Wireless M-Bus Range Extender with LoRa technology

Wireless M-Bus Range Extender with LoRa technology

Wireless M-Bus Range Extender with LoRa technology

No more time-consuming on-site visits to read out consumption data. This device acts as a bridge between WM-Bus and LoRaWAN® networks and allows an efficient management of wireless M-Bus meter data remotely, even if they are installed in inaccessible locations.
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Wireless M-Bus Range Extender with LoRa technology
Wireless M-Bus and LoRaWAN Certified Logos

Key Features

  • IP65 / IP67 housing
  • Long range with LoRa® (>10 km LoS)
  • Compatible with OMS devices
  • WM-Bus S1 and combined C1/T1 Mode supported
  • Duplicate packet filtering
  • 32 Calender events and 32 WM-Bus device filters
  • EU868 LoRaWAN® compliant
  • Ultra low power for long battery life
  • Flexible configuration OTA via LoRa® or cable
  • Automated Meter Reading
  • IMST Decoder for Wireless M-Bus Range Extender This section converts the uploaded data of the Wireless M-Bus Range Extender received by a LoRaWAN® server in a human readable format.
    ➤ Details about the Transport Protocol can be found here or within download section for technical documents
    Upload of Application Data

    The upload of application data like captured Wireless M-Bus packets is implemented by means of confirmed LoRaWAN® uplink packets. Due to the adaptive payload capacity of LoRaWAN® packets a complete Wireless M-Bus packet may require more than one LoRaWAN® uplink packets. In this case a simple segmentation protocol with minimal overhead of one single byte is used. The protocol supports both, spreading of WM-Bus packets over multiple LoRaWAN® packets and transmitting of multiple WM-Bus packets in a single LoRaWAN® packet.

    Application Data Upload

    Transport Protocol Details

    The transport protocol is used in uplink- and downlink direction on several LoRaWAN® ports which indicate the type of message content. The protocol uses a single octet header field with following format:

    Transport Protocol Header

    • Last Segment Indicator (Bit 7)
      This bit indicates the last segment of a transmission if set to "1".
    • Segment Number (Bit 0 .. 6)
      The segment number starts at zero for every new transmission and will be incremented by "1" for every new segment. On receiver side it might happen that duplicated segment numbers will appear. In this case the receiver should simply ignore the duplicate segments. The segment number can wrap around from 127 to 0 in case of very large transmissions and tiny segments.

    ➤ Instructions & Hints
    Instructions:
    • - select corresponding port
    • - add received payload by using 'add a received payload sequence' button for every single packet
    • - by double clicking on a decoded data block (table), an AES decryption key can be entered

    Hints:
    • - entered data must be in hex and in one of the following formats:
      • - 123456
      • - 12 34 56
      • - 0x12 0x34 0x56
      • - 12-34-56
      • - 0x123456
    • - you can add as much sequences as you want by pressing the "add a received payload sequence" button
    • - not segmented payloads are interpreted after they have been added
    • - segmented payloads are reassembled and interpreted, if the beginning of a sequence (Segment Number == 0) and the Last Segment Indicator according to the Transport Protocol Details are detected
    • - for changing the port, you have to clear already added payload first
    • - encryption modes 0 and 5 are supported
    Port Selection






    Note:

    If the buttons are not working, please clear your browser cache.

    Entered Data Entered Payloads
    Entered AES Decryption Keys
    Decoded Data

  • The Wireless M-Bus standard (EN 13757-4) is used in many wireless sensor and smart meter applications. These meters and sensors are communicating according to defined radio operation modes based on a standard FSK modulation with more or less range to the corresponding receiving unit.

    The LoRa® modulation is a perfect mean to increase the range of wireless communication systems. The Wireless M-Bus Range Extender combines the two existing modulation technics and required communication protocol stacks in one single device.

    A typical usecase for this product is the forwarding of WM-Bus messages of a configurable group of sensor / meter devices. This bridge offers a flexible way to define hourly, daily, weekly or monthly reception windows for sampling of WM-Bus messages and a large data memory for temporary buffering. Even large WM-Bus messages with maximum payload size can be forwarded with small LoRaWAN® radio packets by means of an integrated segmentation and reassembly protocol.

    Besides LoRaWAN® a proprietary Point-to-Point and Point-to-Multipoint protocol (LR Base) can be selected for local configuration and message forwarding.*

    * on request

  • >> Scroll table horizontally

    Frequency rangeSRD Band 863 to 870 MHz
    ModulationLoRa® Spread-Spectrum FSK Wireless M-Bus standard (EN 13757-4)
    WM-Bus ModesWM-Bus S1 and combined C1/T1 Mode supported
    Max.Output Power+14 dBm
    Data Memory8 MBit Flash
    Dimensions145 x 92 x 55 mm
    Operating temperature-10 °C to +55 °C
    AntennaIntegrated antenna or external antenna (on request)
    HousingHousing for wall mounting

FAQ

  • The maximum number of devices a gateway can collect data from depends on several factors. Based on the internal memory capacity of 1 MB, the gateway can handle approximately 10,000 Wireless M-Bus devices, assuming each device sends a 100-byte telegram that is received and forwarded via LoRa. Wireless M-Bus communication (from the meter to our device) typically achieves transmission distances of tens of meters. This range depends on several factors, such as the installation location of the meters (e.g., in a building basement or in a cabinet).

  • The Wireless M-Bus Range Extender is a compact and cost-effective device that acts as a bridge between Wireless M-Bus (wM-Bus) meters and a LoRaWAN® network. Its main function is to collect wireless M-Bus messages from meters and forward them to a LoRaWAN® network. By utilising LoRa® modulation, which is known for its long range, the extender can significantly extend the communication range of Wireless M-Bus meters. This enables efficient remote management of meter data, even in hard-to-reach locations, and eliminates the need for time-consuming on-site readings.

  • The range extender supports the Wireless M-Bus standard (EN 13757-4) in operating modes S and combined C/T. It can process WM-Bus telegram formats A and B. It uses LoRaWAN® for the forwarding function and is EU868 LoRaWAN®-compliant.

  • The Wireless M-Bus Range Extender can be configured in two main ways:

    • Using a PC tool via a serial interface: This is the recommended method for initial configuration. With the free ‘WS Configurator’ tool, the device can be connected to a PC/laptop via a serial cable. Here, LoRaWAN® settings, calendar events, WM bus filters and the system time can be set up.
    • Over-The-Air (OTA) via LoRaWAN®: Certain parameters such as calendar events and packet filters can also be updated OTA via LoRa® messages. This allows remote management of device settings after installation.

    The extender offers 32 calendar events and 32 WM bus device filters that are freely configurable to control reception intervals and the selection of specific measuring devices.

  • The range extender is designed for extremely low power consumption to ensure long battery life. It has an automatic power-saving mode with a quiescent current of <= 3µA (when idle). The typical current consumption in transmit mode is 35mA and in receive mode 13mA (20mA during active packet reception). The device comes standard with a non-rechargeable 3.6V lithium thionyl chloride (Li-SOCl2) battery cell with a capacity of 19Ah. To optimise battery life, the extender allows specific reception windows to be defined (hourly, daily, weekly, monthly) and uses intelligent filtering of WM bus packets to store and upload only relevant data. Battery status is monitored by measuring the voltage before status reports.

  • The range extender collects wireless M-Bus messages from meters. To maximise efficiency and reduce power consumption, it implements various filter mechanisms:

    • Manufacturer ID (M field) and transmitter address (A field/device ID): Messages can be filtered according to specific device groups. Up to 32 WM-Bus address filter entries can be defined based on fields such as manufacturer ID, device ID, version and type.
    • Filter group ID: Multiple filters can be combined into a group, which is then assigned to a calendar event. A special value (255) means that all configured filters are applied.
    • Duplicate filter: An integrated function filters duplicate packets to avoid redundancy. This filter is initialised at the start of each reception window and is limited to a maximum of 64 entries, comparing WM-Bus packet header fields and optionally a 16-bit CRC. Accepted packets are cached in the internal 8 Mbit flash memory and automatically deleted after a LoRaWAN® upload session.

  • Application data, such as the recorded Wireless M-Bus packets, is uploaded using ‘confirmed’ or ‘unconfirmed’ LoRaWAN® uplink packets. Since the maximum payload size of a LoRaWAN® packet depends on the data rate used and can vary (Adaptive Data Rate, ADR), it may be necessary to split a complete Wireless M-Bus packet into several LoRaWAN® uplink packets. A simple segmentation protocol with minimal overhead of a single byte is used for this purpose. This protocol enables both the division of large WM-Bus packets into several LoRaWAN® packets and the transmission of several small WM-Bus packets in a single LoRaWAN® packet. The LoRaWAN® port identifies the message type and the protocol used (segmented or unsegmented).

Contact us today to discuss your needs Use the strengths of the IoT with IMST GmbH. Get in touch

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