Ok, I just probed my tuning cable, that pinout above is wrong.  Here's what I get: Pin 1 = USB GND Pin 2 = N/C Pin 3 = D+ Pin 4 = D- Pin 5 = VCC Pin 6 = Shield (the metal case on the USB plug)   Also be careful where you get your pinout from as I noticed when looking up the USB pinout on google many images have the D-/D+ swapped over.  My numbering above is based on the pinout below that I have marked "correct".