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CONTENTS
1 INTRODUCTION ..................................... 2
2 ELECTRICAL INSTALLATION .............. 3
2.1 Host Computer Serial
Communications ........................... 3
2.2 OPTO22 Boards for use with
Personal Computers ..................... 3
2.3 Two-wire and Four-wire
Connection .................................... 3
2.4 Pull-up and Pull-down Resistors .. 4
2.5 Termination Resistor ..................... 4
2.6 Serial Connections ........................ 5
3 CONFIGURATION .................................. 6
3.1 Accessing the Serial
Configuration Displays .................. 6
3.2 Setting the Serial Transmission
Parameters.................................... 7
4 MODBUS PROTOCOL ........................... 8
4.1 Introduction ................................... 8
4.2 MODBUS Function Codes ............ 9
5 MODBUS FUNCTIONS ........................ 10
5.1 Read Coil Status –
Function Code 01........................ 10
5.2 Read Holding Register –
Function Code 03.........................11
5.3 Force Single Coil –
Function Code 05........................ 12
5.4 Preset Single Register –
Function Code 06........................ 13
5.5 Loopback Test –
Function Code 08........................ 14
5.6 Force Multiple Coils –
Function Code 15........................ 15
5.7 Write Multiple Registers –
Function Code 16........................ 16
6 EXCEPTION RESPONSES .................. 17
6.1 Examples .................................... 17
7 ADDRESSABLE PARAMETERS......... 18
7.1 Coils ............................................ 18
7.2 Analog Input Registers ............... 19
7.3 Single Loop Parameters
(Templates 1 and 2) .................... 19
7.4 Auto/manual Station and Analog
Backup Parameters
(Templates 3 to 6) ....................... 20
7.5 Indicator and Manual
Loader Station Parameters
(Templates 7 an 8) ...................... 20
7.6 Feedforward Parameters
(Templates 9 and 10) .................. 20
7.7 Cascade Parameters
(Templates 11 and 12) ................ 21
7.8 Cascade with
Feedforward Parameters
(Template 13) .............................. 21
7.9 Ratio Station and
Controller Parameters
(Templates 14 to 17) ................... 22
7.10 Control Monitor ........................... 22
7.11 Tuning Parameters ..................... 23
7.12 Set Point Parameters.................. 23
7.13 Alarm Parameters ....................... 24
7.14 Motorized Valve Parameters ...... 25
7.15 Basic Configuration..................... 26
7.16 Maths Blocks............................... 28
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