Transcription of One Technology Way - Analog Devices
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One Technology Way - Analog Devices
AN-960 APPLICATION NOTEOne Technology Way P. O . Box 9106 Norwood, MA 02062-9106, Te l : Fax: RS-485/RS-422 Circuit Implementation Guide by Hein Marais Rev. 0 | Page 1 of 12 INTRODUCTION Industrial and instrumentation applications (I&I) require transmission of data between multiple systems often over very long distances. The RS-485 bus standard is one of the most widely used physical layer bus designs in I&I applica-tions. The key features of RS-485 that make it ideal for use in I&I communications applications are Long distance links up to 4000 feet. Bidirectional communications possible over a single pair of twisted cables. Differential transmission increases noise immunity and decreases noise emissions. Multiple drivers and receivers can be connected on the same bus. Wide common-mode range allows for differences in ground potential between the driver and receiver.
For reliable RS-485 and RS-422 communications, it is essential that the reflections in the transmission line be kept as small as possible. This …
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