Iridium SHOUT ns General Description Manual page 36

Once motion has been detected using the motion detection algorithm, the device will be
considered in motion and report formats which support motion indication will have the motion
indicator set. While in motion, the device will switch to a different algorithm for detecting the
end of motion. The device will be considered motionless if there is a certain duration of calm.
The definition of calm for this algorithm differs depending on whether the device is awake or
sleeping. While awake a single TTL pulse will reset the calm timer whereas while sleeping the
same algorithm used for detecting the start of motion is used to detect motion that will reset
the calm timer. An example of this algorithm is shown in Figure 12.
6.2.2.1.2.1 Window Count
This setting specifies the number of contiguous windows for the motion detection
algorithm. If set to 0, then a single TTL pulse from the motion sensor will satisfy the motion
detection algorithm. The AT command associated with this setting is ^MSB.
6.2.2.1.2.2 Sensitivity
This setting specifies the minimum number of motion sensor TTL pulses that must be
detected in order to satisfy a single motion detection window for the motion detection
algorithm. The AT command associated with this setting is ^MSB.
NAL Research Corporation (451-01001.B)
Figure 11. Motion detection example.
Figure 12. End of motion example.
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