No need to download any software for the Buffalo's SRC06USB. Referring to this silte http://www.ytsuboi.org/wp/archives/1219 http://qiita.com/tukiyo3/items/08ce4b75a8c8dd6d1c43 http://swiftlife.hatenablog.jp/entry/2016/01/13/133640 There are two ways: *cu -l command Aruba-no-MacBook-Air-2:~ aruba$ sudo cu -l /dev/tty.usbserial-FTK1S1BK Password: Connected. 6c:f3:7f:c5:a7:da# cu: Got hangup signal Disconnected. Or *screen command $ ls /dev/tty.* /dev/tty.Bluetooth-Incoming-Port /dev/tty.usbserial-FTK1S1BK $ screen /dev/tty.usbserial-FTK1S1BK 9600