On the connector I have that is wired to only be a charger.
*Pins 1,4,5,28 are tied to ground
*Pins 2 and 3 are shorted 0 these are the usb D+ D- (I think this is to prevent esd? or there could be some signaling with shorting the pins)
*Pin 7 and 9 are linked to supply +5v, pin 9 triggers...