I just purchased the LG 49UB8200. I noticed it has a RS232C (mini jack) connection on the back of the TV shown here:

I am wondering where i can find a cable like this for me to use on a PC.
 

Also, would anyone happen to have the codes needed in order to use this RS232 type of port?
 

I've tried calling LG tech support and even got to "Level 2 support" and they kept telling me either i am using the wrong input to my computer (they think i want to hook video from the PC to the TV) or they said its service only port and doesn't have any commands to control the TV.