DB9 Female to 3.5mm TRRS Serial Cable 6FT LG EAD-62707901

LG TV Programming Cable 6FTt DB9-Female to 3.5mm TRRS Connector Male

Serial Transfer Communication Devices to Program LG TVs
TRRS 3.5 mm Jack.
DB9-F Serial Port.

Wiring Schematic

DB9-F         TRRS Connector 3.5mm           Signal 
Pin 1   
Pin 2         Ring 1                        Transmit Data
Pin 3         Tip                           Recieve Data 
Pin 4         Ring 2
Pin 5         Sleeve                        Ground 
Pin 6
Pin 7
Pin 8
Pin 9
Shell                                      Foil Sheild        

Layout of TRRS.
TIP-RING1-RING2-SLEEVE