DB9 Female To DC 3.5 mm Cable6feet DB9 Female to 3.5 mm Serial CableDB9Pin Serial Transfer Cable For DevicesStereo 3.5 mm Jack to DB9 Pin Female Serial Port. Primarily used to transfer Serial Data back and forth from Small devices.
Wiring Schematic: DB9 TRS Connector / Audio DC 3.5 mmPin 1-6-7-8 openPin 2 Tip - LeftPin 3 Ring - RightPin 4 openPin 5 Shield - GroundPin 9 open