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macos - Mac OS X Mountain Lion doesn't recognize devices plugged into USB serial ports - Stack Overflow
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USB to Serial Adapter, BENFEI USB to RS-232 Male (9-pin) DB9 Serial Cable, Prolific Chipset, Windows 10/8.1/8/7, Mac OS X 10.6 and Above, 1.5M - Walmart.com
TRENDnet USB to Serial 9 Pin Converter Cable Connect a RS 232 Serial Device to a USB 2.0 Port Supports Windows and Mac USB 1.1 USB 2.0 USB 3.0 21 Inch Cable
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