J1939 Communication

Vehicle network communication using J1939 protocol

Create J1939 parameter groups and channels to transmit over a CAN network using MATLAB^® or Simulink^®.

Note

You cannot run on Linux^® any Simulink models that contain blocks from the Vehicle Network Toolbox™ J1939 Communication block library.

Functions

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J1939 Channel

`canDatabase`	Create handle to CAN database file
`j1939Channel`	Create J1939 CAN channel
`configBusSpeed`	Configure bit timing of J1939 channel
`start`	Start channel connection to J1939 bus
`stop`	Stop channel connection to J1939 bus
`receive`	Receive parameter groups from J1939 bus
`transmit`	Send parameter groups via channel to J1939 bus
`discard`	Discard available parameter groups on J1939 channel
`filterAllowAll`	Open parameter group filters on J1939 channel
`filterAllowOnly`	Allow only specified parameter groups to pass J1939 channel filter
`filterBlockOnly`	Block only specified parameter groups on J1939 channel filter

J1939 Parameter Group

`canDatabase`	Create handle to CAN database file
`j1939ParameterGroup`	Create J1939 parameter group
`j1939ParameterGroupImport`	Import J1939 log file
`j1939ParameterGroupTimetable`	Convert CAN messages or J1939 parameter groups into timetable
`j1939SignalTimetable`	Create J1939 signal timetable from J1939 parameter group timetable
`extractAll`	Occurrences of specified J1939 parameter groups
`extractRecent`	Occurrences of most recent J1939 parameter groups
`extractTime`	Occurrences of J1939 parameter groups within time range

Properties

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Channel and Parameter Group Objects

j1939.Channel Properties	Properties of the `j1939.Channel` object
j1939.ParameterGroup Properties	Properties of the `j1939.ParameterGroup` object

Blocks

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J1939 Communication Block Library

J1939 Network Configuration	Define J1939 network configuration name and database file
J1939 Node Configuration	Configure J1939 node with address and network management attributes
J1939 CAN Transport Layer	Transport J1939 messages via CAN
J1939 Transmit	Transmit J1939 message
J1939 Receive	Receive J1939 parameter group messages

Topics

J1939 Interface
J1939 is a high-level protocol built on the CAN bus that provides serial data communication between electronic control units (ECUs) in heavy-duty vehicles.
J1939 Parameter Group Format
The application layer deals with parameter groups (PGs) sent and received over the network.
J1939 Network Management
Each device on a J1939 network has a unique address.
J1939 Transport Protocols
J1939 transport protocol breaks up PGs larger than 8 data bytes and up to 1785 bytes, into multiple packets.
J1939 Channel Workflow
Diagram to transmit and receive J1939 parameter groups.
MathWorks Virtual Channels
Emulate virtual CAN channels provided with the toolbox.
Supported Block Features
Supported features of blocks in the Vehicle Network Toolbox block library.
Timing in Hardware Interface Models
Determine block execution frequency and relate to real-world time.

Featured Examples

Get Started with J1939 Parameter Groups in MATLAB

Create and manage J1939 parameter groups using information stored in DBC-files. This example uses file J1939.dbc. Creating and using parameter groups this way is recommended when needing to transmit data to a J1939 network.

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Get Started with J1939 Communication in MATLAB

Create and use J1939 channels to transmit and receive parameter groups on a J1939 network. This example uses the database file J1939.dbc and MathWorks virtual CAN channels connected in a loopback configuration.

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Get Started with J1939 Communication in Simulink

Use J1939 blocks to directly send and receive Parameter Group (PG) messages in Simulink.

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Replay J1939 Logged Field Data to a Simulation

Replay J1939 data from a BLF-file acquired from a J1939 system in a real-world application, such as a vehicle running in the field. The Simulink model runs a simple horsepower estimator algorithm to trigger a fault that might have occurred in the field. The example takes you through a part of the model-based workflow using field data to recreate a fault that was present in the Simulink algorithm before it was deployed onto an ECU, and can be extended to test any algorithm model to debug faults.

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Decode J1939 Data from MDF-Files

Import and decode J1939 data from MDF-files in MATLAB for analysis. The MDF-file used in this example was generated from Vector CANoe using the "System Configuration (J1939)" sample. This example also uses the CAN database file, Powertrain_J1939_MDF.dbc, provided with the Vector sample configuration.

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Decode J1939 Data from BLF-Files

Import and decode J1939 data from BLF-files in MATLAB for analysis. The BLF-file used in this example was generated from Vector CANoe using the "System Configuration (J1939)" sample. This example also uses the CAN database file, Powertrain_J1939_BLF.dbc, provided with the Vector sample configuration.

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