Configure J1939 node with address and network management attributes
Simulink Real-Time / J1939 Communication
Vehicle Network Toolbox / J1939 Communication
The J1939 Node Configuration block is where you define a node and associate it with a specific network configuration. Its Message information is read from the database for that configuration, unless you are creating and configuring a custom node.
To use this block, you must have a license for both Vehicle Network Toolbox™ and Simulink® software.
The J1939 communication blocks support the use of Simulink accelerator and rapid accelerator modes. You can speed up the execution of Simulink models by using these modes. For more information on these modes, see Design Your Model for Effective Acceleration (Simulink).
The J1939 communication blocks also support code generation that have limited deployment capabilities. Code generation requires a C++ compiler that is compatible with the code generation target. For the current list of supported compilers, see Supported and Compatible Compilers.
Address— Returns the effective address of the node
This optional output port exists when you select the Output current node address check box in the dialog box.
AC Status— Indicates the success (1) or failure (0) of the node’s address claim
This optional output port exists when you select the Output address claim status check box in the dialog box.
Config name— ID of the J1939 network configuration to associate with this node
ConfigX(default) | character vector
To access the corresponding J1939 database, use this ID.
Node name— name of this J1939 node
NodeX(default) | character vector
The available list shows
none if no J1939 network configuration
is found or no node is defined in the associated database. If you are creating a custom
node, the node name must be unique within its J1939 network configuration.
Message— Nine network attributes as defined by the database file consistent with the J1939 protocol
Unless you are defining a custom node, these parameters are read-only:
Allow arbitrary address — Allow/disallow the node to switch to an arbitrary address if the station address is not available. If this option is off and the node loses its address claim, the node goes silent.
Node Address — Station address, decimal, 8-bit.
Industry Group — Decimal, 3-bit.
Vehicle System — Decimal, 7-bit.
Vehicle System Instance — Identifies one particular occurrence of a given vehicle system in a given network. If only one instance of a certain vehicle system exists in a network, then this field must be set to 0 to define it as the first instance. Decimal, 4-bit.
Function ID — Decimal, 8-bit.
Function Instance — Identifies the particular occurrence of a given function in a vehicle system and given network. If only one instance of a certain function exists in a network, then this field must be set to 0 to define it as the first instance. Decimal, 5-bit.
ECU Instance — This 3-bit field is used when multiple electronic control units (ECU) are involved in performing a single function. If only one ECU is used for a particular controller application (CA), then this field must be set to 0 to define it as the first instance.
Manufacturer Code — Decimal, 11-bit.
Identity Number — Decimal, 21-bit.
Sample time— Simulation refresh rate
Specify the sampling time of the block during simulation. This value defines the
frequency at which the J1939 Node Configuration updates its optional output ports. If
the block is inside a triggered subsystem or inherits a sample time, specify a value of
-1. You can also specify a MATLAB® variable for sample time. The default value is
simulation seconds. For information about simulation sample timing, see Timing in Hardware Interface Models.
Output current node address— Enable or disable the Address port display
Enable or disable the Address output port to show the effective address. The effective address is different from the predefined station address. If Allow arbitrary address is selected, a name conflict occurs, and the current node has lower priority. The output signal is a double value from 0 to 253. This port is disabled by default.
Output address claim status— Enable or disable the address claim AC Status display
Enable or disable the address claim AC Status output port to show the success of an address claim. The output value is binary, 1 for success or 0 for failure. This port is disabled by default.