Rockwell-automation 1770-KF2 Data Highway or Highway Plus Interface Mo Manual de usuario Pagina 79
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Valorado. / 5. Basado en revisión del cliente
Asynchronous Link Protocols
Chapter 4
4-36
station alone may not work, since it could be that the only way to free up
space is to send a message to the master.
Line Monitoring
When monitoring half-duplex protocol in two-wire mode, you need to
monitor only one line. The example below shows a message sent by the
master and a reply sent by the slave in answer to a poll. Slave responses
are in boldface.
Message from Master to Slave:
DLE SOH STN DLE STX message DLE ETX BCC DLE ACK
Message Sent from Slave to Master in Response to Poll:
DLE ENQ STN BCC DLE STX message DLE ETX BCC DLE ACK
Poll with a DLE EOT in Response:
DLE ENQ STN BCC DLE EOT
- 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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