AYA 6Ft (6 Feet) USB to TTL 3.3V 6-Pin Serial Cable FTDI Chipset for Win 7/8/10, Mac, Linux and Android &hellip; The FTDI USB-to-TTL (Serial) Cable 3.3V is a USB to Serial (TTL level) converter which allows for a simple way to connect TTL interface devices to USB. Pinout: Pin 1 Black (GND) Pin 2 Brown (CTS) Pin 3 Red (VCC) Pin 4 Orange (TXD) Pin 5 Yellow (RXD) Pin 6 Green (RTS) The I/O pins of this FTDI cable are configured to operate at 3.3V. Can be used to program your Arduino Pro, Pro Mini and Lilypad Compatible with Windows XP/7/8/10, Linux, Android and MAC