Digital Matter Support

Battery Powered Devices - Overview of Operations

Types of Tracking

Movement based/Trip Tracking:

Digital Matter devices revolve around the concept of 'a Trip' for their tracking, and there are several ways you can commence and end a trip.
There are multiple methods of beginning and ending trips; Emulated, Jostle mode and Turn by Turn Tracking for the Falcon.

Periodic:

You can also disable trip tracking and get heartbeats only. This is called periodic only tracking in the battery powered and Narrowband low power (Sigfox/LoRaWAN) product ranges.
You can use the Periodic tracking mode to give you a position update on a schedule for greater battery life.

Note:

This mode will disable any Trip based parameters such as "In Trip Logging/Upload"

 Wired Devices

For Wired Device Overview of Operations click here


Trip Tracking Modes

Digital Matter devices revolve around the concept of 'a Trip' for their tracking, and there are several ways you can commence and end a trip. There are multiple methods of beginning and ending trips

  1. Emulated Trip
  2. Jostle Mode
  3. Turn by Turn Tracking

Emulated Ignition:

(All devices except Yabbys)

  • The device waits in a low power sleep state for accelerometer activity.
  • Once woken, it checks the GPS for movement over a period of a few seconds. 
  • If the GPS shows movement over the start threshold, a trip is started.
  • If this is not the case, the device then resumes sleeping, with both the GPS and mobile data off. 
    • For wired devices, both the GPS and cellular modem will be kept on. It will upload a record according to the parameters in the "Logging" tab in OEM.
    • For battery powered devices, the GPS logs according to the 'in trip logging period' and will batch upload according to the 'In trip upload period'
  • Once the asset has been stationary for some time, or the GPS signal has been lost for some time, the trip is ended, and a final upload is performed.

Jostle Mode

(Available on all battery powered devices)

In Jostle mode, the device uses its accelerometer to detect movement. Operation is as follows:

  • Accelerometer wakes the unit
    • By default, a wake filter is applied. The filter only starts a trip when it has seen 1 second’s worth of above-threshold movement in a 4 second period, or repeated short movements over several 4 second periods. Disabling the filter results in any accelerometer movement above the Wakeup Threshold (in Accelerometer Settings section of System Parameters) waking the unit.
  • Unit immediately determines it is moving – this is the same as entering a trip.
  • Once moving, the accelerometer no longer wakes the unit
  • It wakes every two minutes on a timer, and does two things:
    • Asks the accelerometer if there was any movement in the last 2 minutes
    • If it is time to log a position, it gets a fix and records it
  • Once the accelerometer claims there has been no movement for a while, (default is 5 mins - Movement End Time parameter), the device declares movement has stopped.
  • If the device also has a GPS, it will also wait until the speed reported by the GPS has dropped to 0, to prevent movement ending when the movement is very steady and constant – e.g. a train where acceleration is minimal

Turn by Turn GPS Tracking

(Falcon only)

Once the device determines it is moving, via either wired ignition or emulated ignition, this mode enables a change of behaviour so instead of turning the GPS on, achieving a fix, turning off and uploaded the data then waiting until the next logging period has elapsed, the device will:

  • Leave the GPS on to get fixes easier
  • Keeps the modem communicating and uploads each fix immediately after it qualifies as a valid fix

Did you find it helpful? Yes No

Send feedback
Sorry we couldn't be helpful. Help us improve this article with your feedback.