How to reset the serial ports on a Mac ?

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hello,

sometimes after bad transmission between arduino ide (v 1.0.5/mac) , board serial port seem blocked.

then have 2 issues:
1. list of serial ports not refreshed upon board connection.
2. ide won't open serial monitor , stuck.

i have force quit application , of time have restart user session in macos.
isn't there easier way reset serial ports ?

thank in advance.

what mean "bad transmission"?


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