LG TV Programming Cable 6FT 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 Pin-3 Transmit Data
Pin 3 Tip Pin-1 Receive Data
Pin 4 Ring Pin-2
Pin 5 Sleeve Pin-4 Ground
Pin 6
Pin 7
Pin 8
Pin 9
Shell Foil Shield
Layout of TRRS.
SLEEVE(GROUND),RING,RING,TIP
Premium Cable LG EAD-62707901