Screen Terminal Commands in Mac OS

To list all USB Serial Ports:

$ ls /dev/tty.*

To Screen on the Serial Port:

$ screen /dev/tty.usbserial-XXXX [baudrate]
$ screen /dev/tty.usbserial-A101Y8E2 115200

To exit from screen:

Hold [Ctrl+a] and press [d]

To list all screen sessions:

$ screen -ls
There is a screen on:
[session id].ttys001.Your-Machine (Detached)
1 Socket in /var/folders/xxxx

To resume from a screen:

$ screen -r
$ screen -r [session id]
$ screen -R

To kill / exit from a session:

$ screen -S [session id] -X quit

Hope it helps you.