Ftdi - TTL-232r-3v3 - USB to Serial Converter Cable, 3.3v, 6pin TTL-232R-3V3 - USB TO SERIAL CONVERTER, 	 TTL levels is +3.3V The cables are available with a 6-way SIL, 0.1" connector FTDI based USB to TTL Serial Cable are designed using the the standard FT232RL chipset. Standard pinout: GND (Blk/1), CTS (Brown/2), VCC(red/3), TXD (orange/4), RXD (yellow/5),RTS (Green/6) The TTL-232R cables are a family of USB to TTL serial UART converter cables incorporating FTDIs FT232RQ USB to Serial UART interface IC device which handles all the USB signaling and protocols. The cables provide a fast, simple way to connect devices with a TTL level serial interface to USB