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EnOcean STM 550X Series User Manual

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USER MANUAL
STM 550X / EMSIX – ENOCEAN MULTI-SENSOR
EnOcean Multi-Sensor
STM 550x / EMSIx
19.02.2020
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 550x / EMSIx User Manual | v1.0 | February 2020 | Page 1/79

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  • Page 1 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR EnOcean Multi-Sensor STM 550x / EMSIx 19.02.2020 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 550X / EMSIX – ENOCEAN MULTI-SENSOR TABLE OF CONTENT General description ..................6 Basic functionality ..................6 Product variants .................... 7 Technical data ....................7 Environmental conditions ................8 Packaging information ..................8 1.5.1 STM 550x ..................... 8 1.5.2...
  • Page 4 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR 4.1.2 ERP2 frame format ................27 EnOcean Equipment Profiles (EEP) and SIGNAL telegrams ........ 28 4.2.1 STM 550x supported EEP ..............28 4.2.2 EEP structure ..................29 4.2.3 1BS telegram ..................30 4.2.4...

  • Page 5: Security_Key_Mode

    USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR 8.5.4 PRODUCT_ID ..................49 8.5.5 USER_KEY ..................50 8.5.6 SECURITY_KEY_MODE ................50 8.5.7 SECURITY_MODE ................. 51 8.5.8 EEP ....................52 8.5.9 SIGNAL ....................53 8.5.10 LED_MODE ..................54 8.5.11 FUNCTIONAL_MODE ................55 8.5.12...
  • Page 6 Radio telegrams transmitted by STM 550x can be encrypted and authenticated using AES- 128 security based on a device-unique private key and a sequence counter in accordance to the EnOcean Alliance Security Specification. This ensures integrity, confidentiality and au- thenticity of the transmitted telegrams and prevents telegram replay (retransmission of pre- viously transmitted telegrams).
  • Page 7 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR Product variants EMSIx is a finished product combining STM 550x with a wall mount, a design frame, a magnet (for magnet sensor functionality) and an adhesive mounting tape into a ready to use product.
  • Page 8 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR Environmental conditions Operating Temperature -5 °C … +45 °C (indoor use in dry rooms only) Humidity 0% to 90% r.h. (non-condensing) Packaging information 1.5.1 STM 550x Packaging Unit 100 units Packaging Method 10 modules per tray, 10 trays per box 1.5.2...
  • Page 9 The energy-harvesting multi-sensor STM 550x using the STM 550x multisensor module pro- vides wireless sensing functionality without batteries. Power is provided by a connected solar cell. STM 550x transmits sensor data using the EnOcean radio standard. STM 550x operates fully self-powered (no batteries required) when sufficient available am- bient light (200 Lux for 6 hours per day) is available.
  • Page 10 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR Figure 3 below shows the external interfaces on the back side of the STM 550x module within EMSIx. The orientation indicator points towards the side where the magnet contact is located.
  • Page 11 The backup battery has to be installed with the positive pole point- ing upwards (i.e. towards the side of the solar cell). 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 12 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR Functional modes STM 550x supports six types of functional modes: Standard operation mode ◼ Standby (Sleep) mode ◼ Learn mode ◼ Function test mode ◼ Illumination test mode ◼ Factory reset mode ◼...
  • Page 13 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR 2.3.2 Standby (Sleep) mode Standby (sleep) mode is the lowest power mode of STM 550x and is the out of the box state of STM 550x upon delivery. It is intended to be used during extended periods without oper- ation such as device storage or transport.
  • Page 14 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR 2.3.5 Illumination test mode During installation, STM 550x 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 9.5.
  • Page 15 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR Reporting interval STM 550x will transmit its status as data telegram at a regular interval, the so-called report- ing interval. By default, the reporting interval is 60 seconds, i.e. STM 550x will measure and report its status approximately once per minute.
  • Page 16 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR 2.4.2 Standard reporting interval The standard reporting interval determines the default interval between two status updates of STM 550x. The standard reporting interval can be adjusted using the STANDARD_TX_INTERVAL NFC register as described in chapter 8.5.12. Consider the available energy before lowering the reporting interval as discussed in chapter 2.4.1.
  • Page 17 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR 2.4.3 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 18 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR 2.4.4 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 19 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR 2.4.5 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 20 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR 2.4.6 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 21 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR 2.4.7 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 550x can therefore be configured to use a lower reporting interval, i.e.
  • Page 22 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR Sensor functionality STM 550x integrates a set of sensors used to measure environmental parameters. The fol- lowing chapters described their characteristics in detail. Light level sensor STM 550x 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 23 Figure 12 – 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 550x integrates a high-performance humidity sensor achieving accuracy of better than +-3 % r.h.
  • Page 24 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR Acceleration sensor STM 550x integrates an acceleration sensor which provides two types of data: 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).
  • Page 25 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR 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 550x wakes up immediately (wake on acceleration event).
  • Page 26 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR Magnet contact sensor STM 550x integrates a magnet contact sensor detecting presence or absence of a magnetic field in the proximity of the it. Refer to Figure 2 and Figure 3 for the location of the magnet contact sensor within STM 550x and to chapter 9.5 for mounting instructions.
  • Page 27 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 28 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 29 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR 4.2.2 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 30 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR 4.2.3 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 31 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR 4.2.7 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 32 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR Security STM 550x 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 33 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR 5.1.2 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 34 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 the security key. EnOcean systems use the latter approach. Secret Key...
  • Page 35 5.2.1 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. 5.2.2 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 36 STM 550X / EMSIX – ENOCEAN MULTI-SENSOR STM 550x security implementation STM 550x 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 37 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR Commissioning Commissioning is the process by which STM 550x is learned into a receiver (actuator, con- troller, gateway, etc.). The following two tasks are required in this process: Device identification ◼...
  • Page 38 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR Radio-based commissioning Radio-based commissioning is used to associate STM 550x with other devices by sending a dedicated radio telegram (a so-called commissioning telegram). To do so, STM 550x can transmit a dedicated commissioning telegram identifying its relevant parameters as discussed in chapter 4.2.
  • Page 39 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR NFC interface STM 550x implements am NFC configuration interface that can be used to access (read and write) the STM 550x configuration memory and thereby configure the device as described in the following chapters.
  • Page 40 NFC SW with read, write, PIN lock, PIN unlock and PIN change functionality ◼ For PC applications, EnOcean recommends the TWN4 Multitech 2 HF NFC Reader (order code T4BT-FB2BEL2-SIMPL) from Elatec RFID Systems (sales-rfid@elatec.com). This reader is shown in Figure 24 below.
  • Page 41 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR 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, please refer to the NXP documentation which at the time of writing was available under this link: http://cache.nxp.com/documents/data_sheet/NT3H2111_2211.pdf...
  • Page 42 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR 7.4.2 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. The NFC tag exits the IDLE state towards the READY 1 state when either a REQA or a WUPA command is received from the NFC reader.
  • Page 43 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR 7.4.6 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). For example, if the specified address is 03h then pages 03h, 04h, 05h, 06h are returned. Spe- cial conditions apply if the READ command address is near the end of the accessible memory area.
  • Page 44 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR 7.4.8 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 45 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR 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. NFC memory areas These NFC pages are allocated into the following areas: Device Identification NDEF string (Public read-only access;...
  • Page 46 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR 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). An example device identification string from the NDEF area of STM 550x could be:...
  • Page 47 ◼ The 16 bit OEM field identifies the manufacturer of the device so that manufacturer- specific layout implementations can be determined. For EnOcean GmbH this field is set to 0x000B DEVICE_IDENTIFIER ◼ The 24 bit DEVICE_IDENTIFIER field identifies an individual device from the range of devices manufactured by the manufacturer specified in the OEM field.

  • Page 48: Table Of Contents

    USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR 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. the most significant byte comes first.
  • Page 49 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 50 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR 8.5.5 USER_KEY Each STM 550x 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 authenti- cate STM 550x radio telegrams when operating in high security mode.
  • Page 51 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR 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 0b00 (Default) Secure LRN Telegram (containing security key) disabled...
  • Page 52 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR 8.5.8 The EEP register determines the EnOcean Equipment Profile (EEP) used by STM 550x for the transmission of data telegrams. Figure 34 below shows the structure of the EEP regis- ter.

  • Page 53: Signal

    USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR 8.5.9 SIGNAL STM 550x supports reporting its energy status, the current energy delivery of the harvester and the backup battery status via SIGNAL telegrams as described in chapter 4.2.7. The type and the transmission rate of SIGNAL telegrams is controlled by the SIGNAL regis- ter shown in Figure 35 below.
  • Page 54 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR 8.5.10 LED_MODE The LED_MODE register determines the brightness of the LED. Figure 36 below shows the structure of the LED_MODE register. LED_MODE (Default: 0x01) Bit 7 Bit 6 Bit 5 Bit 4...
  • Page 55 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR 8.5.11 FUNCTIONAL_MODE The FUNCTIONAL_MODE register can be used to switch between the different operation modes of STM 550x as described in chapter 2.3. Figure 37 below shows the structure of the FUNCTIONAL_MODE register.
  • Page 56 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR 8.5.12 STANDARD_TX_INTERVAL STM 550x uses a standard reporting interval which can be automatically adjusted based on sensor readings as described in chapter 2.4. The standard reporting interval is set by the register STANDARD_TX_INTERVAL shown in Figure 38 below.
  • Page 57 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR 8.5.13 THRESHOLD_CFG1 STM 550x 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 2.4.
  • Page 58 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR 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) 0b00 (Default) Enabled, Reporting interval reduction if temperature below threshold...

  • Page 59: Threshold_Cfg2

    USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR 8.5.14 THRESHOLD_CFG2 STM 550x can reduce the reporting interval based on the acceleration sensor status and the magnet contact status as described in chapter 2.4. The use of these reduced reporting intervals is enabled by the THRESHOLD_CFG2 register shown in Figure 40 below.

  • Page 60: Rfu

    USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR 8.5.15 LIGHT_SENSOR_CFG STM 550x allows the user to select if the reported light level is the one measured by the ambient light sensor or the one measured by the solar cell. Refer to chapter 3.1 for a de- scription of the ambient light sensor and to chapter 3.2 for a description of the solar cell...
  • Page 61 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR 8.5.16 ACC_SENSOR_CFG The operation parameters of the acceleration sensor in STM 550x can be configured using the ACC_SENSOR_CFG registers shown in Figure 42 below. Refer to chapter 3.5 for a de- scription of the acceleration sensor function.
  • Page 62 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR 8.5.17 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 43 below.

  • Page 63: Solar_Tx_Interval

    USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR 8.5.18 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 44 below.
  • Page 64 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR 8.5.19 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 45 below.

  • Page 65: Light_Tx_Interval

    USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR 8.5.20 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 46 below.
  • Page 66 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR 8.5.21 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 51 below. Note that this threshold is also used for the wake-on-acceleration function as described in chapter 3.5.
  • Page 67 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR 8.5.22 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 52 below.
  • Page 68 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR 8.5.23 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 49 below. TEMPERATURE_THRESHOLD...
  • Page 69 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR 8.5.24 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 50 below.
  • Page 70 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR 8.5.25 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 51 below.
  • Page 71 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR 8.5.26 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 52 below.
  • Page 72 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR 8.5.27 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 52 below.
  • Page 73 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR 8.5.28 ILLUMINATION_TEST_RESULT If STM 550x has executed an illumination test as described in chapter 2.3.5 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 54 below.
  • Page 74 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR Installation recommendations Setup instructions Before installing STM 550x into its intended location, a sufficient initial charge should be provided to STM 550x and its correct operation should be verified. To do so, follow these steps: 1.
  • Page 75 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR Acceleration detection Acceleration detection enables to track the utilization of an asset (is a machine running, is a chair occupied, …) based on the characteristic vibrations associated with this utilization. Acceleration sensors – unlike gyroscopic or compass sensors – work based on changes of the acceleration vector.
  • Page 76 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR In addition to that, the following points should be considered to maximize the reliability of utilization tracking: • STM 550x should be firmly attached to the asset without any damping to ensure that any vibration of the asset will be properly propagated to STM 550x •...
  • Page 77 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR Illumination measurement STM 550x 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 8.5.15.
  • Page 78 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR Magnet contact sensing If STM 550x 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 550x magnet contact sensor for the case where a “Magnet Present”...
  • Page 79 USER MANUAL STM 550X / EMSIX – ENOCEAN MULTI-SENSOR Product history Table 40 below lists the product history of STM 550x. Revision Release Key changes versus previous revision DA-04 Mar 2020 Initial release Table 40 – Product History © 2020 EnOcean | www.enocean.com F-710-017, V1.0...

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