Samsung UE55F9080 Serial configuration

Hi all,

I just got a Samsung UE55F9080 and I would like to control it via serial. I connected an iTach Flex to the service port on the samsung “input box” using the recommended cable but I am getting no response from the TV. Could someone please confirm the required iTach serial port settings? Also, should I use the service port on the external box or the one directly on the TV?

Thanks for any help I can get!