Serial port communication on Mac with SCREEN command

Use screen command to communicate with Serial port

1. Open Terminal or iTerm2
2. See if the serial port exists
   

   $ ls -l /dev/cu.*

   crw-rw-rw-  1 root  wheel   20,   1 Jun 10 21:07 /dev/cu.Bluetooth-Incoming-Port
   crw-rw-rw-  1 root  wheel   20,   3 Jun 12 18:13 /dev/cu.usbmodem1421401
   

3. Connect to the port

   $ screen -L /dev/cu.usbmodem1421401 115200

   -L : show log of the command from the serial port

4. Other commands

   # in a running session
   

   Ctrl-A, K : kill the session
   Ctrl-A, D : detach from the session
   

   # out of session
   

   $ screen -ls : list sessions
   
   There is a screen on:
   9244.ttys001.Dee15S (Attached)
   
   Format : [PID].[TTYID].[HOSTNAME]
   
   $ screen -r : attach the default session
   $ screen -r [NAME] : attach to a session named [NAME]
   $ screen -S [NAME] : attach to a session named [NAME]
   $ screen -d [ID] : detach from the session with screen id [ID]