DB9 Female to 3.5mm TRS Serial Cable 6 Feet

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.


Wiring Schematic

DB9-F         TRS Connector 3.5mm           Signal 
Pin 1-6-7-8   
Pin 2         Tip  - Left                   Recieve Data
Pin 3         Ring - Right                  Transmit Data 
Pin 4       
Pin 5         Sleeve - Shield               Ground 
Pin 9
Shell         Sleeve - Shield               Ground

Some Compatible Part Numbers.
Exlink Spec
Commonly Called an Exlink Cable.