Page 1 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 © 2023 EnOcean | www.enocean.com F-710-017, V1.0 STM 550 User Manual | v1.7 | March 2023 | Page 1/112...
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 Sensor functionality ..................25 Light level sensor ..................25 Solar cell ....................25 Temperature sensor..................26 Humidity sensor ..................26 Acceleration sensor..................27 © 2023 EnOcean | www.enocean.com F-710-017, V1.0 STM 550 User Manual | v1.7 | March 2023 | Page 3/112...
Page 4 SECURITY_KEY_MODE ................45 9.8.7 SECURITY_MODE ................. 46 9.8.8 EEP ....................47 9.8.9 SIGNAL ....................48 9.8.10 LED_MODE ..................49 9.8.11 FUNCTIONAL_MODE ................50 © 2023 EnOcean | www.enocean.com F-710-017, V1.0 STM 550 User Manual | v1.7 | March 2023 | Page 4/112...
Page 5 12.1 European Union................... 83 12.1.1 Declaration of conformity ..............83 12.1.2 Waste treatment .................. 83 12.2 FCC (United States) ..................84 © 2023 EnOcean | www.enocean.com F-710-017, V1.0 STM 550 User Manual | v1.7 | March 2023 | Page 5/112...
Page 6 B.4.3 Secure telegram types ................111 B.4.3.1 Secure teach-in telegram ................111 B.4.3.2 Teach-in Info .................... 112 B.4.3.3 Security level format (SLF) ................. 112 © 2023 EnOcean | www.enocean.com F-710-017, V1.0 STM 550 User Manual | v1.7 | March 2023 | Page 6/112...
Page 7 STM 550 will report immediately if the status (open / closed) of the magnet contact changes or if a change in acceleration measured by the acceleration sensor exceeds a user-defined threshold for the first time.
Page 8 STM 550 modules and one box with 100 units of housing and installation material. Figure 1 below shows the STM 550 module on the left and EMSI on the right. Figure 1 – STM 550 module (left) and EMSI finished product (right) ©...
Page 9 Dimensions (EMSI finished product) 49 mm x 49 mm x 13 mm Note 1: STM 550 is designed for indoor use only and should only be used in the environmental conditions specified below Note 2: Minimum light level required for self-supplied operation with the default product configuration.
Page 10 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 10 modules per tray, 10 trays per box...
Page 11 EnOcean Alliance Security Specification. The user interface of STM 550 consists of one button for simple configuration tasks and one LED to provide user feedback. Configuration of STM 550 parameters is also possible via an integrated NFC (ISO 14443) interface.
Page 12 STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 2.2.1 Front side (STM 550) Figure 2 below shows the external interfaces on the front side of the STM 550 module. Figure 2 – STM 550 product interface (front side) 2.2.2...
Page 13 2.2.3 Back side (STM 550) Figure 4 below shows the external interfaces on the back side of the STM 550 module. The orientation indicator points towards the side where the magnet contact is located. Figure 4 – STM 550 product interface (back side) 2.2.4...
Page 14 2.3.2 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 con- serves as much energy as possible.
Page 15 STM 550 can be set into function test mode via the LRN button as described in chapter 5.2 or via the MODE field of the FUNCTIONAL_MODE NFC register as described in chapter 9.8.11.
Page 16 2.3.7 Factory reset mode STM 550 can be reset to its standard settings using factory reset mode. Upon entering this mode, STM 550 will reset all configuration registers to their default settings and then restart operation in standard operation mode.
Page 17 By default, the reporting interval is 60 seconds, i.e. STM 550 will measure and report its status approximately once per minute. STM 550 is designed to add a random timing offset of up to 10% to the configured reporting interval to increase transmission reliability and meet regulatory requirements.
Page 18 Figure 7 – Illumination-controlled reporting interval STM 550 can use either the light level at the solar cell (harvested energy) or the light level at the ambient light sensor to trigger a higher update rate. To enable this feature, use the following steps: 1.
Page 19 Figure 8 below illustrates the use of the temperature-controlled reporting interval. Figure 8 – Temperature-controlled reporting interval STM 550 can use the temperature measured by the temperature and humidity sensor to trigger a higher update rate. To enable this feature, use the following steps: 1.
Page 20 Figure 9 below illustrates the use of the humidity-controlled reporting interval. Figure 9 – Humidity-controlled reporting interval STM 550 can use the humidity measured by the temperature and humidity sensor to trigger a higher update rate. To enable this feature, use the following steps: 1.
Page 21 STANDARD_TX_INTERVAL Figure 10 – Acceleration-controlled reporting interval STM 550 can use acceleration events detected by the acceleration sensor to trigger a higher update rate. To enable this feature, use the following steps: 1. Make sure that the EEP selected using the EEP register as described in chapter 9.8.8 reports acceleration 2.
Page 22 Figure 11 below illustrates the use of the magnet contact sensor-controlled reporting interval. Figure 11 – Magnet contact sensor-controlled reporting interval STM 550 can use the status of the magnet contact to trigger a higher update rate. To enable this feature, use the following steps: 1.
Page 23 3.1.1 Light level STM 550 uses an integrated solar cell which is optimized for indoor lighting conditions. It is designed to achieve best performance for light levels between 50 lux and 2000 lux. Table 1 below provides a summary of the minimum required light level for typical work and school areas in Germany as a reference for typical light levels.
Page 24 Understanding the energy consumption is important to determine the energy balance. STM 550 is designed to operate for one full day (24 hours) based on 200 lux of ambient light available for 6 hours. This means that 6 hours of available light will provide enough energy for 24 hours (6 hours with light, 18 hours without light) of operation.
Page 25 Figure 12 – Spectrum response of the light level sensor Solar cell STM 550 can use SIGNAL telegrams - as described in chapter A.5.2.5 - to report the energy generated by the solar cell. Reporting of the solar cell energy generation level can be enabled and disabled via the SIGNAL register of the NFC interface as described in chapter 9.8.9.
Page 26 +-0.3 °C throughout the entire operation temperature range and an accuracy of better than +-0.2 °C for the typical indoor temperature range. Figure 13 below shows the typical accuracy of the STM 550 temperature sensor as a function of the ambient temperature. Figure 13 – 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.
Page 27 (acceleration vector changes). Examples use cases causing such small vibrations include asset utilization (e.g. a motor to which STM 550 is attached is run- ning) or asset movement (e.g. an asset to which STM 550 is attached changes its location).
Page 28 Table 2 – Acceleration sensor parameters Note that increasing the sampling rate will proportionally increase the power con- sumption of STM 550. The sampling rate should only be increased if sufficient ambi- ent light is available or if a backup battery is used.
Page 29 Refer to Chapter 2.2 for the location of the magnet contact sensor within STM 550 and to Chapter 11.7 for mounting instructions. The STM 550 installation kit includes a block magnet suitable for use with its magnet contact sensor. Figure 16 shows the outer appearance of this magnet.
Page 30 STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS User interface The STM 550 product interface contains an LED, a LRN button and a backup battery interface as described in chapter 2.2. STM 550 contains an indication LED used to provide user feedback. By default, the LED will blink shortly whenever a telegram is transmitted.
Page 31 STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS Backup battery STM 550 provides a backup battery interface to mount a CR1632 battery for cases with insufficient ambient light. The backup battery has to be installed with the negative pole point- ing upwards (i.e.
Page 32 Each STM 550 module contains a product label with a commissioning QR code. Figure 18 shows the STM 550 product label. STM 550U and STM 550J use the same label structure. Note the commissioning QR code (described in chapter 8.2) on the bottom left side.
Page 33 ERP2 (ISO 14543-3-11) standard. Refer to Appendix A for a description of EnOcean Radio Protocol and EnOcean Equipment Profiles. Supported EEP STM 550 supports a wide range of EEP suitable for different use cases. Table 5 below lists the supported EEP. For details about the data format used by these EEP, see: http://tools.enocean-alliance.org/EEPViewer/#1...
Page 34 6.1.1 Default EEP The default EEP used by STM 550 is D2-14-41 (VLD with 9 byte payload). It is possible to select another one of the supported EEP via the EEP register of the NFC configuration interface described in chapter 9.8.8.
Page 35 For backwards compatibility with legacy systems, it is possible to select via NFC a legacy mode using a 3 byte sequence counter to generate a 3 byte signature. STM 550 will use secure chained telegrams (SEC_CDM) if high security mode is used and the telegram payload (including rolling code and CMAC) exceeds 14 byte.
Page 36 The following two tasks are required in this process: Device identification ◼ The receiver needs to know how to uniquely identify this specific STM 550 device. This is achieved by using a unique 48 Bit ID (Source Address) for each STM 550 de- vice. Security parameter exchange ◼...
Page 37 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. Transmission of the teach-in telegram is triggered by pressing the LRN button or via the NFC interface by setting the function mode to Learn Mode as described in chapter 9.8.11.
Page 38 NFC interface parameters The NFC interface of STM 550 uses NFC Forum Type 2 Tag functionality as specified in the ISO/IEC 14443 Part 2 and 3 standards. It is implemented using an NXP NT3H2111 Mifare Ultralight tag.
Page 39 NFC functionality is available in certain Android (e.g. Samsung Galaxy S7 or newer) and iOS (iPhone7 or newer, firmware version 13 or newer) smartphones. EnOcean provides the configuration app “EnOcean Tool” for these devices which can be downloaded directly from the respective app store.
Page 40 STM 550 does not use this area and does not interpret its content in any way. The organization of the STM 550 NFC memory map is shown in Table 8 below.
Page 41 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 550 could be: 6PENO+30S000012345678+1P000B0000004C+30PS6221-K516+2PDB06+12Z01234567891234 +3C31+01000000 This NDEF string encodes the parameters shown in Table 9 below.
Page 42 LENGTH ◼ This field identifies the length of the NFC header. For STM 550, this field is set to 0x0A since the header structure is 10 bytes long VERSION ◼ This field identifies the major revision and is set to 0x01 currently ◼...
Page 43 Before making any changes to the default configuration, be sure to familiarize yourself with the functionality of the device and the effect of the intended changes. STM 550 will not ac- cept the setting of non-valid values for its parameters. If any parameter is non-valid then all changes made will be rejected and the previous configuration will be restored.
Page 44 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 45 The register SECURITY_KEY_MODE allows selecting if FACTORY_KEY or USER_KEY should be used to encrypt and authenticate STM 550 radio telegrams in high security mode. In ad- dition, it allows disabling the transmission of Secure Teach-in telegrams in order to protect- ing the security key.
Page 46 0b10, 0b11 Table 11 – SECURE LRN TELEGRAM bit field encoding 9.8.7 SECURITY_MODE The register SECURITY_MODE identifies the security settings used by STM 550. Figure 24 below shows the structure of the SECURITY_MODE register. SECURITY_MODE (Default: 0x00) Bit 7 Bit 6...
Page 47 STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 9.8.8 The EEP register determines the EnOcean Equipment Profile (EEP) used by STM 550 for the transmission of data telegrams. Figure 25 below shows the structure of the EEP register.
Page 48 (MID 0x0D) and backup battery status (MID 0x10) is disabled. STM 550 allows additionally to configure at what rate each enabled SIGNAL telegram will be sent using the TRANSMISSION RATE bit field as shown in Table 15 below. If more than one SIGNAL telegram is enabled, then this rate will apply to all enabled telegrams.
Page 49 LED is disabled 0b00 LED is enabled 0b01 (Default) Reserved (Do not use) 0b10, 0b11 Table 16 – LED bit field encoding © 2023 EnOcean | www.enocean.com F-710-017, V1.0 STM 550 User Manual | v1.7 | March 2023 | Page 49/112...
Page 50 Note that the default configuration (after factory reset) is standard operation mode while the out of box configuration (for new devices) is standby (sleep) mode. © 2023 EnOcean | www.enocean.com F-710-017, V1.0 STM 550 User Manual | v1.7 | March 2023 | Page 50/112...
Page 51 STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 9.8.12 STANDARD_TX_INTERVAL STM 550 uses a standard reporting interval which can be automatically adjusted based on sensor readings as described in chapter 2.4. The standard reporting interval is set by the register STANDARD_TX_INTERVAL shown in Figure 29 below.
Page 52 STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 9.8.13 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 2.4.
Page 53 Enabled, Reporting interval reduction if humidity above threshold 0b10 Reserved (Do not use) 0b11 Table 22 – HUMIDITY SENSOR bit field encoding © 2023 EnOcean | www.enocean.com F-710-017, V1.0 STM 550 User Manual | v1.7 | March 2023 | Page 53/112...
Page 54 STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 9.8.14 THRESHOLD_CFG2 STM 550 can reduce the reporting interval based on the acceleration sensor status and the magnet contact status as described in chapter 2.4. The use of these reduced reporting intervals is enabled by the THRESHOLD_CFG2 register shown in Figure 31 below.
Page 55 9.8.15 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 4.1 for a descrip- tion of the ambient light sensor and to chapter 4.2 for a description of the solar cell func- tionality.
Page 56 STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 9.8.16 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 33 below. Refer to chapter 4.5 for a de- scription of the acceleration sensor function.
Page 57 The default setting for the solar cell threshold is 200 lux which corresponds to good availa- bility of ambient light for harvesting. © 2023 EnOcean | www.enocean.com F-710-017, V1.0 STM 550 User Manual | v1.7 | March 2023 | Page 57/112...
Page 58 The default reporting interval while solar cell illumination is above the solar cell illumination threshold is 60 seconds. This can be reduced according to user requirements keeping in mind the energy balance. © 2023 EnOcean | www.enocean.com F-710-017, V1.0 STM 550 User Manual | v1.7 | March 2023 | Page 58/112...
Page 59 0xFFFF Table 31 – LIGHT SENSOR THRESHOLD bit field encoding The default setting for the light sensor threshold is 200 lux. © 2023 EnOcean | www.enocean.com F-710-017, V1.0 STM 550 User Manual | v1.7 | March 2023 | Page 59/112...
Page 60 60 seconds. This can be reduced according to user re- quirements keeping in mind the energy balance. © 2023 EnOcean | www.enocean.com F-710-017, V1.0 STM 550 User Manual | v1.7 | March 2023 | Page 60/112...
Page 61 2/64 * Full scale … 0b111110 62/64 * Full scale 0b111111 63/64 * Full scale Table 33 – ACCELERATION THRESHOLD bit field encoding © 2023 EnOcean | www.enocean.com F-710-017, V1.0 STM 550 User Manual | v1.7 | March 2023 | Page 61/112...
Page 62 The default reporting interval when the acceleration meets the defined threshold criteria is 60 seconds. This can be reduced according to user requirements keeping in mind the en- ergy balance. © 2023 EnOcean | www.enocean.com F-710-017, V1.0 STM 550 User Manual | v1.7 | March 2023 | Page 62/112...
Page 63 0x0000 0.0°C 0x0001 0.1°C … 65.0°C 0x028A Reserved 0xFF38 -20.0°C … 0xFFFF -0.1°C Table 35 – TEMPERATURE THRESHOLD bit field encoding © 2023 EnOcean | www.enocean.com F-710-017, V1.0 STM 550 User Manual | v1.7 | March 2023 | Page 63/112...
Page 64 The default reporting interval when the temperature meets the defined threshold criteria is 60 seconds. This can be reduced according to user requirements keeping in mind the en- ergy balance. © 2023 EnOcean | www.enocean.com F-710-017, V1.0 STM 550 User Manual | v1.7 | March 2023 | Page 64/112...
Page 65 0.5 % r.h. … 99.5 %r.h. 0x00C7 0x00C8 100.0 %r.h. Others Reserved (Do not use) Table 37 – HUMIDITY THRESHOLD bit field encoding © 2023 EnOcean | www.enocean.com F-710-017, V1.0 STM 550 User Manual | v1.7 | March 2023 | Page 65/112...
Page 66 The default reporting interval when the humidity meets the defined threshold criteria is 60 seconds. This can be reduced according to user requirements keeping in mind the energy balance. © 2023 EnOcean | www.enocean.com F-710-017, V1.0 STM 550 User Manual | v1.7 | March 2023 | Page 66/112...
Page 67 The default reporting interval when the magnet contact state meets the defined state is 60 seconds. This can be reduced according to user requirements keeping in mind the energy balance. © 2023 EnOcean | www.enocean.com F-710-017, V1.0 STM 550 User Manual | v1.7 | March 2023 | Page 67/112...
Page 68 9.8.28 ILLUMINATION_TEST_RESULT If STM 550 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 45 below.
Page 69 10.1.1 Top view Figure 46 below shows the STM 550 module seen from the top. The cut view along the A-A line is shown in chapter 10.1.3. Figure 46 – Top view of STM 550 module © 2023 EnOcean | www.enocean.com F-710-017, V1.0...
Page 70 STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 10.1.2 Bottom view Figure 47 below shows the STM 550 module seen from the bottom. Figure 47 – Bottom view of STM 550 module © 2023 EnOcean | www.enocean.com F-710-017, V1.0...
Page 71 Figure 48 – Cut view (A-A) of STM 550 module 10.1.4 Front view Figure 49 below shows the STM 550 module seen from the front. Figure 49 – Front view of STM 550 module © 2023 EnOcean | www.enocean.com F-710-017, V1.0...
Page 72 STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 10.1.5 Side view Figure 50 below shows the STM 550 module seen from the side. Figure 50 – Side view of STM 550 module © 2023 EnOcean | www.enocean.com F-710-017, V1.0...
Page 73 STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 10.2 Housing The STM 550 installation kit provides a housing for integration of the STM 550 module. Figure 51 below shows the mechanical interface of this housing. Figure 51 – Mechanical interface of STM 550 in housing The housing can be attached to a variety of surfaces using the provided adhesive pad.
Page 74 STM 550 and its correct operation should be verified. To do so, follow these steps: 1. Place STM 550 under bright light (daylight or bright light source) for 5 minutes to provide an initial charge 2. Press the LRN button once so that STM 550 will start operation 3.
Page 75 STM 550 should not be used on fast moving or strongly vibrating parts. ◼ If used as a door sensor, STM 550 should be attached to the stationary door frame Additional, application-specific guidance (for specific use cases) is provided in subsequent chapters.
Page 76 Avoid mounting the sensor in niches or slots with little air flow. When designing your own housing around an STM 550 module, consider the location of the ventilation slots (there are four of them in total) as shown in Figure 54.
Page 77 Figure 55 below. This illustration assumes that STM 550 is placed flat onto a surface parallel to the earth surface (e.g. a table). Figure 55 – Acceleration vector based on device orientation Note that it is not possible to distinguish cases where STM 550 is rotated but its orientation relative to the direction of earth gravity remains the same.
Page 78 STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS Figure 57 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 ◼ is attached to the window part that is tilted since the orientation of STM 550 relative...
Page 79 In both cases, STM 550 should be attached to the object for which location or utilization shall be monitored. The following chapter gives general guidelines how to do so.
Page 80 11.6 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 9.8.15. By default, the ambient light sensor is used.
Page 81 STM 550 is designed to operate self-supplied with its standard parameters based on 200 lux of illumination at its solar cell for at least 6 hours per day. STM 550 can operate for 4 days without available energy after being exposed to 200 lux for 2 days.
Page 82 Updating the device configuration via the NFC interface requires that STM 550 has sufficient energy to read and process the new parameters. It is therefore recom- mended to provide an initial charge to STM 550 by placing it under bright light for 5 minutes before starting the configuration process.
Page 83 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 84 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 12.2 FCC (United States) 12.2.1 FCC Grant Of Equipment Authorization © 2023 EnOcean | www.enocean.com F-710-017, V1.0 STM 550 User Manual | v1.7 | March 2023 | Page 84/112...
Page 85 STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 12.2.2 FCC OEM requirements In order to use EnOcean’s FCC ID number, OEM integrating STM 550U into own products must ensure that the following conditions are met: The Original Equipment Manufacturer (OEM) must ensure that FCC labeling require- ◼...
Page 86 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 12.3 ISED (Industry Canada) 12.3.1 ISED Technical Acceptance Certificate © 2023 EnOcean | www.enocean.com F-710-017, V1.0 STM 550 User Manual | v1.7 | March 2023 | Page 86/112...
Page 87 (1) l'appareil ne doit pas produire de brouillage, et (2) l'utilisateur de l'appareil doit accepter tout brouillage radioélectrique subi, même si le brouillage est susceptible d'en compromettre le fonctionnement.” © 2023 EnOcean | www.enocean.com F-710-017, V1.0 STM 550 User Manual | v1.7 | March 2023 | Page 87/112...
Page 88 USER MANUAL STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS 12.4 ARIB (Japan) 12.4.1 ARIB construction type conformity certificate © 2023 EnOcean | www.enocean.com F-710-017, V1.0 STM 550 User Manual | v1.7 | March 2023 | Page 88/112...
Page 89 - Corrected issues with EEP support and backup battery STM 550U DA-05 May 2021 Market Release (902.875 MHz) Table 40 – Product History © 2023 EnOcean | www.enocean.com F-710-017, V1.0 STM 550 User Manual | v1.7 | March 2023 | Page 89/112...
Page 90 STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS A. Introduction to EnOcean radio protocol This chapter gives a high-level introduction to key aspects of the EnOcean radio protocol to help the understanding of STM 550 radio transmission features. Refer to the EnOcean Radio Protocol 1 (ERP1) specification and the EnOcean Radio Protocol 2 (ERP2) specification for detailed information.
Page 91 CRC is used to verify the integrity of the telegram ◼ A.3 Subtelegrams EnOcean radio systems use the concept of redundant subtelegrams in order to increase the communication reliability. In addition to using redundant transmissions, first and second level repeaters can be used to increase communication distance.
Page 92 A.3.1 Subtelegram timing EnOcean Radio Protocol 1 (ERP1) and EnOcean Radio Protocol 2 (ERP2) uses a repeater-level dependent time slot mechanism for the subtelegram timing during transmission. The sender of a radio telegram will transmit the first telegram immediately upon receiving the request for transmission.
Page 93 Identical subtelegrams from the same sender are considered to belong to the same telegram if they are received within the RX maturity time. In EnOcean radio systems, the RX maturity time is 100 ms. © 2023 EnOcean | www.enocean.com F-710-017, V1.0 STM 550 User Manual | v1.7 | March 2023 | Page 93/112...
Page 94 Telegrams where the intended receiver is designated are called Addressed Data Tele- gram or ADT in short. Telegrams where the intended receiver is not designated are called Broadcast Telegrams. Different types of addresses can be used to designate sender and receiver of an EnOcean radio telegram. A.4.1...
Page 95 Base ID within a system might lead to undefined system behaviour. Note also that the use of Base ID is not defined within the scope of secure communication, remote management or smart acknowledge. STM 550 does not support the use of Base ID. © 2023 EnOcean | www.enocean.com F-710-017, V1.0...
Page 96 STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS A.5 Data payload EnOcean radio systems encode the data using so called EEP (EnOcean Equipment Profile). Each transmitter might choose one (or sometimes several) EEP for data transmission de- pending on the type of transmitted data.
Page 97 STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS A.5.2 Common RORG Within EnOcean radio telegrams, the RORG field identifies the telegram type as described in the previous chapter. Table 43 below lists common RORG used for communication in EnOcean systems.
Page 98 BYTE0 BYTE0 BYTE1 BYTE2 BYTE3 BYTE4 BYTE5 BYTE5 0xD4 CTRL CHANNEL MANUFACTURER_ID FUNC TYPE RORG Figure 64 – UTE Telegram Structure © 2023 EnOcean | www.enocean.com F-710-017, V1.0 STM 550 User Manual | v1.7 | March 2023 | Page 98/112...
Page 99 SIGNAL type. Figure 65 below shows the structure of a SIGNAL telegram. Figure 65 – SIGNAL Telegram Structure © 2023 EnOcean | www.enocean.com F-710-017, V1.0 STM 550 User Manual | v1.7 | March 2023 | Page 99/112...
Page 100 A.5.3 Data payload size The maximum telegram data payload size used by EnOcean radio telegrams is 14 byte of data payload for the case of standard broadcast telegrams. For the case of standard ad- dressed telegrams, the maximum length of the data payload is 9 byte.
Page 101 Figure 68 below shows the structure for the first telegram in a chain of addressed telegrams. Figure 68 – Structure of the first telegram in a chain of addressed telegrams © 2023 EnOcean | www.enocean.com F-710-017, V1.0 STM 550 User Manual | v1.7 | March 2023 | Page 101/112...
Page 102 (if the data exactly fits into the previous telegram in the chain). Figure 72 – Structure of the last telegram in a chain of secure telegrams © 2023 EnOcean | www.enocean.com F-710-017, V1.0 STM 550 User Manual | v1.7 | March 2023 | Page 102/112...
Page 103 The last SEC_CDM telegram might therefore be split into two ad- dressed SEC_CDM telegrams due to the addition of the RORG and DESTINATION EURID ad- dressing fields resulting in a telegram size larger than the maximum size of EnOcean radio telegrams.
Page 104 This chapter gives a high-level introduction to key aspects of the security protocol used in EnOcean radio networks to help the understanding of security-related features of STM 550. Refer to the EnOcean Alliance Security Specification for a detailed up to date description of all features.
Page 105 If different security keys are used for encryption at the sender and decryption at the receiver then this is called an asymmetric key algorithm or a public key algorithm. Public / private key algorithms such as PGP, GPG or TLS fall into this category. EnOcean radio systems do not support asymmetric key algorithms.
Page 106 Figure 77 below illustrates the concept of telegram authorization via a telegram signature. Figure 77 – Telegram authentication via telegram signature © 2023 EnOcean | www.enocean.com F-710-017, V1.0 STM 550 User Manual | v1.7 | March 2023 | Page 106/112...
Page 107 RLC. Figure 78 shows the concept of adding an RLC to the telegram data. Figure 78 – Addition of an RLC to the telegram data © 2023 EnOcean | www.enocean.com F-710-017, V1.0 STM 550 User Manual | v1.7 | March 2023 | Page 107/112...
Page 108 STM 550 / EMSI – ENOCEAN MULTISENSOR FOR IOT APPLICATIONS EnOcean radio systems use an approach where the RLC is used to change the security ma- terial (specifically, the initialization vector – often called Nonce - used by the security algo- rithms together with the security key) to ensure that the encrypted telegram payload and the telegram signature change even when the content of the telegram itself stays the same.
Page 109 RLC2 and Key2 together with the address of Device1 in its outbound secure link table. Figure 80 below illustrates that. Figure 80 – Security key and RLC usage in bi-directional communication © 2023 EnOcean | www.enocean.com F-710-017, V1.0 STM 550 User Manual | v1.7 | March 2023 | Page 109/112...
Page 110 RLC is found within the rolling code window, then the message cannot be de- crypted and authenticated and might be forwarded to the host for further analysis. © 2023 EnOcean | www.enocean.com F-710-017, V1.0 STM 550 User Manual | v1.7 | March 2023 | Page 110/112...
Page 111 The 128 bit security key is used by the sender to encrypt and authenticate the trans- mitted telegram and by the receiver to decrypt and authenticate the received telegram © 2023 EnOcean | www.enocean.com F-710-017, V1.0 STM 550 User Manual | v1.7 | March 2023 | Page 111/112...
Page 112 Others: RFU 0b110: 32 bit RLC (24 bit transmitted) 0b111: 32 bit RLC (32 bit transmitted) Figure 83 – SLF structure © 2023 EnOcean | www.enocean.com F-710-017, V1.0 STM 550 User Manual | v1.7 | March 2023 | Page 112/112...

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