EZ Gateway M-Bus to Modbus and BACnet

The Quick and Easy M-Bus to Modbus and BACnet Solution

The EZ Gateway M-Bus to Modbus and BACnet is an easy to use, high-performance building and industrial automation protocol gateway for integrators to interface M-Bus products to Modbus and BACnet management systems in commercial buildings, campuses and industrial facilities over Modbus RTU, Modbus TCP/IP, BACnet MS/TP or BACnet/IP protocols. M-Bus products encompass a wide range of applications such as energy, gas, heating, water, VFD drives and PLCs. M-BUS to Modbus and BACnet protocol translations include:

  • M-Bus to Modbus RTU
  • M-Bus to Modbus TCP/IP
  • M-Bus to BACnet/IP
  • M-Bus to BACnet MS/TP

The EZ Gateway M-Bus to Modbus & BACnet combines field-hardened M-Bus, Modbus and BACnet protocol drivers with an easy to use configuration interface that, once configured, allows M-Bus devices to be presented as virtual BACnet devices which simplifies commissioning, configuration and troubleshooting. The intuitive web-based interface allows configurations to be built in the field or in the office. Additionally, the configuration profiles can be downloaded and then uploaded to other FieldServer M-Bus applications, simplifying the commissioning and integration process on repeatable applications.

Sierra Monitor’s M-Bus Explorer and Profile Loader apps allow each M-Bus device to be auto-discovered, templatized and presented to quickly configure new M-Bus devices. This makes each corresponding M-Bus device into a virtual BACnet device within the EZ Gateway, thereby providing granular visibility and control over each device from within a BACnet management framework. For example, offline / online status is visible at the individual M-Bus device level.

With the EZ Gateway M-Bus to Modbus & BACnet, the integrator or contractor does not need to be a protocol expert, and can minimize configuration and commissioning time, while also reducing ongoing operating and maintenance costs.

Accessing the EZ Gateway Through FieldPoP

Enjoy the benefits of the cloud connectivity through FieldPoP™. The EZ Gateway KNX to BACnet is FieldPoP-enabled, meaning all EZ Gateways can be registered to FieldPoP, Sierra Monitor’s device cloud for the IIoT.

The FieldPoP web interface lets users remotely access, in a secure fashion, the FS-GUI and configuration web applications that are available locally on the EZ Gateway. These applications offer functionality for configuration, monitoring, logging, security, diagnostics, and updates.

Learn more about FieldServer and FieldPoP capabilities »

EZ Gateway M-Bus to Modbus and BACnet

  • M-Bus Interoperability:
    • M-Bus Explorer discovers all M-Bus devices in the network, shows the manufacturer details as well as available points, and offers one-click profile generation
    • Profile Loader enables efficient profile editing, exporting and importing
    • Up to 64 slave devices (max device count based on model)
    • Communication between devices with different baud rates at the same time
    • Virtual nodes allow each M-Bus device connected to a single EZ Gateway to be seen as a separate device on the BACnet network
  • BACnet COV: Reduce the amount of BACnet data overhead to allow network traffic to be less congested by transmitting data only when detecting a KNX device status change
  • BACnet COV support provides fast data communication while reducing the traffic over a BACnet network
  • BACnet BBMD Server support for connecting to remote BACnet networks
  • Diagnostics of the devices connected to the network is available via Web Interface
  • FieldPoP Device Cloud support: Register your EZ Gateway to the FieldPoP interface for remote access to local applications, configuration, and device management

EZ Gateway M-Bus to Modbus and BACnet

Model Numbers

  • FS-EZ1-MBUS-MOD-BAC: 16 slave devices
  • FS-EZ2-MBUS-MOD-BAC: 32 slave devices
  • FS-EZ3-MBUS-MOD-BAC: 64 slave devices


  • Operating Temperature: -40 to 75°C (-40 to 167°F)
  • Relative Humidity: 5-90% RH non-condensing

Power Requirements

  • 9-30V DC or 12-24V AC
  • Current draw: @ 12V
    • 1 Slave: 580 mA
    • 64 Slaves: 980 mA

Physical Dimensions

  • H x W x D: 4.5 x 2.9 x 1.6 in. (11.5 x 7.4 x 4.1 cm)
  • Weight: 0.4 lbs (0.2 Kg)
  • Input voltage: 24V DC nominal: 10-30V DC


  • Configuration/Diagnostic utilities
  • Table, wall, or DIN rail mount


  • Baud: 2400, 4800, 9600, 19200, 38400
  • Start Bit: 7, 8
  • Ethernet: 10/100 BaseT MDIX


  • TUV Approved to UL 916, EN 60950-1, EN 50491-3 and CSA C22.2 standards
  • BTL Certified, Rev. 12
  • RoHS Compliant
  • GOST-R Certified
  • CE and FCC

Protocol Drivers

The M-BUS to BACnet and Modbus EZ Gateway from Sierra Monitor supports various flavors of M-BUS, BACnet, and Modbus protocols, and provides internetworking across the protocols:


EZ Profiles

The EZ Profiles listed in our interactive library have been created by our Configuration Engineers for the EZ Gateway, and are written for common field devices. Uploading our M-Bus to Modbus and BACnet EZ Profiles into the EZ Gateway requires minimal effort by a integrator, relieving the need to spend unnecessary time writing a new Profile configuration every time a Profile is required to map a device.

Although all of our EZ Profiles can be downloaded for no cost, we do not have EZ Profile configurations for every field device. Through the EZ Gateway web interface, we provide you with the tools to create or modify our existing EZ Profiles. Please submit any EZ Profiles you have created or modified to support@sierramonitor.com and upon review, we can add them to our EZ Profile library for use by the M-Bus to Modbus and BACnet community.

How to Load an EZ Profile

To load a M-Bus to Modbus and BACnet EZ Profile into the EZ Gateway web interface, choose "Device Profiles" under "Sections," click on the arrow next to "Add," and select "Import."

Importing a Profile

Download M-Bus to Modbus and BACnet EZ Profiles

How to Purchase the EZ Gateway

There are a number of ways to purchase the EZ Gateway:

Find an Online Distributor

A number of our authorized online distributors around the world carry the EZ Gateway M-BUS to BACnet and Modbus:

Contact Us

You can directly contact us to receive a quote: