Ex-Link Cable for J/K/M/Q/N/QN Series
Wired ExLink cable
On some J/K-series TV, Ex-Link port is located on the separate 3.5mm jack labelled as "EX-LINK".
In this case, you need to make Ex-link cable by connecting JACK male to the USB-COM adapter(not TTL/LVTTL) as shown below.
Or you can use regular COM port, if your PC have it, but in this case you have to connect pins in reverse order (from left to right) as shown below. You need 2, 3 and 5 pin.
Start the terminal
On a Linux PC, install 'cu' (call up) tool from the uucp package and run
cu -l /dev/ttyUSB0 -s 115200