ADAFRUIT Industries 954 USB-to-TTL Serial Cable, Raspberry PI (1 Piece) Compatible with Windows XP/Vista/7/8 and MacOS X 10.6 to 10.10 SiLabs CP2012 chipset Ideal for easy debugging of Raspberry Pi and BeagleBone Black USB to TTL Serial Cable Pinout: Red 5V, Black 0V (Ground), White RX, Green TX