If I do not connect to Arduino Due with MatLab. I get the following response in the diagnostic viewer.
The following error occurred during deployment to your hardware board: Could not connect to specified Arduino board.
Verify that the board is connected to your host, and that the host COM port number set in the model matches the COM port number in Windows.
To change the host COM port number in the model, click 'Simulation ', click 'Model Configuration Parameters'... In the dialog that opens, select the 'Hardware Implementation' pane, click 'Target hardware resources > Host-board connection' and set the COM port number.
To find out the COM port number in Windows, open Device Manager and open your board in the COM ports group.
My COM port for the arduino is COM3, which I have already set manually in Simulink.
If I connect to the arduino from MatLab, I get the following response.
The following error occurred during deployment to your hardware board: Open failed: Port: COM3 is not available. No ports are available. Use INSTRFIND to determine if other instrument objects are connected to the requested device.