Serial Port not detected

2012 6 21
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11 次查看（30 天）

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Hi, I am using a usb dongle to communicate with my robocar. Hence, I write the the code as follow: code:
device=instrfind;
but the answer I obtained is empty array. May I know what is the problem? By the way, I can communicate my robocar with hyper terminal. Thanks

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Shawn Chang
Shawn Chang 2012-6-21
The COM port is available at device manager which is COM6. But,Matlab unable to detect it even though i try to restart matlab and detect it again. Yet, there's still no solution. I'm doing this for my final year project and i need help urgently. Thanks
Shawn Chang
Shawn Chang 2012-6-21
May I know is the Virtual USB Serial Ports can be detected in matlab? Since it is shown in list of port in device manager. Thanks
Walter Roberson
Walter Roberson 2012-6-21
In theory they should show up, provided that they were turned on and connected at the time that MATLAB was started, and provided that the vendor-provided driver had previously been installed.
Shawn Chang
Shawn Chang 2012-6-21
But, for my situation, matlab didn't detected my virtual usb serial port. Is there any solution, so that matlab can recognize the port?
Walter Roberson
Walter Roberson 2012-6-21
Sorry, I do not know. I would suggest opening a case with Technical Support.
Shawn Chang
Shawn Chang 2012-6-21
Anyhow, thanks for your replied and information. I will try to check is there any solution for this.
Shawn Chang
Shawn Chang 2012-6-21
http://www.mathworks.com/matlabcentral/answers/1099-does-serial-detect-a-virtual-com-port
By referring to this thread, i obtained the following result:
s=instrhwinfo('Serial')
s =
AvailableSerialPorts: {2x1 cell}
JarFileVersion: 'Version 2.9.0'
ObjectConstructorName: {2x1 cell}
SerialPorts: {2x1 cell}
s.AvailableSerialPorts
ans =
'COM5'
'COM6'
This should be the solution for my problem.

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