Calrads ( RS232 ) DB9 Female Serial Port to 3.5mm Male Stereo Cable is primarily designed used to transfer Serial Data bi-bidirectionally between TV displays and home automation systems, Legacy pronto hardware. Works with Sony, Marantz, Samsung and various other manufactures that require serial control from a 3.5 mm jack.

Wired: 

3.5 mm Tip=DB9 Female pin 2

3.5 mm Ring=DB9 Female pin 3

3.5 mm Sleeve=DB9 Female pin 5

Specifications

( RS232 ) Port DB-9 Female Serial to 3.5mm Male Stereo Interface Cable

Generic Serial Transfer Cable For Devices

Stereo 3.5mm Jack to ( RS232 ) DB9 Female Serial Port

Note: Not used for Audio Signals