QGroundControl connection check serial name and baud

Hello,
I am using linux nad QGC and i would like to ask if i could check connection?
What i mean - inspect serial name, used baudrate?
Tell me if i am wrong, according to this post
https://discuss.ardupilot.org/t/cannot-connect-usb-to-pixhawk-on-linux/7449/3
Serial should be dev/ttyACM0 ?