RS485、RS422接口设计指南.pdf

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1、前言.............................................................................................................................................01RS-485与RS-422性能指标及其标准......................................................................................02RS-485与RS-422器件及材料说明...

2、.......................................................................................13RS-485与RS-422设计原理......................................................................................................13.1基本原理.............................................................

3、........................................................13.1.1RS-485与RS-232电路的区别与优势................................................................13.1.2长短连接的判断标准、物理表现与应对措施.....................................................33.1.3RS-485与RS-422典型应用电路与选择方法......................

4、............................43.1.4485总线上处理竞争的方法..............................................................................73.2可靠性的设计.............................................................................................................83.2.1网络配置.......................

5、......................................................................................83.2.2总线匹配.............................................................................................................83.2.3引出线...............................................................

6、................................................103.2.4失效保护...........................................................................................................103.2.5地线与接地...................................................................................................

7、....113.2.5.1共模干扰问题...................................................................................113.2.5.2电磁辐射（EMI）问题：................................................................123.2.6瞬态保护...............................................................................

8、............................133.2.7其它需要注意的问题.................