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Pi PORT LIST

Upgraded pyserial to v 3.0.1
list available COM ports:
$ python -m serial.tools.list_ports
/dev/ttyAMA0
/dev/ttyUSB0
/dev/ttyUSB1
3 ports found
running
$ python -m serial.tools.miniterm /dev/ttyUSB0
opens miniterm:
--- Miniterm on /dev/ttyUSB0  9600,8,N,1 ---
--- Quit: Ctrl+] | Menu: Ctrl+T | Help: Ctrl+T followed by Ctrl+H ---
at
OK
works fine.

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