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I've connected to a serial port via screen /dev/ttyACM0 and can read the input, but can't see the text I'm typing and nothing is being sent after I press enter.

Is it possible to send data from screen?

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    Having screen run cu(1) or minicom might offer a better interface than the raw device. – thrig Aug 26 '16 at 20:25
  • "Is it possible to send data from screen?" I have often used screen to access serial devices on OS X, but not on (other) *ix machines. You might try adding the echo parameter, something like screen /dev/ttyACM0 38400,echo or what have you for speed and other serial options. – user4556274 Aug 27 '16 at 0:40
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    You might need to use control-j intead of enter to end a line. it depends on what you have at the other end of the serial line. – meuh Aug 27 '16 at 6:50

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