USB pinout, wiring and how it works! - Electroschematics USB – How it Works. The data is transferred through the D+ and D- connectors while Vbus and Gnd connectors provide power to the USB device. USB A Wiring USB Connector Pinouts - hobbytronics USB Connector Pinouts. USB is a serial bus. It uses 4 shielded wires: two for power (+5v & GND) and two for differential data signals (labelled as D+ and D- in pinout).