# Universal Serial Bus (USB)

Developed by Compaq, Hewlett-Packard, Intel, Lucent, Microsoft, NEC and Phillips.

USB A (at the Connector)
USB B (at the Connector)

Series "A" plugs are used towards the host system and series "B" plugs are used towards the USB device.

Pin | Name | Description
--- | --- | ---
1 | VBUS | +5 VDC
2 | D- | Data -
3 | D+ | Data +
4 | GND | Ground

Contributor: | Joakim Ögren, Tomas Ögren

Source: | USB FAQ at USB Implementers Forum
| USB Specification v2.0 at USB Implementers Forum

Copyright © The Hardware Book Team 1996-2004.
May be copied and redistributed, partially or in whole, as appropriate.
Document last modified: 2002-01-13