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Appendix A _________________________________________________________ Modbus Reference
VAISALA _______________________________________________________________________ 171
APPENDIX A
MODBUS REFERENCE
This appendix describes the Modbus functions and data of the
transmitter.
Function Codes
MMT330 supports all Modbus conformance class 0 and class 1 function
codes defined in Open Modbus/TCP Specification, Release 1.0.
Table 34 Supported Function Codes
Function Code
Name
Notes
01 (0x01)
Read Coils
Class 1
02 (0x02)
Read Discrete Inputs
Class 1
03 (0x03)
Read Holding Registers
Class 0
04 (0x04)
Read Input Registers
Class 1
05 (0x05)
Write Single Coil
Class 1
06 (0x06)
Write Single Register
Class 1
07 (0x07)
Read Exception Status
Class 1
08 (0x08)
Diagnostics
15 (0x0F)
Write Multiple Coils
Class 2
16 (0x10)
Write Multiple Registers
Class 0
22 (0x16)
Mask Write Register
Class 2
23 (0x17)
Read/Write Multiple Registers
Class 2
43 / 14 (0x2B / 0x0E)
Read Device Identification
Class 0 function codes are enough to access all measurement data and
configuration settings of the MMT330 transmitter. In addition, all class 1
and some class 2 commands are also supported giving better
compatibility and allowing more efficient communication when needed.
Modbus diagnostic and device identification data can be read out only
with the function codes dedicated for those purposes (08 and 43 / 14).
- USER'S GUIDE 1
- Table of Contents 3
- CHAPTER 4 4
- CHAPTER 6 6
- CHAPTER 7 7
- CHAPTER 8 7
- CHAPTER 9 7
- APPENDIX A 8
- List of Figures 9
- List of Tables 11
- GENERAL INFORMATION 13
- Version Information 14
- Documentation Conventions 14
- ESD Protection 15
- Recycling 16
- Regulatory Compliances 16
- DNV Type Approval 17
- Patent Notice 19
- Trademarks 19
- Software License 19
- Warranty 19
- PRODUCT OVERVIEW 21
- Basic Features and Options 22
- Structure of the Transmitter 22
- 0604-006 23
- Probe Options 24
- Typical Applications 25
- Transformer Oil 26
- 0510-029 27
- INSTALLATION 29
- 59 (2.32) 30
- Thickness 30
- 9.5 (0.37) 30
- 133 (5.24) 30
- Pole or Pipeline 31
- 0503-007 32
- 0503-041 32
- 0509-051 33
- 0503-008 33
- Panel Mounting Frame 34
- Cable Bushings 35
- Grounding the Cables 36
- WARNING 38
- CAUTION 40
- 0510-030 41
- 0509-144 42
- 0509-150 42
- 0510-028 44
- Tightening the Clasp Nut 45
- 0507-043 47
- Sampling Cell for MMT338 49
- Optional Modules 50
- Installation 51
- Warnings 52
- Third Analog Output 55
- Installation and Wiring 56
- RS-422/485 Interface 58
- Figure 34 4-Wire RS-485 Bus 61
- 1102-027 62
- LAN Interface 63
- WLAN Interface 64
- Data Logger Module 65
- 0706-068 66
- 8-Pin Connector 67
- OPERATION 69
- Graphic History 70
- 0706-030 71
- Menus and Navigation 72
- Changing the Language 73
- Rounding Setting 73
- Display Backlight Setting 73
- Display Contrast Setting 74
- Keypad Lock (Keyguard) 74
- Menu PIN Lock 75
- Factory Settings 75
- Display Alarms 76
- Configuring a Display Alarm 77
- Table 13 ALSEL Parameters 79
- Serial Line Communication 81
- User Port Connection 82
- Service Port Connection 83
- LAN Communication 84
- IP Configuration 85
- Wireless LAN Configuration 88
- Communication Protocol 91
- Terminal Program Settings 92
- 0810-070 93
- 0810-071 94
- List of Serial Commands 95
- Serial Line 97
- Outputting Reading Once 98
- FTIME and FDATE 100
- General Settings 101
- Using Serial Line 102
- Date and Time 104
- Data Filtering 105
- Device Information 106
- Serial Output Settings 110
- Data Recording 113
- View Recorded Data 114
- Deleting the Recorded Files 117
- Analog Output Settings 118
- Analog Output Quantities 119
- AMODE/ASEL 120
- Analog Output Tests 121
- Operation of Relays 123
- 1102-007 124
- Hysteresis 125
- 1102-040 126
- Enabling/Disabling Relays 127
- Setting Relay Outputs 127
- 0509-142 128
- Testing Operation of Relays 131
- CHAPTER 5 133
- Taking Modbus into Use 134
- Enabling Serial Modbus 135
- Enabling Ethernet Modbus 136
- 1101-034 137
- 1101-036 137
- Diagnostic Modbus Counters 139
- Disabling Modbus 140
- 10xawppm = 141
- (A/(T+273.16)+B) 141
- (B+A/T) 143
- A/T1 - 1TPPMLOGB 144
- MAINTENANCE 145
- Changing the Sensor 146
- Error States 147
- Table 30 Error Messages 148
- Technical Support 149
- Product Returns 149
- CALIBRATION AND ADJUSTMENT 151
- Cleaning the Sensor 152
- Relative Humidity Adjustment 153
- Using Display/Keypad 154
- Temperature Adjustment 157
- Analog Output Adjustment 159
- TECHNICAL DATA 161
- Operating Environment 162
- Probe Specifications 162
- Inputs and Outputs 163
- Mechanics 163
- Modules 164
- Relay Module 165
- RS-485 Module 165
- LAN Interface Module 165
- WLAN Interface Module 165
- Spare Parts and Accessories 166
- CABLE BUSHINGS 167
- WINDOWS SOFTWARE 167
- Dimensions (mm/inch) 168
- 92 (3.62) 169
- 116 (4.57) 169
- 183 (7.20) 169
- 0509-149 170
- 0509-146 170
- MMT338 171
- MODBUS REFERENCE 173
- Register Map 174
- 16-Bit Integer Format 175
- Measurement Data (Read-Only) 176
- Status Registers (Read-Only) 176
- Exception Status Outputs 177
- Diagnostic Sub-Functions 178
- Exception Responses 179
- *M210733EN* 181
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