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RS-422/485 Application Note Table of Contents i
Copyright B&B Electronics -- Revised October 1997
B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350
PH (815) 433-5100 -- FAX (815) 434-7094
Table of Contents
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 ≠ 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
- RS-422 and RS-485 1
- Application Note 1
- Table of Contents 2
- Chapter 1: Overview 4
- 2 RS-422/485 Application Note 5
- Figure 1.1 5
- Figure 1.2 5
- 4 RS-422/485 Application Note 7
- Figure 1.3 7
- Figure 1.4 7
- RS-422/485 Application Note 5 8
- Figure 1.5 8
- RS-422/485 Application Note 7 10
- Figure 1.6 10
- 8 RS-422/485 Application Note 11
- Figure 1.7 11
- Figure 1.8 13
- Figure 1.9 15
- Two Wire or Four Wire Systems 16
- Network Topologies 16
- Termination 19
- Biasing an RS-485 Network 20
- Bias Resistor 21
- Extending the Specification 22
- Number of Conductors 23
- Shielding 23
- Cable Characteristics 23
- What does a surge look like? 26
- Ground Differences 29
- Ground line 30
- Shunting Device 33
- Earth Ground 34
- Signal Ground 34
- Data Lines 34
- 125 mA Fuse 34
- Optical Isolation Shunting 35
- Chapter 5: Software 36
- Introduction 36
- RS-422 Systems 36
- RS-485 Driver Control 36
- RS-485 Receiver Control 37
- Master-Slave Systems 37
- Multi-Master RS-485 Systems 38
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