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When Activation Timeout is reached and Ignition is still in OFF state, FMB900
monitors
accelerometer data. If Acceleration or Angle value reaches configured threshold for configured
Duration (in ms), check Ignition state. If Ignition is still OFF during configured "Ignition check after
Event Timeout" time, then event is generated. If configured - sends sms event or makes a call.
Function will be reactivated after FMB900 again detects change of Ignition state from ON to OFF.
Activation timeout – Activation timeout is time after which FMB900 turns ON
Towing detection function if other requirement is met (Ignition OFF state detected). It is
measured in minutes.
Ignition check after event – defines time period (in seconds) to check ignition state
when Acceleration or Angle value reach. If towing event is generated during this time period, it is
skipped. It allows to filter out redundant towing events while entering the car.
Make Call to – if function enabled makes call to specified phone number
(configured
in
predefined
numbers)
Acceleration, Angle – values used to detect towing when ignition is OFF
Duration – defines time period to check Acceleration, Angle values.
5.11.2
Crash Detection
Crash
Detection
functionality
can
be
set
according
to
these
settings:
Threshold (mg)
Duration
(ms)
If accident happens and FMB900 detects acceleration value higher than set threshold value
during set time period, then device will generate an event. Threshold and duration values are set
depending of accident power which you want to detect. FMB900 can detect a slight tapping on the
device (Threshold=100mg, Duration=1ms) or can detect severe accident (Threshold=4000mg,
Duration=5ms)..
Crash Trace operation
If trace is enabled FMB will collect acceleration data every 40 msec., аnd in the deep-sleep mode
too. Buffer is big enough to hold data for 5 seconds and on Crash Event detection, records will be
generated from this buffer, following these conditions:
Every second,
Acceleration changed more then > 50mG,
Data will be collected and records generated 5 seconds after the event using the same conditions.
Every generated record will have accelerometer X Y Z values included. Each record will have accurate
timestamps in milliseconds.
Usually between 20 to 30 records is generated on crash event detection.