This is the best solution for those who don't have com port on PC.
I haven`t seen any usb to 3.5 jack exlink cable...
samygo wiki wrote:The Ex-Link (serial) cable
Solder yourself ( or buy ) an Ex-Link serial cable to connect to your Samsung TV.
Example online shop which sell such ex-link cable and serial to usb cable. Usb-serial adapter better to buy some cheaper version.