BW2031 J1939 to Modbus Interface Gateway Support
Documents and Downloads
BW2031 Sample Configurations & Application Notes
Commonly Asked Questions
How do I migrate my AB7606 to the new BW2031
What are the installation requirements?
24VDC — see the user manual for the operating voltage range and other specifications.
- 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?
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?
- 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.
- 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?
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.