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USER MANUAL
STM 550B / EMSIB - EASYFIT MULTISENSOR FOR IOT APPLICATIONS (2.4 GHZ BLE)
© 2020 EnOcean | www.enocean.com
F-710-017, V1.0
STM 550B / EMSIB User Manual | v1.3 | June 2020 | Page 12 / 115
2.2.1
Standard operation mode
During standard operation, STM 550B wakes up periodically and reports the current sensor
status using data telegrams. The STM 550B wake-up timer is configured to wake-up STM
550B approximately every 60 seconds. The wake-up intervals are affected at random (i.e. a
small random offset is added or subtracted) in order to increase the robustness of the radio
transmission and to comply with regulatory requirements.
If acceleration exceeding the configured threshold is detected for the first time after a period
without exceeding this threshold then STM 550B wakes up immediately (wake on acceleration
event).
Likewise, if the status of the magnet contact changes (from open to closed or vice versa)
then this is reported immediately as well (wake on magnet contact event).
2.2.2
Standby (Sleep) mode
Standby (sleep) mode is the lowest power mode of STM 550B and is the out of the box state
of STM 550B upon delivery. It is intended to be used during extended periods without oper-
ation such as device storage or transport.
In standby mode, STM 550B stops operation and conserves as much energy as possible. All
functionality
–
except those needed to return to standard operation mode
–
are disabled in
this mode.
Standby mode can be selected using the LRN button as described in chapter 4.1 or using the
MODE field of the FUNCTIONAL_MODE NFC register as described in chapter 9.5.17.
2.2.3
Learn mode
In learn mode, STM 550B will transmit a commissioning telegram as described in chapter 7.1
to communicate the device source address and security key to a receiver. After that trans-
mission, STM 550B will return to standard operation mode.
Learn mode can be selected using the LRN button as described in chapter 4.1 or using the
MODE field of the FUNCTIONAL_MODE NFC register as described in chapter 9.5.17.
2.2.4
Function test mode
In Function Test Mode, STM 550B will measure and report the status of the integrated sensors
at the highest possible rate to verify the sensor functionality.
STM 550B can be set into function test mode via the LRN button as described in chapter 4.1
or via the MODE field of the FUNCTIONAL_MODE NFC register as described in chapter 9.5.17.
Function Test Mode will be active for 120 seconds unless the LRN button is pressed before or
the functional mode is changed via the NFC interface.