Restart a USB connection

Hi, I have a hardware intrument with a Matlab GUI that calls a few different USB devices. From time to time a USB connection fails. To resolve this I currently need to restart Matlab, the hardware or unplugg/replug the USB device. Is there a way to restart the USB communication from Matlab wihtout restarting any of the hardware or programs?

Thanks Mathias Westlund

[Mickael PIERRE]

Hi there,

I have the same issue. Did you find a way around it?

Thank you,

Mickael

Answer 1

[Walter Roberson]

Mathworks has said there is no current mechanism to do this.

A small number of people have reported success using instrreset, but that is part of the Instrument Control toolbox.

[Mathias Westlund]

Thanks Walter. I will investigate instrreset.

Answer 2

[Gavin]

See this same issue with a solution here

https://www.mathworks.com/matlabcentral/answers/2173049-how-do-i-reconnect-usb-serial-that-gets-lost-programatically

workaround exists: you can delete the existing serial port connection and then establish a new connection. For example:

myComPort = serial('COM5');
fopen(myComPort);
% Now disconnect the device
delete(myComPort);
clear myComPort;
% Reconnect the device; the following will now be successful:
myComPort = serial('COM5');
fopen(myComPort);