Serial Communication in Maltab using Linux 64 Bit

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hhn_jb 2015-7-9

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https://ww2.mathworks.cn/matlabcentral/answers/229181-serial-communication-in-maltab-using-linux-64-bit

评论： Ravi Kiran Aggadi 2022-6-8

I use Matlab 2015a (64 Bit) on a Ubuntu Linux distribution system. I want to build a communication to a device with a RS232 port. For this task I use a USB to RS232 converter cabel. In Linux I get the information, that the cable is connected to ttyUSB0. But if i want to start the communication over Matlab with:

s = serial('/dev/ttyUSB0', 'BaudRate', 9600);
fopen(s)

I get the error:

Error using serial/fopen (line 72)
Open failed: Port: /dev/ttyUSB0 is not available. ....

I tested this process on a WIN System and there is no problem. The communication runs pretty well. Have anyone experieances with Linux/Matlab and serial communication?

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William Harwin 2017-3-9

在 MATLAB Online 中打开

This is in fact a Linux permissions problem rather than a Matlab problem. To test permissions see if there is a difference between

sudo stty -a -F /dev/ttyUSB0

and

stty -a -F /dev/ttyUSB0

If the latter says 'permission denied' or similar then you are probably not a member of the relevant group. The group on the USB port can be seen by using

ls -l /dev/ttyUSB0

and can be changed via

sudo usermod -aG groupname username

e.g.

sudo -aG dialout harrypotter

Check membership via the `group' command (a reboot may be necessary)

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