BW2031 J1939 to Modbus Interface Gateway Support

Documents and Downloads

Commonly Asked Questions

How do I migrate my AB7606 to the new BW2031
Migrating from AB7606 to BW2031 is an easy task with our migration tutorial. Download the tutorial for step-by-step instructions to ensure a smooth and easy migration.
What are the installation requirements?
Unit Power
24VDC — see the user manual for the operating voltage range and other specifications.


J1939 Network

  • Ensure the BW4031 is installed on a properly-wired and terminated J1939 network
  • Ensure the J1939 network length is within specification (max 40-meter trunk with max 3-meter drops from the trunk)
  • Ensure that the BW4031 J1939 node address is unique on the network and is set in a manner that does not interfere with a control network

Modbus RTU Network

  • Ensure the BW2031 is installed on a properly-wired and terminated Modbus RTU network
  • Ensure that the BW2031 Modbus RTU Node Address is unique on the network
How do I configure my BW2031?
You will need BWConfig 2.0 to set the J1939 node address, Modbus RTU node address and the J1939 PGN configuration for the module. BWConfig 2.0 is a Microsoft Windows application that communicates with the BW2031 device over a USB connection. BWConfig 2.0 is compatible with Microsoft Windows XP, Windows 7, 8 and 10.

BWConfig 2.0 allows you to configure the J1939 PGN messages you wish to monitor and/or transmit on the J1939 network. Your input and output PGN configuration represents the data and offsets to the data based on the ordering and layout of the PGN messages in the BWConfig 2.0 tables.

See the BW2031 User Manual for information on how to configure the module.

How do I send messages when needed?
You can achieve this with either method:

  1. Set the rate of the output PGN message to 0, meaning it will not be sent until it is requested on the J1939 by another node.
  2. Use the message bridging feature, which allows the PLC (or other controlling device) to bridge a message “on demand” from Modbus RTU to a J1939 PGN message that will be sent immediately on the J1939 network.
Can the BW2031 operate at multiple addresses on a J1939 (CAN) network?
No, these devices are designed to operate on a single CAN Address. You can enter multiple addresses in the J1939 address list in BWConfig 2.0, but this is only used in the event that the BridgeWay device is unable to “claim an address” on the CAN network that is entered in the list. If this occurs, the device will try the next specified address in the list and will continue this process until it successfully completes the address claim or it runs out of user-specified addresses.

Some J1939 applications require that PGN messages be sent by specific CAN addresses on a single J1939 network. e.g. the engine ECU wants to see remote speed control (PGN 0) from address 7 and ignores it from all other addresses.

In this scenario, one device will be required for each CAN address that needs to transmit PGN messages. Each device will require a unique J1939 (CAN) address (e.g. one at address 7 and the other as address 5) and a unique host (Ethernet, Modbus RTU or PROFIBUS) address if a single PLC is used on a single host network.

Can the BWConfig 2.0 tool show me incoming/outgoing data in the gateway?
No, the BWConfig 2.0 tool only displays configuration, status and diagnostic data. However you can leverage our NetStaX MasterSim Lite – Modbus RTU Master Simulator or NetStaX CANable Lite – J1939 PGN monitoring tools to view incoming and outgoing data.
I configured my BridgeWay correctly but am not receiving PGN data. How do I know that the PGN messages are on the J1939 network?
To do this, you will need a J1939 (CAN) network monitor to view the PGN messages on the J1939 network. Pyramid Solutions offers a J1939 PNG monitoring tool, CANable Lite, to accomplish this. CANable Lite is an inexpensive and simple tool that consists of the CANable Lite Windows Application and a USB to CAN Adapter.

BridgeWay Configuration Tool

Download Now

Get tips, updates and insightful content straight to your inbox.

Subscribe Now

Submit Support Ticket