6

I have a home-made device and I wrote a program for data acquisition from it. But each time I plug-in the device I have to change the permissions for /dev/ttyACM0, so that the port can be used for data transfer. How can I make this device to have read/write permissions by default. The lsusb output for this device is:

Bus 003 Device 005: ID ffff:0005

2 Answers 2

5

If you are a member of the dialout group you can access serial devices, including ttySx, ttyUSBx, and ttyACMx devices, without changing permissions.

$ sudo adduser myusername dialout

Alternatively, you could create a udev rule to set the permissions as the device is attached. See https://askubuntu.com/a/112573/471836

1

I will add an answer to my own question for anyone that will need this in the future. I followed an answer from @Adam Lussier and have created /etc/udev/rules.d/50-ttyusb.rules file with this content (proposed by @Sneetsher):

ACTION=="add", KERNEL=="ttyACM[0-9]*", ATTRS{idVendor}=="ffff", ATTRS{idProduct}=="0005", MODE="0666"

Like this only this specific device is given the read/write permissions. Reference for anyone wanting to know more about writing rules file.

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .