RS485经典资料

hoverdsp

重点介绍485接口的可靠性设计，防雷，EFT和ESD方面的设计
CHAPTER 1: OVERVIEW ........................................................................... 1
INTRODUCTION............................................................................................. 1
DATA TRANSMISSION SIGNALS ...................................................................... 1
Unbalanced Line Drivers ......................................................................... 1
Balanced Line Drivers ............................................................................. 1
Balanced 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

CHAPTER 5: SOFTWARE ....................................................................... 33
INTRODUCTION........................................................................................... 33
RS-422 SYSTEMS ....................................................................................... 33
RS-485 DRIVER CONTROL .......................................................................... 33
RS-485 RECEIVER CONTROL....................................................................... 34
MASTER-SLAVE SYSTEMS ........................................................................... 34
Four Wire Master-Slave Systems............................................................ 34
Two Wire Master-Slave Systems............................................................. 34
MULTI-MASTER RS-485 SYSTEMS .............................................................. 35
SYSTEMS WITH PORT POWERED CONVERTERS.............................................. 35
CHAPTER 6: SELECTING RS-485 DEVICES ........................................ 36
CHAPTER 7: SOURCES OF FURTHER INFORMATION.................... 37
APPENDIX A: EIA SPECIFICATION SUMMARY ................................ 38
APPENDIX B: EIA STANDARD RS-423 DATA TRANSMISSION........ 40

skydaily

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nannongyujie

[em10]

lanrf

英文的啊

njl2006

有中文的吗！