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Installation
Chapter 3
3-12
must be connected to the GND of the modem or computer. Note that this
type of connection does not provide electrical isolation between the
module and the connected device.
If a connection is made between the KF2 and an RS-422-A compatible
device, you can mount the device and the module up to 4,000 cable-feet
apart.
Direct Connection to a Computer
To connect the module directly to a computer, you can construct your own
cable according to the wiring diagram in Figure 3.6.A. This cable plugs
into the COMPUTER ASYNCHRONOUS connector on the module and
the RS-232-C or RS-422-A compatible connector on the computer
(Figure 3.6.A). Connect the cable shield at one end only. Be sure that the
cable length does not exceed the RS-232-C limit of 50 feet or the
RS-422-A limit of 4,000 feet.
Figure 3.6
Connection
to a Computer
25-Pin Female Connector 25-Pin Male Connector
Cable
Asynchronous
Port Connector
of 1770-KF2
Module (RS-232-C)
A. Connection Diagram
RS-232-C or
RS-422-A
Compatible
Port Connector
of Computer
RDA
RDB
TDA
TDB
Asynchronous
Port Connector
of 1770-KF2 Module
(RS-422-A)
RS-422-A
25-Pin Female
Connector
1
14
25
16
18
4
5
6
8
20
Cable (Not
C. W
iring Diagram for RS-422-A
Exceeding 4,000 Ft.)
Note:
The connector and the pinouts for
the RS-422-A compatible computer
port will depend on the computer
manufacturer’
s standard assignment.
Other pins may have to be jumpered
on the computer connector to ensure
proper operation.
Compatible Port
Connector of
Computer
1
7
3
4
2
5
20
8
Asynchronous
Port Connector
of 1770-KF2 Module
(RS-232-C)
25-Pin Female
1
7
2
4
3
5
6
8
20 6
Cable (Not
Connector
25-Pin Male
Exceeding 50 Feet)
Signal Ground
RXD
TXD
DTR
DCD
DSR
RTS
CTS
Chassis Ground
B. W
iring Diagram for RS-232-C
11309
RS-232-C
Compatible Port
Connector of
Computer
Connector
- 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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