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The EZ Gateway Modbus to BACnet (FS-EZX-MOD-BAC) is an easy to use, high-performance building and industrial automation protocol gateway for integrators to interface Modbus certified products to BACnet management systems in commercial buildings, campuses, and industrial facilities. Modbus-certified products encompass a wide range of applications such as energy, gas, heating, water, VFD drives, and PLCs. The EZ Gateway Modbus to BACnet integrates such Modbus-based devices and systems to BACnet-based
management systems over BACnet MS/TP or BACnet/IP protocols.

The EZ Gateway Modbus to BACnet combines field-hardened Modbus and BACnet protocol drivers with an easy to use configuration interface. The EZ Gateway’s Modbus interface is compatible with all Modbus-certified products, while the EZ Gateway’s BACnet interface has been certified by BACnet Test Laboratory (BTL). The intuitive web-based interface allows configurations to be built in the field or in the office, thereby simplifying the commissioning and integration process.

The unique FieldServer DeviceProxy™ feature allows each Modbus device to be presented as a corresponding virtual BACnet device within the EZ Gateway, thereby providing granular visibility and control over each Modbus device from within a BACnet management framework. For example, offline / online status is visible at the individual Modbus device level.

With the EZ Gateway Modbus to 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.

With our long-standing association with the Modbus Organization and total commitment to the Modbus standard, we consistently implement the latest Modbus innovations on our FieldServer protocol gateways and test them thoroughly for interoperability. With tested Modbus features like bit extracting, 32 bit float/integer support, and scaling, our EZ Gateway Modbus to BACnet can work with virtually any Modbus device out of the box. Instant interoperability means that there the devices can be commissioned quickly.

Unparalleled Performance

The EZ Gateway Modbus to BACnet has two RS-485 ports, enabling connection for fewer devices per port, which improves response time. With two RS-485 ports, up to 64 Modbus RTU devices can be connected to the EZ Gateway without the need of adding a repeater to the RS-485 network. Compared to single-port gateways, our dual-port EZ Gateway can reduce the cost of device connectivity or double the speed of connected devices.

The EZ Gateway can connect to 100 Modbus TCP/IP devices via Ethernet. In addition, support for Modbus TCP/IP Concurrent Polling on our EZ Gateway enables faster response time and more devices per segment in situations where the Modbus field devices also support concurrent polling.


  • Register your EZ Gateway to the MSA Grid interface for remote access to local applications, configuration, and device management


  • Connect with virtually any Modbus device out of the box
    • Modbus Data Manipulation: Efficiently translate between Modbus and BACnet devices through bit extracting
    • Modbus TCP/IP Concurrent Polling: Receive faster response time and support more devices per segment


  • Lower commissioning time by uploading preconfigured verified Modbus-BACnet EZ Profiles


  • Minimize management and operational costs with granular visibility and control over each Modbus device from a BACnet management station


  • Improve response time by connecting fewer devices per port or support more devices per gateway


  • All FieldServer gateways come with Remote Access support. Once registerd to the MSA Grid, use the Remote Access capability to attach to the FieldServer gateway to monitor, maintain and troubleshoot installed equipment

Model Numbers

  • FS-EZ3-MOD-BAC: 500 point capacity
  • FS-EZ4-MOD-BAC: 1000 point capacity


Operating temperature: -40oC to 75oC (-40oF to 167oF)
Relative humidity: 5-90% RH non-condensing

Power Requirements

  • 9-30 VDC or 24 VAC
  • Current draw @ 12V:
    • FS-EZx-MOD-BAC: 240 mA


  • Dimensions: 4 x 1.1 x 2.7 in (10.16 x 2.8 x 6.8cm)
  • Weight: 0.4 lbs (0.2 Kg)


  • Configuration/Diagnostic utilities
  • DIN rail mount


  • Baud: 4800, 9600, 19200, 38400, 57600, 115200
  • Start Bit: 7, 8
  • Stop Bit: 1, 2
  • Parity: Even, Odd, None
  • Ethernet: 10/100 BaseT MDIX


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