RS-422 is a point-to-point serial communication bus using differential signalling to achieve high data rates.

RS-422 is a point-to-point serial communication bus using differential signalling to achieve high data rates. It supports multi-drop, not multi-point as it can have one master and many slaves listening to the data.

further reading

Wikipedia article on RS-422

Texas Instruments application report SLLA070. RS-422 and RS-485 Standards Overview and System Configurations (and this collection)

National Semiconductor application note 214. Transmission Line Drivers and Receivers for TIA/EIA Standards RS-422.

Maxim tutorial 732. Selecting and Using RS-232, RS-422, and RS-485

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