The cable is easiest way ever to connect to your microcontroller/Raspberry Pi/WiFi router serial console port. Inside the big USB plug is a USB<->Serial conversion chip (Prolific PL2303) and at the end of the 36" cable are four wire - red power, black ground, white RX into USB port, and green TX out of the USB port. The power pin provides the 5V @ 500mA direct from the USB port and the RX/TX pins are 3.3V level for interfacing with the most common 3.3V logic level chipsets.
Because of the separated pin plugs, this cable is ideal for powering and connecting up to the debug/login console on the Raspberry Pi or BeagleBone Black.
Built-in TTL COM PC-PL2303HX Chip.
Standard USB type and TTL 4 pin connector
Simple and Easy way to give USB support to your designs
Available for Linux, Mac, WinCE, and Windows (XP, 7), Win 8
Single-chip upgrade solution for Legacy RS232 devices to USB interface
USB to RS232 converters/cables/dongles
Healthcare/Medical USB Interface Data Transfer Cable
Personal Infotainment/Media Player Docking USB Interface
Cellular/PDA USB Interface Data Transfer Cable
Serial-over-IP Wireless Solution
USB Barcode/Smart Card Readers
GPS/Navigation USB Interface
Point-of-Sale (POS) Terminals/Printers
PC Docking Station/Port Replicators
Industrial/Instrumentation/Automation Control USB Interface