USER MANUAL
STM 550X / EMSIX
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ENOCEAN MULTI-SENSOR
© 2020 EnOcean | www.enocean.com F-710-017, V1.0
STM 550x / EMSIx User Manual | v1.0 | February 2020 | Page 24/79
3.5
Acceleration sensor
STM 550x integrates an acceleration sensor which provides two types of data:
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Acceleration vector orientation
This allows determining the direction into which STM 550x is either accelerated
(moved) or permanently oriented (positioned relative to the earth gravity vector).
See chapter 9.2 for an example.
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Acceleration vector change
This allows determining if STM 550x is moved or shaken
The second case (acceleration vector change) can be used to determine the presence or
absence of small vibrations (acceleration vector changes). Examples use cases causing such
small vibrations include asset utilization (e.g. a motor to which STM 550x is attached is run-
ning) or asset movement (e.g. an asset to which STM 550x is attached changes its location).
If such change in acceleration is above a certain threshold then this will be reported as part
of the regular data telegram. If the acceleration exceeds this threshold for the first time,
then this will be reported immediately (wake-on-acceleration).
Figure 14 below shows the orientation of the acceleration vector relative to STM 550x.
Figure 14
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Acceleration sensor orientation
