Restart a USB connection

7 次查看（过去 30 天）
Mathias Westlund
Mathias Westlund 2013-1-17
移动：Walter Roberson 2025-10-23
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
  1 个评论
Mickael PIERRE
Mickael PIERRE 2021-3-12
Hi there,
I have the same issue. Did you find a way around it?
Thank you,
Mickael

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采纳的回答

Walter Roberson
Walter Roberson 2013-1-18
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.

更多回答（1 个）

Gavin
Gavin 2025-10-22
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);

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