I am trying to set up my 718 with a Signalink and WSJT-X on my macbook. See attached but it keeps erroring on rig control. As you can see, it is receiving just fine. I have the right 13 pin cable plugged into the radio, the USB connected to the macbook. Also, I am unclear on the "PWR" wire on the Signalink USB. The instructions show a wire going to pin 5 but the instructions say that is not needed on the USB. So I left it off. I am stuck.. Advice, please?