USER MANUAL
STM 550 / EMSI
–
ENOCEAN MULTISENSOR FOR IOT APPLICATIONS
© 2020 EnOcean | www.enocean.com F-710-017, V1.0
STM 550 / EMSI User Manual | v1.3 | September 2020 | Page 12/97
2.2.1
Standard operation mode
During standard operation, STM 550 wakes up periodically and reports the current sensor
status using data telegrams. The STM 550 wake-up timer is by default configured to wake-
up STM 550 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 550 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 550 and is the out of the box state
of STM 550 upon delivery. It is intended to be used during extended periods without operation
such as device storage or transport.
In standby mode, STM 550 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 9.5.11. Upon
entering standby mode, STM 550 will send a SIGNAL telegram of type 0x0E as described in
chapter 5.2.7.
2.2.3
Learn mode
In learn mode, STM 550 will transmit a Teach-in telegram to communicate its source address
(EURID), the EnOcean Equipment Profile (EEP) that it currently uses and
–
if applicable -
security mode and security information to a receiver. After that transmission, STM 550 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 9.5.11.
2.2.4
Function test mode
In Function Test Mode, STM 550 will measure and report the status of the integrated sensors
at the highest possible rate to verify the sensor functionality.
STM 550 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 9.5.11.
Function Test Mode will be stopped once the LRN button is pressed or the functional mode is
changed via the NFC interface.