Communicate with Arduino that is connected through a 4-port USB hub.

Hi,

I used to communicate with Arduino through MATLAB by connecting it to COM5 port and using this code:

%%Connect to Arduino
Arduino= serial(sprintf('COM5');
set(Arduino, 'BaudRate',9600, 'DataBits',8,'Parity','none', 'StopBits',1);
fopen(Arduino);
fprintf('Arduino is open!\n');
pause;

However, I now need to use 4-port USB hub as I have to connect additional USB devices (e.g., keyboard, webcam) and I have no more ports available. I connect the Arduino to that USB hub with the other devices. However, if I now run the code, it gives me an error:

Error using serial/fopen (line 72)
Open failed: Cannot connect to the COM5 port. Possible reasons are another
application is connected to the port or the port does not exist.

Error in ActArduino (line 9)
fopen(Arduino);

My question is: How can I now access the Arduino from the USB hub with Matlab?

[Nagarjuna Manchineni]

When Arduino is connected to the USB hub, are you able to use Arduino IDE to deploy and run a simple code? Also, can you verify whether the Arduino is available to be accessed by any other application through the Serial port (COM 5 in your case)?