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Pinout is a term used in electronics to describe how a connector is wired. Each pin of the connector has a purpose which is briefly described in the pinout. The pinout can be shown as a simple table or may include a diagram. It is important to make it clear how to view the diagram, saying if it shows you the backside of the connector (where you attach wires to it) or the "mating face" of the connector. Published pinouts are particularly important when different manufacturers want to interconnect their products using open standards.Here is a good example, showing the mating face of the USB connector found on all modern PCs:
1 +5V
2 -Data
3 +Data
4 GND
Links
Handbook of pinouts for computer hardware, cables, adapters, slots, cellular phones and other devices
Chan's pinout page
