Rockwell-automation 1770-KF2 Data Highway or Highway Plus Interface Mo Manual de usuario Pagina 51
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Asynchronous Link Protocols
Chapter 4
4-8
Figure 4.4 shows Path 1 with unrelated parts of Figure 4.3 removed.
Paths 2, 3, and 4 could be similarly shown.
Figure 4.4
Path
1, Unrelated Parts of Figure 4.3 Removed
Transmitter
A
Receiver
B
M
S
Path 1 Path 1
11558
The full-duplex protocol is symmetrical; that is, anything that can be said
about Transmitter A, Receiver B, and Paths 1 and 2 applies equally to
Transmitter B, Receiver A, and Paths 3 and 4. There are actually two
independent instances of the protocol operating simultaneously. For
simplicity the protocol will be defined on the subsystem that carries
messages from A to B, with reference to Figure 4.5.
Figure 4.5
Message
Transmission from A to B
Transmitter
A
Receiver
B
S
M
M
S
Path 2 Path 1 Path 2 Path 1
11559
Path 1
Path 2
- Interface Module 1
- Important User Information 2
- Table of Contents 3
- Table of Contentsii 4
- Introduction 5
- Figure 1.1 7
- 1770-KF2 7
- Chapter 1 8
- Specifications 8
- Communication Concepts 13
- Figure 2.1 15
- Highway Network 15
- Figure 2.2 17
- Network Connected to V 17
- Installation 25
- Figure 3.2 28
- Figure 3.5 33
- Dimensions 33
- Chapter 3 39
- Figure 3.10 42
- Diagnostic 42
- (LED) Indicators 42
- Asynchronous Link Protocols 44
- Figure 4.1 47
- Figure 4.3 50
- Software 50
- Implementation of Data Paths 50
- Figure 4.6 52
- Protocol 52
- Environment 52
- Figure 4.7 54
- Logic for Implementing T 54
- Chapter 4 55
- Figure 4.13 62
- Message T 62
- Figure 4.14 67
- Figure 4.15 70
- Figure 4.24 78
- Message Sink Full, Case 2 78
- DLE ENQ STN BCC DLE EOT 79
- Message Packet Formats 80
- Figure 5.1 81
- Chapter 5 87
- Command Packet: 110
- Command Format: 116
- Data Encoding and Addressing 138
- Figure 6.1 139
- Numbers 139
- Figure 6.2 140
- Representation, Number 239 141
- Figure 6.3 141
- Figure 6.4 142
- Hexadecimal 142
- Figure 6.5 143
- 00100000 00000000 146
- First Byte Second Byte 146
- 00110100 00000000 151
- 00 0010100010 152
- 00 0000 0001000110 152
- Error Reporting 156
- Chapter 7 159
- Local Error Codes 164
- EXT STS byte 196
- Switch Settings 197
- Appendix A 198
- Message Formats 200
- (STS, EXT STS) 201
- Detailed Flowcharts 205
- Appendix D 206
- Data Link Layer 228
- Figure E.1 229
- Transition at Master Station 229
- Worldwide representation 235
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