Wireless M‑Bus (wM‑Bus) to NB‑IoT

The Wireless M-Bus (wM-Bus) to the NB-IoT Converter enables the collection and transmission of the data from existing meters using the open wM-Bus standard as well as the selected proprietary protocols.

The converter is particularly useful for property management companies and water utilities that need to connect their existing meters to comply with the European EED directive without the need to replace the meters themselves.

How Does it Work?
NB-IoT connectivity – today, the  Narrowband IoT coverage is available almost everywhere, with a reach even in hard-to-access areas. Additionally, SIM cards can be obtained for as little as 1 EUR per year.
The antenna connector for the wM-Bus reception is designed to minimize losses, ensuring the highest possible reception sensitivity. As a result, we can cover up to 6 floors, depending on the type of building.
The internal NB-IoT antenna provides sufficient coverage and eliminates the need for two external antennas, preventing the possibility of them being swapped during the installation.
Thanks to the standard SMA connector, you can use a cable to extend the antenna from the hard-to-reach places.
A big battery designed  to last over 10 years with the daily readings from Monday to Friday.
Waterproof casing (IP67) for the outdoor installations – for example, even on the street lighting in the middle of a housing estate.
During the manufacturing, we insert your SIM card, connect the battery and upload your configuration. This way, you don't need to spend extra time on the device and it can go directly to the installation.
Screws that won't fall out of the cover during installation make the assembly easier and ensure that the IP rating of the converter is not compromised.
How Does it Work?
NB-IoT connectivity – now offers coverage almost everywhere, reaching even into basements and SIM cards can be obtained for as little as 1 EUR per year.
The antenna connector is designed to minimize losses, ensuring the highest possible reception sensitivity. This allows you to use the device inside a heat exchange station while still maintaining a strong signal.
WAGO connector – the industry-standard terminal block for a quick and secure connections. It shortens the installation time and helps to eliminate mistakes caused by the insufficient wire tightening in the terminal block.
Thanks to the standard SMA connector, you can use a cable to extend the antenna from the hard-to-reach places.
For the installations without an electrical power supply, the converter is available in a battery-powered version, ensuring a long battery life even with the frequent data readings.
IP67 waterproof enclosure for the outdoor installations – ideal for the mounting on the wall of a heat exchange station.
Support for up to 16 connected devices, providing maximum installation flexibility and ensuring that you won't need to return for a second device if there's one more meter than expected.
Screws that won't fall out of the cover during installation make the assembly easier and ensure that the IP rating of the converter is not compromised.
The converter, with a support for the M-Bus standard, is compatible with various meters from different manufacturers, ensuring the versatility and the easy integration.
Data filtering at the hardware level using the VIF and the DIF values for the efficient shortening of the M-Bus message. The message remains standardized and can be processed by any M-Bus parser.
For the demanding applications, a version with an external power is available, providing the continuous power supply to the M-Bus.
How Does it Work?
Data filtering at the hardware level using the VIF and the DIF values for efficient shortening of the M-Bus message. The message remains standardized and can be processed by any M-Bus parser.
The antenna connector is designed to minimize losses, ensuring the highest possible reception sensitivity. This allows you to use the device inside a heat exchange station while still maintaining a strong signal.
WAGO connector – the industry-standard terminal block for a quick and secure connections. It shortens the installation time and helps to eliminate mistakes caused by the insufficient wire tightening in the terminal block.
Thanks to the standard SMA connector, you can use a cable to extend the antenna from the hard-to-reach places.
Communication tested within the largest LoRaWAN networks in Europe as well as in the isolated systems.
For the installations without an electrical power supply, the converter is available in a battery-powered version, ensuring a long battery life even with the frequent data readings.
IP67 waterproof enclosure for the outdoor installations – ideal for the mounting on the wall of a heat exchange station.
Support for up to 16 connected devices, providing maximum installation flexibility and ensuring that you won't need to return for a second device if there's one more meter than expected.
Screws that won't fall out of the cover during installation make the assembly easier and ensure that the IP rating of the converter is not compromised.
The converter, with a support for the M-Bus standard, is compatible with various meters from different manufacturers, ensuring the versatility and the easy integration.
For the demanding applications, a version with an external power supply is available, that enables the continuous M-Bus power supply.
How Does it Work?
The antenna connector is designed to minimize losses, ensuring the highest possible reception sensitivity. This allows you to use the device inside a heat exchange station while still maintaining a strong signal.
WAGO connector – the industry-standard terminal block for a quick and secure connections. It shortens the installation time and helps to eliminate mistakes caused by the insufficient wire tightening in the terminal block.
Thanks to the standard SMA connector, you can use a cable to extend the antenna from the hard-to-reach places.
Communication tested within the largest LoRaWAN networks in Europe as well as in the isolated systems.
For the installations without an electrical power supply, the converter is available in a battery-powered version, ensuring a long battery life even with the frequent data readings.
IP67 waterproof enclosure for the outdoor installations – ideal for the mounting on the wall of a heat exchange station.
The converter is compatible with  various protocols, including Modbus RTU, Modbus ASCII, IEC 62052 and DLMS.
Screws that won't fall out of the cover during installation make the assembly easier and ensure that the IP rating of the converter is not compromised.
Support for up to 128 connected devices, providing the maximum flexibility during the installation and ensuring that you won’t need to return for a second device if there's one more meter than expected.
For the demanding applications, a version with an external power supply is available, allowing the continuous power supply to the sensors.
How Does it Work?
The antenna connector is designed to minimize losses, ensuring the highest possible reception sensitivity. This allows you to use the device inside a heat exchange station while still maintaining a strong signal.
WAGO connector – the industry-standard terminal block for a quick and secure connections. It shortens the installation time and helps to eliminate mistakes caused by the insufficient wire tightening in the terminal block.
Thanks to the standard SMA connector, you can use a cable to extend the antenna from the hard-to-reach places.
NB-IoT connectivity – now offers coverage almost everywhere, including the underground levels and SIM cards can be obtained for as little as 1 EUR per year.
For the installations without an electrical power supply, the converter is available in a battery-powered version, ensuring a long battery life even with the frequent data readings.
IP67 waterproof enclosure for the outdoor installations – ideal for the mounting on the wall of a heat exchange station.
The converter is compatible with  various protocols, including Modbus RTU, Modbus ASCII, IEC 62052 and DLMS.
Screws that won't fall out of the cover during installation make the assembly easier and ensure that the IP rating of the converter is not compromised.
Support for up to 128 connected devices, providing the maximum flexibility during the installation and ensuring that you won’t need to return for a second device if there's one more meter than expected.
For the demanding applications, a version with an external power is available, allowing the continuous power supply to the external sensors.
How Does it Work?
The antenna connector is designed to minimize losses, ensuring the highest possible reception sensitivity. This allows you to use the device inside a heat exchange station while still maintaining a strong signal.
Support for up to 4 connected devices, providing the maximum flexibility during the installation. This ensures that you won’t need to return for an additional device if there’s one more meter than expected during the installation.
Thanks to the standard SMA connector, you can use a cable to extend the antenna from the hard-to-reach places.
Communication tested within the largest LoRaWAN networks in Europe as well as in the isolated systems.
Two-piece EUROCLAMP connector – an industry-standard two-piece terminal block for  quick and secure connections. The advantage of the two-piece terminal block is the ability to prepare the meter connections in advance and then simply attach the terminal block to the PCB.
A big battery with a lifespan of over 10 years, considering the frequency of readings.
IP67 waterproof enclosure for the outdoor installations – ideal for the mounting on the wall of a heat exchange station.
The converter, with its wide input tolerance, is compatible with various meters from different manufacturers, ensuring the versatility and an easy integration.
Screws that won't fall out of the cover during installation make the assembly easier and ensure that the IP rating of the converter is not compromised.
Storing the historical readings and repeatedly sending them in each message to ensure the data recovery even if one or two messages are lost.
For the installations without an electrical power supply, the converter is available in a battery-powered version, ensuring long battery life even with the frequent data readings. For the demanding applications, a version with an external power is available.
How Does it Work?
NB-IoT connectivity – these days, it already has a coverage almost everywhere, with the ability to reach even  the basements.  SIM cards can be obtained for as little as 1 EUR per year.
Support for up to 4 connected devices, providing the maximum flexibility during the installation. This ensures that you won’t need to return for an additional device if there’s one more meter than expected during the installation.
Two-piece EUROCLAMP connector – an industry-standard two-piece terminal block for  quick and secure connections. The advantage of the two-piece terminal block is the ability to prepare the meter connections in advance and then simply attach the terminal block to the PCB.
The antenna connector is designed to minimize losses, ensuring the highest possible reception sensitivity.
The device can be used inside a heat exchange station and despite the high-temperature environment, it provides a stable signal. Thanks to the standard SMA connector, you can use a cable to extend the converter from the hard-to-reach places.
A large battery with a lifespan of over 10 years, taking into account the frequency of readings.
Waterproof enclosure (IP67) for the outdoor installations – ideal for mounting on the wall of a water meter shaft.
The converter, with its wide input tolerance, is compatible with various meters from different manufacturers, ensuring the versatility and an easy integration.
Screws that won't fall out of the cover during installation make the assembly easier and ensure that the IP rating of the converter is not compromised.
Storing the historical readings and repeatedly sending them in each message to ensure the data recovery even if one or two messages are lost.
For the installations without an electrical power supply, the converter is available in a battery-powered version, ensuring long battery life even with the frequent data readings. For the demanding applications, a version with an external power is available.
How Does it Work?
An internal antenna for the ATEX certification compatibility and to accelerate the installation process.
A display on the device for the immediate viewing of the reading, time and the unique gas meter ID, configurable by the user.
A user-replaceable battery with a lifespan of over 10 years, considering the frequency of readings.
WAGO connector – the industry-standard terminal block for quick and secure connections. It shortens the installation time and helps to eliminate mistakes caused by the insufficient wire tightening in the terminal block.
NB-IoT connectivity – now has the coverage almost everywhere, reaching even to the basement levels and SIM cards can be obtained for as little as 1 EUR per year.
Interface for an optical head and configuration through the IEC 62056-21 interface – an industry standard used in the gas meters. This standard allows you to integrate the device directly into your configuration software.
Waterproof enclosure (IP67) for the outdoor installations.
Screws that won't fall out of the cover during installation make the assembly easier and ensure that the IP rating of the converter is not compromised.
Interface for the optical head and configuration via IEC 62056-21 interface - industry standard used in gas meters. This standard allows you to integrate the device directly into your configuration software.
Storage of the historical readings for up to 40 days with the option for the local or remote retrieval.
Why Choose the ACRIOS Systems Converters?
Support for All the Manufacturers
With our hardware you can read out any wired M-Bus device on the market making it perfect retrofitting tool.
Cyber Resilience Act
We have a full control over each part of the code in our devices. The hardware we produce can be maintained even many years after installation.
Manufactured in the EU
Our converters are manufactured in the Czech Republic with Czech subcontractors. Each unit undergoes final testing while focusing on the functionality of individual communication interfaces and device power consumption.
Total Cost of Ownership
We pay close attention to the TCO - from using a coulomb counter to obtain an accurate battery life to the pre-configured units delivery with your settings.
FUOTA
For all the NB-IoT devices, we can perform the remote firmware updates via the NB-IoT network. This means you don't need to make any changes to the installation.
With Your SIM Cards
We prioritize privacy and data security—use your own SIM cards and keep sensitive data to yourself. Our part of the puzzle is the hardware and we’re happy to assist with everything else.
Technical Support
Good technical documentation is the foundation of quick integration. On our Wiki, you'll find integration manuals, communication protocol descriptions and videos explaining the usage.
Ability to Read up to 6 Floors
With our converters, you can cover up to 6 floors, depending on the building type and meters. We’ve focused on sensitivity to minimize TCO as much as possible.
With our hardware you can read out any wired M-Bus device on the market making it perfect retrofitting tool.
We have a full control over each part of the code in our devices. The hardware we produce can be maintained even many years after installation.
Our converters are manufactured in the Czech Republic with Czech subcontractors. Each unit undergoes final testing while focusing on the functionality of individual communication interfaces and device power consumption.
We pay close attention to the TCO - from using a coulomb counter to obtain an accurate battery life to the pre-configured units delivery with your settings.
For all the NB-IoT devices, we can perform the remote firmware updates via the NB-IoT network. This means you don't need to make any changes to the installation.
We prioritize privacy and data security—use your own SIM cards and keep sensitive data to yourself. Our part of the puzzle is the hardware and we’re happy to assist with everything else.
Good technical documentation is the foundation of quick integration. On our Wiki, you'll find integration manuals, communication protocol descriptions and videos explaining the usage.
With our converters, you can cover up to 6 floors, depending on the building type and meters. We’ve focused on sensitivity to minimize TCO as much as possible.
What Obstacles Might You Encounter?
If you have ever worked with the wM-Bus meters—perhaps as part of an effort to comply with the EED directive—you have likely encountered these following situations:
Possible Issues:
  • The meter sends multiple telegrams, but you only need one specific one.
  • The meter reports under a radio ID, but you only have the serial number of the water meter—or vice versa.
  • Your installation includes both wM-Bus OMS meters and proprietary protocols.
  • You have meters from two manufacturers in your installation, but each offers a reading system only for their own devices.
  • The meters transmit every 4 hours, but you need daily readings from a battery-powered system.
  • You don't want an externally powered reading system due to the need for electrical inspection and home owner approval.
  • Midway through the life of the reading system, the meters are replaced and everything needs to be reconfigured on-site.
Our Solution

All of these challenges have been solved. ACRIOS Systems converters are designed to cover the widest range of meters, from open standards like wM-Bus OMS to various proprietary protocols—whether it’s Sontex Supercom, Apator Metra protocol or Sensus Bubble UP, we can handle it.

The converter is designed for a seamless integration into existing systems. We use dual D-Cell batteries, which easily provide a lifespan of over 10 years.

Technical Specifications
  • Support for wM-Bus, wM-Bus OMS, Sensus BUP, Sontex Supercom and Apator Metra protocols
  • Reads up to 800 devices per converter

  • Covers up to 6 floors

  • Dual batteries provide over 10 years of life with daily readings from Monday to Friday

  • Firmware update over the air – we can remotely update FW

  • Devices can be configured remotely over the network, with no need for any local configuration

  • Filtering by meter ID, manufacturer ID, or the meter type

  • Ability to schedule readings within a calendar

  • Frequently used to comply with EED directives, for data collection in ESG initiatives, or in accordance with the Heating Cost Ordinance
  • Weight: 475 g with battery
  • IP Rating: IP67
  • Battery Capacity: 38 Ah / 10+ years
  • Supported Modes / Protocols: S-mode, T-mode, C-mode, Sensus BUP (Sensus RF), Sontex Supercom, Apator Metra
  • Maximum Number of Devices: 800 unique IDs
  • Features: Device type filtering, ID filtering, transparent wM-Bus bridge, discovery scan, active error reporting, NB-IoT network failure recovery mechanisms, scheduled reading
  • NB-IoT: 3GPP rel. v.14

Maddalena

  • Maddalena RADIO EVO
  • Maddalena RADIO EVO
  • Maddalena ITN GRADUS
  • Maddalena MicroCLIMA EVO
  • Maddalena ARROW EVO
  • Maddalena ARROW SPLIT
  • Maddalena ELECTO SJ
  • Maddalena ELECTO SONIC

B-Meters

  • B-Meters IWM-TX3
  • B-Meters IWM-TX4
  • B-Meters IWM-TX1
  • B-Meters HYDRODIGIT

Apator Metra

  • Metra E-ITN 30
  • Metra E-RM 30
  • Metra E-ITN 40
  • AT-WMBUS-16-2
  • Apator ULTRIMIS

Sontex

  • Sontex Ei6500-SA2-R
  • Sontex Supercom 581
  • Sontex Supercal 739
  • Sontex Superaqua 1
  • Sontex 566
  • Sontex 556
  • Sontex 587
  • Sontex 868

Diehl

  • Diehl SHARKY 775
  • Diehl SHARKY 774
  • Diehl HYDRUS wM-Bus

Sensus

  • Sensus iPERL 433
  • Sensus iPERL 868
  • Sensus MeiStream

Ostatní

  • BFW 240 radio
  • Engelmann HCA e2
  • ZENNER Zelsius
  • ZENNER Minomess
  • Kamstrup Multical 21
  • Flamco LogoplusSonic
  • Landy&Gyr ULTRAHEAT T330 (UH30…)
  • AXIS Industries WFH-M
  • ENBRA ER-AM with radiomodul
  • WEHRLE modul

Qundis

  • Qundis Q Cal 5.5
  • Qundis Q Water 5.5

and others

  • ACR-CV-101NI-W-D2 - wM-Bus 868MHz to NB-IoT with double battery cell, internal NB-IoT antenna andexternal wM-Bus antenna
  • ACR-CV-101NI-W433-D2 - wM-Bus 433MHz to NB-IoT with double battery cell, internal NB-IoT antenna andexternal wM-Bus antenna
  • 1x wM-Bus to NB-IoT converter
  • 1x Installation manual
  • 1x Battery
  • 1x wM-Bus 2JW0315-868-C675 antenna
Selected Projects
I will be happy to discuss everything with you.
Lukáš Smetana
CSO
Thank you for your inquiry. We will address it as soon as possible.
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"The remote gas meter reading devices from ACRIOS have proven their reliability and quality of workmanship. We appreciate that all our technical requirements were met and that we received all the necessary documentation and technical support for integration into our information system. We are very satisfied with the cooperation..“

Michal Volný, Head of Technical Services

ACRIOS was instrumental in our success on a large-scale European deployment of the wM-Bus concentrators, helped to solve all of the technical challenges and deliver results within the set deadlines.

Lukas Mickus, Project manager

ACRIOS’ reliable products for remote readings and innovative, fully customizable solutions perfectly complement our expertise in value-added distribution of IoT products and solutions. We are proud to collaborate with a company that shares our commitment to excellence and customer satisfaction.

Ivana Janković Šafarić, CEO

We successfully integrated the ACRIOS Data Concentrator into our smart metering project, seamlessly connecting hundreds of meters. The device’s performance and stability have been outstanding, even in challenging environments. The LoRaWAN protocol used by the concentrator ensures strong, reliable signal coverage, even in hard-to-reach areas. We highly recommend the ACRIOS Data Concentrator to anyone looking to enhance their smart metering infrastructure.

Iván Martín Díez, Technical Project Manager

“The ACRIOS scripting capabilities have provided Netmore with the required solution for solving integrations with MBUS/MODBUS units.”

Jimmy Björklund, Lead Solution Architect at Netmore

We offer the ACRIOS remote reading solutions to all of our customers who want to comply with the EED decree. The solution is quick to install, requires no training and proves to be stable over time.

Jaroslav Brzokoupil, CEO

“We were searching for a way that would allow us to connect existing M-Bus and MODBUS meters to our LoRaWAN network and found the solution provided by ACRIOS valuable for these use cases.“

Martin Brunner, Head of Supply Chain at Netmore