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USB/Serial Converter [FT232RL] : ID 18 : $17.50 : Adafruit Industries, Unique & fun DIY electronics and kits
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PL2303HX USB-UART/RS232 Converter on 100cm Cable | Arduino, DIY \ Converters \ RS232 Arduino, DIY \ Converters \ USB / UART
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LFHUKEJI USB TO RS232, USB 2.0 Male to Serial (9-Pin) Female DB-9 RS-232 Adapter Cable 1.5m(FTDI Chipset) : Amazon.co.uk: Computers & Accessories
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Cp2102 Zt213 Usb Rs232 Conversion Board Db9 Nine-pin Diy Serial Cable - Kitchen Islands & Trolleys - AliExpress
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