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RS-422/485 Application Note

Table of content

 

Chapter 1: Overview

   Introduction
  
Data Transmission Signals
     
Unbalanced Line Drivers
     
Balanced Line Drivers
     
Balanced Line Receivers
  
EIA Standard RS-422 Data Transmission
  
EIA Standard RS-485 Data Transmission
  
Tristate Control of an RS-485 Device Using RTS
  
Send Data Control of an RS-485 Device

 

Chapter 2: System Configuration

   Network Topologies
  
Two Wire or Four Wire Systems
  
Termination
  
Biasing and RS-485 Network
  
Extending the Specification
 

Chapter 3: Selecting RS-422 and RS-485 Cabling

   Number of Conductors
  
Shielding
  
Cable Characteristics

 

Chapter 4: Transient Protection of RS-422 and RS-484 Systems

   What Does a Surge Look Like?
     
Surge Specifications
     
Common Mode vs. Differential Mode
  
Ground is not equal to Ground
  
Transient Protection Using Isolation
     
Isolation Theory
     
Isolation Devices
  
Transient Protection Using Shunting
     
Shunting Theory
     
Connecting Signal Grounds
     
Shunting Devices
  
Combining Isolation and Shunting
  
Special Consideration for Fault Conditions
  
Choosing the Right Protection For Your System

 

Chapter 5: Software

   Introduction
  
RS-422 Systems
  
RS-485 Driver Control
  
RS-485 Receiver Control
  
Master-Slave Systems
     
Four Wire Master-Slave Systems
     
Two Wire Master-Slave Systems
  
Multi-Master RS-485 Systems
  
Systems with Port Powered Converters
 

Chapter 6: Selecting RS-485 Devices

Chapter 7: Sources of Further Information

Appendix A: EIA Specification Summary

Appendix B: EIA Standard RS-423 Data Transmission

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