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Learn RS-485 design basics

Posted: 11 Aug 2008     Print Version  Bookmark and Share

Keywords:RS-485  transmission standard  interface design  transmission lines 

Ratified in the early 1980s as a new balanced transmission standard, RS-485 has emerged as the industry's seemingly eternal interface workhorse. Since then, much literature has been written on the subject, overwhelming system engineers who are rarely confronted with interface design. This article serves as an introductory guide to designers new to RS-485 by discussing the main aspects of the standard.

RS-485 only defines the electrical characteristics of drivers and receivers used in balanced multi-point transmission lines. As an electrical-only standard, RS-485 is commonly referenced by higher level standards as their physical layer.

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