RS485与 232 笔记

yzl963

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
【文件名】:07127@52RD_RS485 232 note.pdf
【格　式】:pdf
【大　小】:417K
【简　介】:
【目　录】:

yzl963

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
【文件名】:07127@52RD_RS485 232 note.pdf
【格　式】:pdf
【大　小】:417K
【简　介】:
【目　录】: