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上传时间: 2008-09-03
详细说明： 关于485通讯可靠性设计的经典资料 目录如下: CHAPTER 1: OVERVIEW ........................................................................... 1 INTRODUCTION............................................................................................. 1 DATA TRANSMISSION SIGNALS ...................................................................... 1 Unbalanced Line Drivers ......................................................................... 1 Balanced Line Drivers ............................................................................. 1 Bal anced Line Receivers.......................................................................... 3 EIA STANDARD RS-422 DATA TRANSMISSION .............................................. 3 EIA STANDARD RS-485 DATA TRANSMISSION .............................................. 6 TRISTATE CONTROL OF AN RS-485 DEVICE USING RTS.................................. 9 SEND DATA CONTROL OF AN RS-485 DEVICE .............................................. 11 CHAPTER 2: SYSTEM CONFIGURATION ............................................ 13 NETWORK TOPOLOGIES............................................................................... 13 TWO WIRE OR FOUR WIRE SYSTEMS............................................................ 13 TERMINATION............................................................................................. 16 BIASING AN RS-485 NETWORK.................................................................... 17 EXTENDING THE SPECIFICATION .................................................................. 19 CHAPTER 3: SELECTING RS-422 AND RS-485 CABLING .................. 20 NUMBER OF CONDUCTORS .......................................................................... 20 SHIELDING ................................................................................................. 20 CABLE CHARACTERISTICS ........................................................................... 20 CHAPTER 4: TRANSIENT PROTECTION OF RS-422 AND RS-485 SYSTEMS.................................................................................................... 23 WHAT DOES A SURGE LOOK LIKE? ................................................................ 23 Surge Specifications............................................................................... 23 Common Mode vs. Differential Mode..................................................... 25 GROUND ¹ GROUND.................................................................................... 26 TRANSIENT PROTECTION USING ISOLATION .................................................. 27 Isolation Theory..................................................................................... 27 Isolation Devices ................................................................................... 28 TRANSIENT PROTECTION USING SHUNTING .................................................. 28 Shunting Theory..................................................................................... 28 Connecting Signal Grounds ................................................................... 29 Shunting Devices ................................................................................... 29 COMBINING ISOLATION AND SHUNTING ....................................................... 29 SPECIAL CONSIDERATION FOR FAULT CONDITIONS....................................... 31 CHOOSING THE RIGHT PROTECTION FOR YOUR SYSTEM ................................. 31 ...展开收缩
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