User's Guide

Model: VSM3

Positioning Universal, Inc. - Confidential & Proprietary

5.5 Sleeping or Stopped to Moving through Ignition ON

A device enters Moving state if a hardwired Ignition ON is detected. A 1 second

debounce is used on the ignition input to avoid “chatter”.

5.6 Sleeping or Stopped to Moving through Virtual Ignition

If the absolute voltage VIN is changed by the amount specified then the unit is put in

Moving state. This event will trigger if voltage increases or decreases by the specified

percentage. Sampled every 5 seconds. This event will not be generated at all if the device

is running off backup battery or if Ignition On has already been sensed.

5.7 Stopped to Moving through Movement

There are two elements of a stopped to moving transition. A number of consecutive

locations at a threshold speed value and, optionally, a minimum moving distance. GPS

fixes are received at 5HZ. The thresholds include the minimum speed that device must

travel to be considered for state transition, the number of consecutive fixes at this

minimum speed in order for a transition to Moving state, and optionally, a minimum

distance a device must travel at or above this speed.

5.8 Sleeping to Stopped through Absolute G change

If the absolute sum of the 3 axis accelerometer changes by the specified percentage then

the unit is put in Moving state.

5.9 Sleeping to Stopped through Vibration

If the MEMs vibration sensing algorithm detects vibration, shock, or acceleration values

that exceed the specified thresholds in a device in Sleeping state, then the device will

wake up and enter Stopped mode.

5.10 Sleeping to Stopped through Heartbeat

If the Heartbeat timer expires when the device is in Sleeping state, it will wake up and

enter Stopped mode. Depending on configuration, the device may attempt a GPS fix

before sending a Heartbeat message.

5.11 Stopped to Sleeping through Quiescence

The Stopped to Sleep transition occurs when:

● no accelerometer trigger events occur in specified time period

● no UDP packets are received during specified time period