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EnOcean EASYFIT STM 550 User Manual

Multisensor for iot applications
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USER MANUAL
STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS
EnOcean Multisensor For IoT Applications
STM 550 / EMSI
03.09.2020
Observe precautions! Electrostatic sensitive devices!
Patent protected:
WO98/36395, DE 100 25 561, DE 101 50 128,
WO 2004/051591, DE 103 01 678 A1, DE 10309334,
WO 04/109236, WO 05/096482, WO 02/095707,
US 6,747,573, US 7,019,241
© 2020 EnOcean | www.enocean.com F-710-017, V1.0
STM 550 / EMSI User Manual | v1.3 | September 2020 | Page 1/97

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  • Page 1 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS EnOcean Multisensor For IoT Applications STM 550 / EMSI 03.09.2020 Observe precautions! Electrostatic sensitive devices! Patent protected: WO98/36395, DE 100 25 561, DE 101 50 128, WO 2004/051591, DE 103 01 678 A1, DE 10309334,...
  • Page 2 As far as patents or other rights of third parties are concerned, liability is only assumed for modules, not for the described applications, processes and circuits. EnOcean does not assume responsibility for use of modules described and limits its liability to the replacement of modules determined to be defective due to workmanship. Devices or systems containing RF components must meet the essential requirements of the local legal authorities.
  • Page 3 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS TABLE OF CONTENT General description ..................7 Basic functionality ..................7 Product variants .................... 8 Technical data ....................9 Environmental conditions ................9 Packaging information .................. 10 1.5.1 STM 550 .....................
  • Page 4 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS Radio communication ................... 30 Radio Frame format ..................30 5.1.1 ERP1 frame format ................30 5.1.2 ERP2 frame format ................30 EnOcean Equipment Profiles (EEP) and SIGNAL telegrams ........ 31 5.2.1...

  • Page 5: Security_Key_Mode

    USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS NFC HEADER....................50 9.4.1 NFC HEADER area structure ..............50 CONFIGURATION ..................51 9.5.1 Using the NFC configuration functionality ..........51 9.5.2 CONFIGURATION area structure ............51 9.5.3 NFC_PIN_CODE ...................
  • Page 6 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 11.5 Magnet contact sensing ................88 11.6 Energy harvesting ..................88 11.7 NFC configuration ..................89 Regulatory notes ..................90 12.1 European Union................... 90 12.1.1 Declaration of conformity ..............90 12.1.2...
  • Page 7 STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS General description This user manual describes the functionality of the STM 550 EnOcean multisensor module, of the STM 550 Installation Kit and the EMSI Easyfit Multisensor in the following frequency variants: STM 550, STM 550 KIT and EMSIA using 868.3 MHz radio (main market Europe)
  • Page 8 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS Product variants STM 550 is available in three different product and packaging variants: STM 550 is the multisensor module in original PTM module form factor intended for ◼...
  • Page 9 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS Technical data Antenna Integrated helix antenna STM 550: 868.300 MHz / +5 dBm Transmission frequency / power STM 550U: 902.875 MHz / + 99 dBµV STM 550J: 928.350 MHz / 0 dBm...
  • Page 10 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS Packaging information 1.5.1 STM 550 STM 550 is delivered in a box of 100 units packed onto 10 trays of 10 units each. Packaging Unit 100 units Packaging Method...
  • Page 11 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS Functional overview Product description The energy-harvesting multisensor module STM 550 provides wireless sensing functionality without batteries. Power is provided by a connected solar cell. STM 550 transmits sensor data using the EnOcean radio standard.
  • Page 12 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.
  • Page 13 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 2.2.5 Illumination test mode During installation, STM 550 can measure and report the amount of ambient light available at its solar cell in order to determine a suitable installation location as discussed in chapter 11.5.
  • Page 14 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS Reporting interval STM 550 will transmit its status as data telegram at a regular interval, the so-called reporting interval. By default, the reporting interval is 60 seconds, i.e. STM 550 will measure and report its status approximately once per minute.
  • Page 15 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 2.3.2 Standard reporting interval The standard reporting interval determines the default interval between two status updates of STM 550. The standard reporting interval can be adjusted using the STANDARD_TX_INTERVAL NFC register as described in chapter 9.5.12.
  • Page 16 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 2.3.3 Illumination-controlled reporting interval If sufficient ambient light is available, then it might be desirable to receive status updates more often. For this, there are typically two main use cases: Adjust the update rate based on the ambient light available for harvesting ◼...
  • Page 17 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 2.3.4 Temperature-controlled reporting interval In HVAC (heating, ventilation, air conditioning) applications it might be desirable to receive status updates more often if the measured temperature is significantly above or below the target value.
  • Page 18 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 2.3.5 Humidity-controlled reporting interval In HVAC (heating, ventilation, air conditioning) applications it might be desirable to receive status updates more often if the measured humidity is significantly above or below the target value.
  • Page 19 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 2.3.6 Acceleration-controlled reporting interval If an asset is in operation or it is being moved, then it might be desirable to receive status updates more often to determine its status or location.
  • Page 20 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 2.3.7 Magnet contact sensor-controlled reporting interval If a door or a window is opened when it normally should be closed (or vice versa), then it might be desirable to receive status updates more often to monitor its status. STM 550 can therefore be configured to use a lower reporting interval, i.e.
  • Page 21 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS Sensor functionality STM 550 integrates a set of sensors used to measure environmental parameters. The follow- ing chapters described their characteristics in detail. Light level sensor STM 550 integrates a dedicated light level sensor with narrow aperture and a spectral re- sponse optimized to mimic the human eye’s perception of ambient light.
  • Page 22 Figure 9 – Temperature sensor accuracy To determine the overall system accuracy, the quantization error (reporting step size) de- termined by the selected EnOcean Equipment Profile (EEP) has to be added to this value. Humidity sensor STM 550 integrates a high-performance humidity sensor achieving accuracy of better than +-3 % r.h.
  • Page 23 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS Acceleration sensor STM 550 integrates an acceleration sensor which provides two types of data: Acceleration vector orientation ◼ This allows determining the direction into which STM 550 is either accelerated (moved) or permanently oriented (positioned relative to the earth gravity vector).
  • Page 24 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 3.5.1 Wake on acceleration 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).
  • Page 25 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS Magnet contact sensor STM 550 integrates a magnet contact sensor detecting presence or absence of a magnetic field in the proximity of the it. Refer to Figure 13 and Figure 14 for the location of the mag- net contact sensor within STM 550 and to chapter 11.5 for mounting instructions.
  • Page 26 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS Product interface The STM 550 product interface consists of the following elements: LRN button and LED ◼ Solar cell harvesting energy from ambient light ◼ Ambient light sensor (co-located with the LED) ◼...
  • Page 27 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS STM 550 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 9.5.10.
  • Page 28 Figure 15 below. Figure 15 – Backup battery slot with polarity markings EnOcean recommends Renata CR1632 due to its low self-discharge and high capacity. Gloves should be used when installing a backup battery to avoid contamination of the isolation area between the contacts that could lead to a higher self-discharge.
  • Page 29 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS Product label Each STM 550 module contains a product label with a commissioning QR code. Figure 16 shows the STM 550 product label. STM 550U and STM 550J use the same label structure.
  • Page 30 As described above, STM 550 uses ERP1 as radio link while STM 550U and STM 550J use ERP2. Note that EnOcean radio transceivers such as TCM 310 or TCM 515 will convert both ERP1 and ERP2 into the same EnOcean Serial Protocol (ESP3) format so that this difference is normally not noticeable.
  • Page 31 The data section within EnOcean radio telegrams uses one of the EnOcean Equipment Pro- files (EEP) or one of the SIGNAL telegram types defined by EnOcean Alliance to encode sensor information. The EEP used is selected by the sender and must be supported by the receiver.
  • Page 32 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 5.2.2 EEP structure Each EEP is identified using three fields: RORG ◼ RORG identifies the high-level telegram type, e.g. rocker switch telegram (RPS), one- byte sensor telegram (1BS), four-byte sensor telegram (4BS), variable length tele- gram (VLD), Universal Teach-in with EEP (UTE), etc.
  • Page 33 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 5.2.3 1BS telegram 1 Byte Sensor (1BS) telegrams are identified by the RORG field being set to 0xD5 which is followed by one byte of payload (Bit0 … Bit7. 1BS telegrams are used exclusively to encode...
  • Page 34 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 5.2.7 Signal telegram SIGNAL telegrams are used to encode generic system conditions independent of specific sensor functionality of the device. Examples of such system conditions are internal energy level, available ambient energy and backup battery status.
  • Page 35 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS Security STM 550 implements the security handling functions as specified in the EnOcean security specification: https://www.enocean-alliance.org/sec/ Basic concepts Security for radio transmission addresses two main issues: Unauthorized interception (reception and correct interpretation) of transmitted data ◼...
  • Page 36 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 6.1.2 Telegram authentication The goal of telegram authentication is to prevent unauthorized senders to transmit apparently valid commands causing the receiver to perform unauthorized actions. Telegram authentication works by creating a message signature (often called Cipher-based Message Authentication Code or CMAC in short) based on the content of the telegram and the secret key.
  • Page 37 The change of telegram data or security key is typically ensured by means of monotonously incrementing counters. The value of such counter is then used to either modify the telegram payload or derive a dynamic key from the device security key. EnOcean systems use the latter approach.
  • Page 38 6.2.1 EURID The EURID identifies the sender of each radio telegram using a unique 6 byte value. The EURID of an EnOcean device is assigned at manufacturing and cannot be changed. 6.2.2 Security key The security key is a random 128 Bit (16 byte) value that is known only to the sender and the receiver(s).
  • Page 39 STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS STM 550 security implementation STM 550 supports both standard and high security modes as defined by EnOcean Alliance. The security mode can be selected both via the LRN button and via the NFC interface.
  • Page 40 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS Commissioning Commissioning is the process by which STM 550 is learned into a receiver (actuator, control- ler, gateway, etc.). The following two tasks are required in this process: Device identification ◼...
  • Page 41 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS Radio-based commissioning Radio-based commissioning is used to associate STM 550 with other devices by sending a dedicated radio telegram (a so-called commissioning telegram). To do so, STM 550 can transmit a dedicated teach-in telegram identifying its relevant pa- rameters as discussed in chapter 5.2.
  • Page 42 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS NFC interface STM 550 implements am NFC configuration interface that can be used to access (read and write) the STM 550 configuration memory and thereby configure the device as described in the following chapters.
  • Page 43 These options are described in more detail below. 8.3.1 PC with dedicated NFC reader For PC-based applications, EnOcean recommends the TWN4 Multitech 2 HF NFC Reader (or- der code T4BT-FB2BEL2-SIMPL) from Elatec RFID Systems (sales-rfid@elatec.com). This reader is shown in Figure 25 below.
  • Page 44 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS NFC interface functions For a detailed description about the NFC functionality, please refer to the ISO/IEC 14443 standard. For specific implementation aspects related to the NXP implementation in NT3H2111,...
  • Page 45 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 8.4.2 IDLE state IDLE is the waiting state after a Power-On Reset (POR), i.e. after the NFC tag has been in- troduced into the magnetic field of the NFC reader.
  • Page 46 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 8.4.6 Read command The READ command requires a start page address, and returns the 16 bytes of four NFC tag pages (where each page is 4 byte in size).
  • Page 47 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 8.4.8 Password authentication (PWD_AUTH) command The protected memory area can be accessed only after successful password verification via the PWD_AUTH command. The PWD_AUTH command takes the password as parameter and, if successful, returns the password authentication acknowledge, PACK.
  • Page 48 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS NFC registers The NFC memory is organized in pages (smallest addressable unit) where each page contains 4 byte of data. Several pages with similar functionality form an NFC memory area.
  • Page 49 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS Device identification NDEF The NDEF area contains a device identification string using the NDEF (NFC Data Exchange Format) standard that is readable by most NFC-capable reader devices (including smartphones).
  • Page 50 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS NFC HEADER The NFC HEADER area contains information about the NFC memory structure and can therefore be used to distinguish between different NFC memory layouts. 9.4.1 NFC HEADER area structure The structure of the NFC HEADER area is shown in Figure 30 below.

  • Page 51: Table Of Contents

    USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS CONFIGURATION The CONFIGURATION area allows configuring the device parameters and is therefore the most important part of the NFC memory. Configuration registers larger than 8 bit use big endian format, i.e.
  • Page 52 The EnOcean Alliance Product ID uniquely identifies each product within the EnOcean Alli- ance ecosystem. The Product ID consists of a 2 byte manufacturer identification code (as- signed by EnOcean Alliance) and a 4 byte product identification code (assigned by the man- ufacturer.
  • Page 53 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 9.5.5 USER_KEY Each STM 550 module is pre-programmed at the factory with a randomly generated 128 bit security key (FACTORY_KEY). This key will by default be used to encrypt and authenticate STM 550 radio telegrams when operating in high security mode.
  • Page 54 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS The encoding for the SECURE LRN TELEGRAM bit field is shown in Table 11 below. SECURE LRN TELEGRAM Secure LRN telegram Secure LRN Telegram (containing security key) enabled...
  • Page 55 STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 9.5.8 The EEP register determines the EnOcean Equipment Profile (EEP) used by STM 550 for the transmission of data telegrams. Figure 35 below shows the structure of the EEP register.

  • Page 56: Signal

    USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 9.5.9 SIGNAL STM 550 supports reporting its energy status, the current energy delivery of the harvester and the backup battery status via SIGNAL telegrams as described in chapter 5.2.7.
  • Page 57 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 9.5.10 LED_MODE The LED_MODE register determines the brightness of the LED. Figure 37 below shows the structure of the LED_MODE register. LED_MODE (Default: 0x01) Bit 7 Bit 6...
  • Page 58 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 9.5.11 FUNCTIONAL_MODE The FUNCTIONAL_MODE register can be used to switch between the different functional modes of STM 550 as described in chapter 2.2. Figure 38 below shows the structure of the FUNCTIONAL_MODE register.
  • Page 59 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 9.5.12 STANDARD_TX_INTERVAL STM 550 uses a standard reporting interval which can be automatically adjusted based on sensor readings as described in chapter 2.3. The standard reporting interval is set by the register STANDARD_TX_INTERVAL shown in Figure 39 below.

  • Page 60: Threshold_Cfg2

    USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 9.5.13 THRESHOLD_CFG1 STM 550 can reduce the reporting interval based on the illumination of the solar cell, the light illumination of the light level sensor, the temperature or the humidity as described in chapter 2.3.
  • Page 61 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS The encoding used by the TEMP SENSOR bit field is shown in Table 21 below. TEMP SENSOR Reporting interval reduction based on temperature Disabled (No reporting interval reduction)
  • Page 62 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 9.5.14 THRESHOLD_CFG2 STM 550 can reduce the reporting interval based on the acceleration sensor status and the magnet contact status as described in chapter 2.3. The use of these reduced reporting intervals is enabled by the THRESHOLD_CFG2 register shown in Figure 41 below.

  • Page 63: Rfu

    USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 9.5.15 LIGHT_SENSOR_CFG STM 550 allows the user to select if the reported light level is the one measured by the am- bient light sensor or the one measured by the solar cell. Refer to chapter 3.1 for a descrip- tion of the ambient light sensor and to chapter 3.2 for a description of the solar cell func-...
  • Page 64 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 9.5.16 ACC_SENSOR_CFG The operation parameters of the acceleration sensor in STM 550 can be configured using the ACC_SENSOR_CFG registers shown in Figure 43 below. Refer to chapter 3.5 for a de- scription of the acceleration sensor function.
  • Page 65 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 9.5.17 SOLAR_THRESHOLD If reduction of the reporting interval based on the solar cell light level has been enabled then the light level threshold is defined by SOLAR_THREHOLD register as shown in Figure 44 below.

  • Page 66: Solar_Tx_Interval

    USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 9.5.18 SOLAR_TX_INTERVAL If solar cell illumination-controlled reporting has been enabled and the solar cell illumina- tion is above the defined threshold then the resulting reporting interval will be determined by the register SOLAR_TX_INTERVAL shown in Figure 45 below.
  • Page 67 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 9.5.19 LIGHT_THRESHOLD If reduction of the reporting interval based on the light level measured by the light sensor has been enabled then the light level threshold is defined by LIGHT_THREHOLD register as shown in Figure 46 below.

  • Page 68: Light_Tx_Interval

    USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 9.5.20 LIGHT_TX_INTERVAL If solar cell illumination-controlled reporting has been enabled and the solar cell illumina- tion is above the defined threshold then the resulting reporting interval will be determined by the register LIGHT_TX_INTERVAL shown in Figure 47 below.
  • Page 69 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 9.5.21 ACCELERATION_THRESHOLD If reduction of the reporting interval based on acceleration has been enabled then the ac- celeration threshold is defined by ACCELERATION_THREHOLD register as shown in Figure 48 below.
  • Page 70 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 9.5.22 ACCELERATION_TX_INTERVAL If acceleration-controlled reporting has been enabled and the acceleration exceeds the de- fined acceleration threshold then the resulting reporting interval will be determined by the register ACCELERATION_TX_INTERVAL shown in Figure 49 below.
  • Page 71 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 9.5.23 TEMPERATURE_THRESHOLD If reduction of the reporting interval based on the temperature has been enabled then the temperature threshold is defined by TEMPERATURE_THREHOLD register as shown in Figure 50 below.
  • Page 72 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 9.5.24 TEMPERATURE_TX_INTERVAL If temperature-controlled reporting has been enabled and the temperature meets the de- fined threshold criteria then the resulting reporting interval will be determined by the regis- ter TEMPERATURE_TX_INTERVAL shown in Figure 51 below.
  • Page 73 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 9.5.25 HUMIDITY_THRESHOLD If reduction of the reporting interval based on the humidity has been enabled then the hu- midity threshold is defined by HUMIDITY_THREHOLD register as shown in Figure 52 below.
  • Page 74 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 9.5.26 HUMIDITY_TX_INTERVAL If humidity-controlled reporting has been enabled and the humidity meets the defined threshold criteria then the resulting reporting interval will be determined by the register HUMIDITY_TX_INTERVAL shown in Figure 53 below.
  • Page 75 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 9.5.27 MAGNET_CONTACT_TX_INTERVAL If magnet contact-controlled reporting has been enabled and the magnet contact state matches the state configured in the THRESHOLD_CFG2 register then the resulting reporting interval will be determined by the register MAGNET_CONTACT_TX_INTERVAL shown in Fig- ure 54 below.
  • Page 76 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 9.5.28 ILLUMINATION_TEST_RESULT If STM 550 has executed an illumination test as described in chapter 2.2.5 then the result (the measured average light level at the solar cell) will be stored in the ILLUMINA- TION_TEST_RESULT register shown in Figure 55 below.
  • Page 77 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS Mechanical interface STM 550 implements the mechanical interface of the PTM 21x module which is described in more detail in this chapter. All dimensions and tolerances given are in millimetres unless otherwise noted.
  • Page 78 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 10.2 Bottom view Figure 57 below shows the STM 550 module seen from the bottom. Figure 57 – Bottom view of STM 550 module © 2020 EnOcean | www.enocean.com F-710-017, V1.0...
  • Page 79 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 10.3 Cut view (A-A) Figure 58 below shows a cut along the A-A line of Figure 56 and highlights the area of the mounting structure (B region) in more detail.
  • Page 80 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 10.5 Side view Figure 60 below shows the STM 550 module seen from the side. Figure 60 – Side view of STM 550 module © 2020 EnOcean | www.enocean.com F-710-017, V1.0...
  • Page 81 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS Installation recommendations 11.1 Setup instructions Before installing STM 550 into its intended location, a sufficient initial charge should be pro- vided to STM 550 and its correct operation should be verified.
  • Page 82 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 11.2 Temperature and humidity sensor The dedicated temperature and humidity sensor integrated into STM 550 accurately measures and reports temperature and humidity present at its surface. To achieve the best...
  • Page 83 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 11.3 Acceleration sensor Acceleration sensors measure the acceleration vector in all three dimensions {x; y; z}. This sensor can be used both to determine the device orientation (relative to the earth gravity vector) and the device acceleration (e.g.
  • Page 84 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS Figure 64 below illustrates this issue in a practical use case: The position of the window in the left case (window tilt) could be detected if STM 550 ◼...
  • Page 85 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 11.3.2 Device acceleration use cases If an object vibrates or is moved after being, then the acceleration vector measured by the acceleration sensor will change. Figure 65 below illustrates this.
  • Page 86 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 11.4 Illumination measurement STM 550 offers the option to measure the ambient light level either via the ambient light sensor or via the solar cell. This can be configured using the LIGHT_SENSOR_CFG register of the NFC interface as described in chapter 9.5.15.
  • Page 87 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS on the spectral properties of the ambient light. Calibration at the receiver is suggested to obtain best results for the given lighting situation. © 2020 EnOcean | www.enocean.com F-710-017, V1.0...
  • Page 88 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 11.5 Magnet contact sensing If STM 550 is used to detect the presence of a magnet using its magnet contact sensor (e.g. for door or window monitoring), then the magnet has to be in close proximity to the STM 550 magnet contact sensor for the case where a “Magnet Present”...
  • Page 89 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 11.7 NFC configuration STM 550 can be flexibly configured for a wide range of application scenarios using the NFC configuration interface as described in chapters 8 and 9.
  • Page 90 12.1.1 Declaration of conformity Hereby, EnOcean GmbH, declares that this radio equipment is in compliance with the essen- tial requirements and other relevant provisions of Directive 2014/53/EU. A copy of the Dec- laration of Conformity can be obtained from the product webpage at www.enocean.com...
  • Page 91 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 12.2 FCC (United States) 12.2.1 FCC Grant Of Equipment Authorization © 2020 EnOcean | www.enocean.com F-710-017, V1.0 STM 550 / EMSI User Manual | v1.3 | September 2020 | Page 91/97...
  • Page 92 Thus, STM 550U and EMSIU containing the TCM 515U radio module can be operated in the United States without additional Part 15 FCC approval (approval(s) for unintentional radiators may be required for the OEM’s finished product), under EnOcean’s FCC ID number if the OEM requirements are met.
  • Page 93 STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 12.2.4 FCC OEM requirements In order to use EnOcean’s FCC ID number, the OEM must ensure that the following conditions are met: The Original Equipment Manufacturer (OEM) must ensure that FCC labeling require- ◼...
  • Page 94 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 12.3 ISED (Industry Canada) 12.3.1 ISED Technical Acceptance Certificate © 2020 EnOcean | www.enocean.com F-710-017, V1.0 STM 550 / EMSI User Manual | v1.3 | September 2020 | Page 94/97...
  • Page 95 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 12.3.2 ISED (Industry Canada) regulatory statement This device complies with Industry Canada licence-exempt RSS standard(s). Operation is subject to the following two conditions: (1) this device may not cause interference, and (2) this device must accept any interference, including interference that may cause undesired operation of the device.
  • Page 96 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 12.4 ARIB (Japan) 12.4.1 ARIB construction type conformity certificate © 2020 EnOcean | www.enocean.com F-710-017, V1.0 STM 550 / EMSI User Manual | v1.3 | September 2020 | Page 96/97...
  • Page 97 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS Product history Table 40 below lists the product history of STM 550. Revision Release Key changes versus previous revision DA-04 Mar 2020 Initial release for lead customers DA-05...

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