6 Foot DB9-Female to 3.5mm TRS Connector Male
Generic Serial Transfer Cable For Devices
Stereo 3.5 mm Jack.
to DB9-F Serial Port.
Primarily used to transfer Serial Data back and forth from Small devices.

Use included Null M-F adapter to Reverse Pins 2 and 3.
Wiring Schematic
Includes two Items:
87060
01321
DB9 TRS Connector 3.5mm (With Null Adapter)
Pin 1-6-7-8
Pin 2 Ring - Right
Pin 3 Tip - Left
Pin 4
Pin 5 Sleeve - Shield - Ground
Pin 9
Shell Sleeve - Shield - Ground