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Source: focus.ti.com
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Fri May 04, 2012 08:17:56 PM
Short Desciption:
The RS-422 and RS-485 standards, as they are known today, are balanced data-transmission schemes that offer robust solutions for transmitting data over long distances and noisy environments. The official titles for these two standards are ANSI TIA/EIA-422 and TIA/EIA-485, respectively, and are revised periodically by the TR-30.2 DTE-DCE Interfaces and Protocols Subcommittee to the Telecommunications Industry Association (TIA) TR-30 Data Transmission Systems and Equipment Committee. For identification, RS-422 and RS-485 suffice.
Summary:
Overview of RS-422 and RS-485 Standards, Selected RS-422 Electrical Specifications, ABSTRACT ANSI TIA/EIA-422 and TIA/EIA-485 standards, commonly known as RS-422 and RS-485, respectively,
specify balanced data-transmission schemes for transmitting data over long distances in noisy environments. These standards are compared, and their basic differences and similarities are discussed. Techniques for impedance matching to minimize line reflections in several applications are presented, with laboratory test results.
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"RS-422 and RS-485 Standards Overview and System Configurations"
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