This adapter is ideal for use with computers, projectors, and any control unit/display requiring 3-conductor RS-232 serial control.The Velocity RS-232 adapter leverages your DB9 or 3.5mm stereo audio cable to run 3-conductor RS-232 control signals between your control unit and your video display. 1.5m DB9 Female to 3.5mm Serial Cable. Generic Serial Transfer Cable For Devices. Stereo 3.5 mm Jack to DB9 Pin Female Serial Port. Connector: Audio Stereo DC3.5 mm Jack to DB9 Female Serial Port. Fully shielded to prevent unwanted EMI/RFI interference. Primarily used to transfer Serial Data back and forth from Small devices. Wiring Schematic: DB9 TRS Connector / Audio DC3.5mm Pin 1-6-7-8 open Pin 2 Tip - Left Pin 3 Ring - Right Pin 4 open Pin 5 Shield - Ground Pin 9 open Package Includes: 1 X 9Pin RS232 DB9 Female to 3.5mm Male Jack Plug Adapter Serial Data Converter Cable