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RS-422/485 Application Note
7
Copyright B&B Electronics -
- Revised October 1997
B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350
PH (815) 433-5100 -- FAX (815) 434-7094
Figure 1.6
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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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