Rockwell-automation 1770-KF2 Data Highway or Highway Plus Interface Mo Instrukcja Użytkownika Strona 41
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- Spis treści
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Oceniono. / 5. Na podstawie oceny klientów
Installation
Chapter 3
3-17
After detecting DCD, the module continues to monitor the DCD line. If
DCD goes off, the module restarts the timeout. If DCD is not restored
within the timeout, the module initiates the hang-up sequence. This
feature allows the remote station to redial in the event that the connection
is lost through a fault in the phone network.
This handshaking is necessary to guarantee access to the phone line. If
this handshaking protocol is defeated by improper selection of modem
options or by jumpers at the connectors, the modem may still answer a
call. But if the connection is lost, the modem will not hang up. It will
then be impossible for the remote station to reestablish the connection
because it will get a busy signal.
Character Transmission
The module sends data serially over the asynchronous interface, one 8-bit
byte at a time. The transmission format conforms to ANSI X3.16,
CCITT V.4, and ISO 1177, with the exception that the parity bit is
retained while the data length is extended to eight bits.
The transmission format may be summarized as follows:
start bit
data bit 0
data bit 1
data bit 2
data bit 3
data bit 4
data bit 5
data bit 6
data bit 7
even parity bit (optional)
one stop bit
For communication rate see “Asynchronous Communication Rate and
Diagnostic Commands” and for parity settings refer to “Asynchronous
Link Features.”
- 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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