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TRENDnet TU-S9 USB to Serial Converter USB 1.1 to RS-232 Male DB9 Serial Cable | Door locks, cabinet hardware, home alarms, custom doors, smart home products and custom doors.
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Amazon.com: Plugable USB to Serial Adapter Compatible with Windows, Mac, Linux (RS-232DB9 DTE Male Connector, Prolific PL2303HX Rev. D Chipset) : Electronics
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USB/Serial Converter [FT232RL] : ID 18 : $17.50 : Adafruit Industries, Unique & fun DIY electronics and kits
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