How can I use the Vehicle Network Toolbox to transmit CAN messages asynchronously

I need to transmit CAN messages neither periodicly nor on data change, which are the only two options in the CAN Transmit block. Putting the CAN Transmit block within a triggered subsystem doesn't seem to prevent the transmit if periodic is selected once it triggers the first time. Is there a way to indicate to trigger a CAN Message transmit asynchronously based on some logic within my model?

As a quick example of a use case, the heartbeat protocol from CANOpen would have a single message on a device's logical 'boot' with data 0x00. After that, the device moves to pre-op and a periodic message is sent with data 0x7F at some defined rate. If a NMT start is received, the data changes to 0x05 for operational. If a NMT stop is received, the message stops transmitting completely.

Answer 1

[Ninad]

Hi Allen,

You can use Event-Based CAN Message Transmission Behavior in Simulink. This feature allows for CAN and CAN FD message transmission when a change in data from one time step to the next is detected. Here is the reference link:

https://in.mathworks.com/help/vnt/ug/event-based-can-transmission-in-simulink.html

You will also have to Implement a custom logic or state machine to manage CAN message transmission in your model.

Regards,

Ninad