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install driver for mac os sierra http://www.mblock.cc/posts/run-makeblock-ch340-ch341-on-mac-os-sierra
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run this command
screen /dev/tty.wchusbserial1410 115200
install driver for mac os sierra http://www.mblock.cc/posts/run-makeblock-ch340-ch341-on-mac-os-sierra
run this command
screen /dev/tty.wchusbserial1410 115200