Table of Contents
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CONTENTS
Section
1
INTRODUCTION ......................................................... 2
2
PREPARATION ........................................................... 2
2.1
Company Standard Settings ............................ 2
3
INSTALLATION ........................................................... 3
3.1
Adaptors for Personal Computers ................... 3
3.1.1
Five-wire Configuration ...................... 3
3.1.2
Three-wire Configuration .................... 3
4
ELECTRICAL CONNECTIONS .................................. 3
4.1
Serial Connections ........................................... 3
4.1.1
Five-wire Cable ................................... 3
4.1.2
Three-wire Cable ................................ 3
5
SETTING UP ............................................................... 5
5.1
Termination Resistors ....................................... 5
6
PROGRAMMING ......................................................... 6
6.1
Serial Interface Page ........................................ 6
7
MODBUS PROTOCOL ............................................... 7
7.1
Introduction to MODBUS Protocol ................... 7
7.2
MODBUS Function Codes ............................... 7
8
MODBUS FUNCTIONS ............................................... 8
8.1
Read Coil Status .............................................. 8
8.1.1
Read Coil Status Query ...................... 8
8.1.2
Read Coil Status Response ............... 8
8.2
Read Holding Register ..................................... 8
8.2.1
Read Holding Register Query ............ 8
8.2.2
Read Holding Register Response ...... 9
8.3
Force Single Coil .............................................. 9
8.3.1
Force Single Coil Query ..................... 9
8.3.2
Force Single Coil Response ............... 9
8.4
Preset Single Register ................................... 10
8.4.1
Preset Single Register Query ........... 10
8.4.2
Preset Single Register Response .... 10
8.5
Loopback Test ................................................ 10
8.5.1
Loopback Test Query ........................ 10
8.5.2
Loopback Test Response ................. 10
8.6
Preset Multiple Registers ............................... 11
8.6.1
Preset Multiple Registers Query ...... 11
8.6.2
Page
Section
9
EXCEPTION RESPONSES ...................................... 12
9.1
Examples ........................................................ 12
10
MODBUS COILS AND REGISTERS ........................ 13
10.1
Model 8241/185 .............................................. 13
10.1.1 Coils .................................................. 13
10.1.2 Holding Registers ............................. 14
10.2
Model 8241/195 .............................................. 16
10.2.1 Coils .................................................. 16
10.2.2 Holding Registers ............................. 16
10.3
Model 8242/185 .............................................. 17
10.3.1 Coils .................................................. 17
10.3.2 Holding Registers ............................. 18
10.4
Model 8242/195 .............................................. 20
10.4.1 Coils .................................................. 20
10.4.2 Holding Registers ............................. 20
11 OPERATION ............................................................... 21
12 SPECIFICATION ........................................................ 23
APPENDICES .................................................................... 23
Non-volatile Memory Limitations .................... 23
Page
1
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