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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 28 / 115
4.1
LED
STM 550B contains an indication LED used to provide user feedback. By default, the LED will
blink shortly whenever a telegram is transmitted. This indication can be disabled using the
LED_MODE register of the NFC interface as described in chapter 9.5.16.
In addition to that, the LED provides a response to LRN button inputs as described below.
4.2
LRN button
Most STM 550B device parameters can be configured using the NFC interface as described in
chapter 8 and 9. Some of the most common parameters or states can additionally be config-
ured using the LRN button.
Table 4 below lists those LRN button actions with the corresponding STM 550B response and
LED feedback.
Type
Timing
STM 550B Response
LED Feedback
1 x short < 1s Press
Exit from Sleep Mode
Send Commissioning Telegram
Success: 1 short blink
Error: No feedback
2 x short
< 1s Press,
Start Function Test
(End after 2 min or upon any
button press)
Transmit sensor status
with highest possible up-
date rate
< 1s Release,
< 1s Press
3 x short
< 1s Press,
Toggle LED indication
LED enabled: 2 short blinks
LED disabled: No feedback
< 1s Release,
< 1s Press,
< 1s Release,
< 1s Press
4 x short
< 1s Press,
Start Acceleration Test
Start of test: 4 short blinks
During test: 1 short blink
whenever acceleration
above threshold is de-
tected
< 1s Release,
< 1s Press,
< 1s Release,
< 1s Press
< 1s Release,
< 1s Press
1 x long
3s < Press < 5s
Enter Sleep Mode
(Disable LED and Radio)
Success: 3 short blinks
Error: No feedback
Very
Long
> 8s Press
Factory Reset
Success: 5 short blinks
Error: No feedback
Table 4
–
STM 550B user interface actions