[edit] USB signaling Pin numbers (looking at socket): Pin assignments[1] Pin Function 1 VBUS (4.75–5.25 volts) 2 D− 3 D+ 4 GND Shell Shield USB signals are transmitted on a twisted pair of data cables, labelled D+ and D−. These collectively use half-duplex differential signaling to combat the effects of electromagnetic noise on longer lines. D+ and D− usually operate together; they are not separ..
