USB to RS-232 Adapter (35cm) - UC232A, ATEN Converters | ATEN Corporate Headquarters
FT232R USB UART Driver for Windows | DriverFinder
Amazon.com: WITMOTION USB-UART Converter 3-in-1 Multifunctional(USB to TTL/ USB to RS232/ USB to RS485) 3.3-5V Serial Adapter, with CH340 chip Compatible with Windows 7,8,Linux,Arduino for Development Projects : Electronics