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pH ARC Sensors Modbus RTU Programmer’s Manual (EPHUM011)
624300/01 page 3 / 67
Table of Content
1 MODBUS RTU GENERAL INFORMATION ............................................................................... 4
1.1 INTRODUCTION ..................................................................................................................... 4
2 PH ARC SENSOR COMMANDS IN MODBUS RTU................................................................... 5
2.1 GENERAL ............................................................................................................................. 5
2.2 OPERATOR LEVELS AND PASSWORDS ..................................................................................... 5
2.2.1 Reading / Setting Operator Level................................................................................. 5
2.2.2 Changing Passwords for Operator Level ..................................................................... 6
2.3 CONFIGURATION OF THE SERIAL RS485 INTERFACE ................................................................. 7
2.3.1 Device Address........................................................................................................... 7
2.3.2 Baud Rate................................................................................................................... 8
2.4 CONFIGURATION OF THE ANALOG INTERFACES......................................................................... 9
2.4.1 Available Analog Interfaces......................................................................................... 9
2.4.2 Available Analog Interface Modes ............................................................................... 9
2.4.3 Description of the Analog Interfaces 1 and 2.............................................................. 10
2.4.4 Selection of an Analog Interface Mode ...................................................................... 10
2.4.5 Configuration of the 4-20 mA Interface ...................................................................... 11
2.4.6 Reading the Internally Measured Output Current....................................................... 17
2.5 MEASUREMENT................................................................................................................... 18
2.5.1 Definition of Measurement Channels and Physical Units ........................................... 18
2.5.2 Primary Measurement Channel 1 (pH) ...................................................................... 20
2.5.3 Primary Measurement Channel 6 (Temperature)....................................................... 22
2.5.4 Definition of the Measurement Status for PMC1 / PMC6............................................ 23
2.5.5 Secondary Measurement Channels 1-16................................................................... 24
2.6 CONFIGURATION OF THE MEASUREMENT ............................................................................... 26
2.6.1 Available Parameters ................................................................................................ 26
2.6.2 PA9: Moving Average................................................................................................ 27
2.6.3 PA12: Moving Average R.......................................................................................... 30
2.7 CALIBRATION...................................................................................................................... 32
2.7.1 Available Calibration Points....................................................................................... 32
2.7.2 Definitions of Calibration Points................................................................................. 33
2.7.3 Calibration Procedure................................................................................................ 35
2.7.4 Reading the Calibration Status.................................................................................. 44
2.7.5 Currently active Calibration Parameters part 1........................................................... 48
2.7.6 Currently active Calibration Parameters part 2........................................................... 48
2.7.7 Currently active Calibration Parameters part 3........................................................... 49
2.7.8 Currently active Calibration Parameters part 4........................................................... 49
2.7.9 Special Commands for Calibration with VISICAL....................................................... 50
2.7.10 Calibration Standards................................................................................................ 51
2.8 SENSOR STATUS ................................................................................................................ 57
2.8.1 Temperature Ranges ................................................................................................ 57
2.8.2 Operating Hours and Counters.................................................................................. 58
2.8.3 Warnings .................................................................................................................. 59
2.8.4 Errors........................................................................................................................ 60
2.8.5 Reading Definition of SIP and CIP............................................................................. 62
2.8.6 Reading the Sensor’s Quality Indicator...................................................................... 63
2.9 SENSOR IDENTIFICATION AND INFORMATION........................................................................... 64
2.9.1 General Information .................................................................................................. 64
2.9.2 Sensor Identification.................................................................................................. 64
2.9.3 Free User Memory Space ......................................................................................... 65
2.10 SYSTEM COMMANDS ........................................................................................................... 66
2.10.1 Recall Sensor’s Factory Settings............................................................................... 66
3 ABBREVIATIONS.................................................................................................................... 66