From terminal, run:
lsof | grep usbserial
If the port is in use, you will get a response like this (otherwise it will return nothing):
screen 27127 Sefi 5u CHR 18,0 0t0 605 /dev/tty.usbserial
Note the session number. In my case, it's 27127. Then run:
screen -x 27127 (obviously use your session number from the grep)
It will return you to your previous screen session. Then use ctr-A ctr-\ to close it properly (will ask you to confirm).
source: https://discussions.apple.com/thread/6078814?tstart=0
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