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BridgeWay J1939 to Modbus Interface

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Our BridgeWay™ J1939 to Modbus Interface Gateways provides connectivity between a Modbus RTU (RS485 serial 2 wire) network and a J1939 (CAN) network. The gateway operates as a Modbus RTU Slave device, allowing a Modbus RTU Master to read and write J1939 PGN data.

We provide a free downloadable Windows-based configuration tool (BWConfig). This PC-based software allows users to map J1939 parameter (PGN) data into the device I/O table memory, which is accessible from a Modbus RTU Master as Modbus registers.

Configuration of our gateways is easy with BWConfig. It consists of setting up an I/O table containing the J1939 PGNs you wish to read or write, and determining the rate at which each will be read or written from/to the J1939 network. BWConfig maps the I/O table to a range of Modbus registers accessible from the device Modbus RTU interface. Users download the configuration from BWConfig to the device via an RS232 connection. It saves in Flash memory. You can also upload an existing configuration from the device for comparison or to update the configuration.

J1939 to Modbus Gateway

Generation 2
BW2031 BridgeWay Gateway  

 J1939 to Modbus Gateway


  • Dimensions: 110 x 35 x 101 mm / 4.33 x 1.38 x 3.98 in
  • Operating voltage: 7 – 40 VDC
  • Operating temperature: -25°C – 70°C
  • Current requirements: 300mA at 24 VDC
  • Mechanical rating: IP20 NEMA rating 1
  • Approximate weight: 184g
  • Certifications:
    • UL certification: UL 61010-1 and UL 61010-2-201
    • ATEX certification: EN 60079-0 and EN 60079-15
    • CE certification: EN 61000-6-2 and EN 61000-6-4


  • Configurable so the user can specify which J1939 PGN messages the module should transmit or receive
  • Modbus RTU support for 4800, 9600, 19200, 38400, 57600 and 115200 baud rates
  • Supports SAE J1939 vehicle protocol and Modbus RTU (Slave) industrial automation protocol
  • Works with Modbus RTU Master PLCs, HMIs and other devices
  • Configuration via free Windows-based software tool (BWConfig 2.0) – save, edit and load configurations
  • Uses standard USB cable for configuration (USB to micro-USB)
  • Supports Flash field upgrades
  • LED network and module status indicators
  • Includes DIN rail mount
  • Brand label/OEM options

Optional Accessories

BW2031 Migration Wire Harness (Part No. BW2031-MH)

  • J1939 to Modbus GatewayAllows direct connection to existing BridgeWay 1.0 (AB7606) device
  • Plug the existing 15 pin D-sub connector into the migration harness, import your AB7606 configuration file, download it and you are up-and-running in minutes

CANable Lite – PGN Monitor Package (Part No. CANable Lite)
This quick and easy PC-based software tool is used to view PGN messages on a J1939 (CAN) network which is critical for integrating or troubleshooting an installation. The CANable Lite package includes:

  • USB to CAN adapter
  • CANable Lite PC/Windows software
  • User manual

MasterSim Lite – Modbus RTU Master Simulator (Part No. MasterSim-BW2031)

Used to test Modbus Master connectivity and data mapping without using a PLC/HMI, etc. This tool is critical for integrating or troubleshooting an installation. The simulator includes:

  • USB to RS485 Adapter
  • MasterSim Lite PC/Windows Software
  • User manual


What is included with the device?

When you purchase a BW2031 device, it will come prepackaged with a 3 pin Phoenix connector for power and a 6 pin mini-Phoenix connector to connect your J1939 network to a Modbus RTU network. In addition, each purchase comes with a free license of our configuration tool, BWConfig 2.0, to help you get up and running fast, and a detailed user manual to help you every step of the way.
What protocols are supported by the BW2031 gateway?

Our BridgeWay 2.0 J1939 to ModbusRTU supports the following:

  • J1939 (125k, 250k, and 500k)
  • Modbus RTU Slave (RS-485 2-wire 4800 to 115200 baud)

What is required, but NOT included?

  • A properly-wired and terminated J1939 network
  • A properly-wired and terminated Modbus RTU (RS485 2 wire) network
  • A Modbus RTU Master device (PLC, HMI, etc.)
  • Proper 24 VDC power
  • A PC or laptop to run the BWConfig 2.0 tool
  • A Micro USB to USB cable to connect a PC-running BWConfig2.0 to the BridgeWay 2.0

Can I use one BW2031 to read/write PGN messages on two or more J1939 engine networks?

No. To do this, it would require that you connect the networks together physically. Engine control systems are generally designed as self-contained J1939 networks and the CAN addresses (e.g. Address 0 for the engine ECU) would collide with the ECU address for another engine network if they were tied together. You may also run into termination and network trunk/drop length issues.

To achieve this, one BW2031 module would be required for each J1939 engine network. The BW2031 can then have the same J1939 (CAN) address on each individual J1939 network but the host (Ethernet, Modbus RTU, or PROFIBUS) address will have to be unique for each gateway if using a single PLC to read and write data.

Can the device poll other Modbus RTU Slaves?

No, the BW2031 is a Modbus RTU Slave only and a separate Master is required on the network.

What J1939 PGN messages does the BW2031 support?

The BW2031 supports all standard SAE PGN messages, proprietary range PGNs, and DM1, and DM2. You configure the BW2031 for the input and output PGNs/SPNs you need for your application. Our BWConfig 2.0 configuration tool helps you accomplish this. The BW2031 is not OEM-specific — it is J1939 specific.

Generation 1
AB7606 BridgeWay Gateway  

End of Life Scheduled for 12/31/2021

 J1939 to Modbus Gateway


  • Mechanical dimensions: L=4.96″ (126mm); W=4.30″ (109mm); H=1.65″ (42mm)
  • Approximate weight: 16 oz.
  • Operating voltage: 11 – 32 VDC
  • Current requirements: 93-95 mA at 24 VDC
  • Operating temperature: 0 – 70° C
  • EMC compliance: EN50081-2 and EN50082-2
  • Certifications: CE and cULus
  • UL certification: E203225, Listed 67AM, UL-1604 Class 1, Div 2, GP A, B, C, D, Temp code T4
  • ATEX certification: ATEX 135419, II 3 G, EEx nL IIC T4, DEMKO 03


  • Interface/gateway between PLC/HMI/PC/System and J1939 network
  • Configuration via free Windows-based software tool (BWConfig)
  • Supports Flash field upgrades
  • LED network and module status indicators
  • DIN (includes DIN rail mount)
  • Rugged extruded aluminum enclosure
  • Brand label/OEM options
  • Supports SAE J1939 (CAN) and Modbus RTU Slave (serial RS485)

Optional Accessories

AB7606 Configuration Kit (Part No. AB7606-CFG)

  • 3 meter 25-to-9 pin serial cable used to configure the module with BWConfig software
  • Latest version of AB7606 User Manual, BWConfig software, application notes and sample configurations

The AB7606 15 Pin Connector and Backshell Kit (Part No. AB7606-CON)
The kit contains the material needed to connect AB7606 to a J1939 Network, Module Power and Modbus RTU RS485 network:

  • 15 pin D connector with numbered solder cups

CANable Lite – PGN Monitor/Viewing Package (Part No. CANable Lite)
Used to view the PGN messages on a J1939 (CAN) Network (necessary for integrating or troubleshooting an installation).

  • USB to CAN Adapter
  • CANable Lite PC/Windows Software
  • User Manual

MasterSim Lite – Modbus Master Simulator for the AB7606
Used to test Modbus Master connectivity and data mapping without using a PLC/HMI, etc. (necessary for integrating or troubleshooting an installation).

  • USB to RS485 Adapter
  • MasterSim Lite PC/Windows Software
  • User Manual