RS-422 Interface.

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Operational Amplifier

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Presentation transcript:

RS-422 Interface

RS-422 Like RS-485, RS-422 is a differential signaling standard which defines the electrical characteristics of drivers and receivers used to implement a balanced transmission line. Unlike RS-485, RS-422 is a multi-drop standard, rather than multi-point, allowing only one driver and up to ten receivers to be connected to the bus. Any RS-485 compliant transceiver is compatible with an RS-422 application, though it may not be strictly compliant with the RS-422 standard.

Comparison of RS-485 and RS-422 Bus topology Multi-drop Multi-point Number of Drivers 1 Many Number of Receivers 10 Minimum 32, up to 256 Differential Output Voltage 2V across 100Ω 1.5V across 54Ω Driver Output Common-Mode Range Unspecified -7V to +12V Driver Short Circuit Current1 150µA 250µA Minimum Receiver Input Impedance 4kΩ 12kΩ Receiver Input Common-Mode Range -7V to +7V In RS-422, IOS is not specified over common mode. No transient overvoltage spec in 422. 1 In RS-422, driver short circuit current is specified from each A and B output to ground. In RS-485, driver short circuit current is specified from A to B, B to A, and from each A and B output to -7V to +12V.