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I know that I can launch Screen as a serial port terminal from scratch. What I want to do is to create a new window inside an already running screen session as a serial terminal. so that I don't need to create a window and run minicom in it.

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CtrlA :screen /dev/ttyS0

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Doesn't work for some reason. That was what i tried before asking. – Atilla Filiz Jan 20 '11 at 14:49
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Type this on a command line within a screen session.

For a built in serial port.

screen -x screen /dev/ttyS0

For a usb-to-serial port adapter.

screen -x screen /dev/ttyUSB0
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