Qaoquda Wpeng DB9 9 Pin Female to 3.5mm Male Plug Serial Cable VGA to 1/8 inch Conversion Cable - 6FT/1.8M

Works perfectly for accessing a QNAP, exactly as described.

Worked great with Samsung S90C--NA version.

All connections were correct re Pins 2, 3 and 5 to the tip, circle and body. Fair price compared to the US market. Product was used to Autocal my UN65KS9800, and connected to a USB to Serial adapter on my laptop, Calman Autocal went well, although I think I do a better job doing the calibration manually. Addendum: Calman improved, and so did the AutoCal results - buying 3 more of these for my other Samsung 4K TVs.

Have been using for some time now and no issues. Microsquirt adapter

I got this to control my LG C2. I didn't realize that this isn't the whole deal. I had to get the StarTech.com DB9 RS232 Serial Null Modem Adapter - DB-9 (M) to DB-9 (F). This in combination gave me a working serial connection to do commands to my TV.