the “Periodic Wakeup” setting, which forces the unit to
send its position periodically during periods of sleep. During this wakeup period the unit will attempt
to obtain a GPS location and then send this to the server, before going straight back to sleep. The
“Max GPS/Send Wait Time” settings limit the maximum time the unit is awake, in case there is no
GPS or network coverage.
6.3 Motion
Asset motion is detected using the following techniques (in order of precedence):
1) If an accelerometer is installed, and the Use Accelerometer to Detect Motion option is enabled,
the i50 detects motion based on vibration measurements from the sensor. When
instantaneous vibrations exceed the programmable motion threshold, the i50 is moving. When
the one-second average vibrations are lower than the threshold, the i50 is stationary.
2) If any serial port is configured for OBD-II data, a non-zero OBD vehicle speed indicates i50 is
moving. A zero OBD speed reading, or no OBD data, implies i50 is stationary.
3) If GPS signal is valid, a GPS speed greater than the GPS Start Speed indicates motion. GPS
speed less than or equal to the GPS Stop Speed implies i50 is stationary.
The motion reading is used in the calculation of drive time, idle time, fuel used, idle fuel, start/stop
events, and tow alerts. It is also used to switch the city/highway reporting mode when the thresholds
are set to zero.
