Vaisala WXT520 Uživatelská příručka Strana 159
- Strana / 171
- Tabulka s obsahem
- ŘEŠENÍ PROBLÉMŮ
- KNIHY
Hodnocené. / 5. Na základě hodnocení zákazníků
Appendix B __________________________________________________________ SDI-12 Protocol
VAISALA______________________________________________________________________ 157
APPENDIX B
SDI-12 PROTOCOL
SDI-12 is a standard for interfacing data recorders with microprocessor-
based sensors. The name stands for serial/digital interface at 1200 baud.
More information of the complete SDI-12 standard text is available
from the SDI-12 web-site in the following address: www.sdi-12.org.
SDI-12 Electrical Interface
The SDI-12 electrical interface uses the SDI-12 bus to transmit serial
data between SDI-12 data recorders and sensors. The SDI-12 bus is the
cable that connects multiple SDI-12 devices. This is a cable with three
conductors:
- a serial data line,
- a ground line, and
- a 12-volt line.
The SDI-12 bus can have at least 10 sensors connected to it. The bus
topology is a parallel connection, where each of the three wires of
different sensors are connected in parallel.
- USER'S GUIDE 1
- Table of Contents 3
- CHAPTER 8 5
- CHAPTER 9 5
- APPENDIX E 7
- List of Figures 9
- List of Tables 11
- GENERAL INFORMATION 13
- General Safety Considerations 14
- Trademarks 16
- License Agreement 16
- Regulatory Compliance 16
- Warranty 17
- PRODUCT OVERVIEW 19
- Heating Function 20
- WXT520 Transmitter Components 21
- 0803-028 22
- 0505-193 24
- 0804-022 24
- 0806-001 26
- 0.5 L 1 t 28
- PTU Measurement Principle 31
- Heating (Optional) 31
- 0806-010 32
- Selecting the Location 34
- 0712-009 35
- 0803-030 37
- 0803-032 39
- Grounding the WXT520 40
- Marine Grounding Jumper 41
- 0803-048 42
- Wind Direction Offset 44
- WIRING AND POWER MANAGEMENT 45
- 0805-023 46
- External Wiring 48
- Internal Wiring 49
- 0803-035 50
- Data Communication Interfaces 52
- Power Management 53
- CONNECTION OPTIONS 57
- Connection cables 58
- Service Cable Connection 60
- Connector or Screw Terminal 61
- Checking the Current 62
- Communication Settings (aXU) 62
- Changing the Communication 65
- Settings (aXU) 65
- GETTING THE DATA MESSAGES 67
- General Commands 68
- Reset (aXZ) 68
- Precipitation Counter Reset 69
- Measurement Reset (aXZM) 71
- ASCII Protocol 72
- Abbreviations and Units 72
- Device Address (?) 73
- Wind Data Message (aR1) 74
- Pressure, Temperature and 75
- Humidity Data Message (aR2) 75
- Supervisor Data Message (aR5) 77
- Combined Data Message (aR) 78
- Composite Data Message Query 78
- Polling with CRC 79
- SDI-12 Protocol 82
- Address Query Command (?) 83
- Change Address Command (aAb) 84
- CRC (aMC) 87
- CRC (aCC) 88
- Send Data Command (aD) 89
- Examples of aM, aC and aD 90
- Commands 90
- Continuous Measurement (aR) 92
- NMEA 0183 V3.0 Protocol 95
- MWV Wind Speed and Direction 96
- XDR Transducer Measurement 98
- TXT Text Transmission 106
- Automatic Mode 108
- Automatic Composite Data 108
- Message (aR0) 108
- SENSOR AND DATA MESSAGE 109
- SETTINGS 109
- Setting Fields 111
- Changing the Settings (aWU) 113
- Checking the Settings (aTU) 115
- Changing the Settings (aTU) 117
- Precipitation Sensor 119
- Checking the Settings (aRU) 119
- Changing the Settings (aRU) 123
- Supervisor Message 125
- Checking the Settings (aSU) 125
- Changing the Settings (aSU) 127
- Composite Data Message (aR0) 129
- 0R0<cr><lf> 130
- MAINTENANCE 131
- Replacing the PTU Module 132
- Vaisala Service Centers 133
- TROUBLESHOOTING 135
- Self-Diagnostics 137
- Error Messaging/Text Messages 137
- Rain and Wind Sensor Heating 139
- Operating Voltage Control 139
- Technical Support 139
- TECHNICAL SPECIFICATIONS 141
- Tab le 14 Wi nd 142
- Table 15 Relative Humidity 143
- Table 16 Precipitation 143
- Inputs and Outputs 144
- Operating Conditions 145
- Materials 146
- Options and Accessories 147
- Dimensions (mm/inch) 148
- 0805-013 149
- 0505-211 150
- Communication Protocol 152
- RS-485 Serial Interface 153
- ASCII, Polled 153
- NMEA 0183 v3.0, Query 154
- Query Commands 156
- SDI-12 PROTOCOL 159
- SDI-12 Timing 161
- CRC-16 COMPUTATION 163
- WIND MEASUREMENT AVERAGING 165
- 0505-215 166
- General Unit Settings 168
- Wind Configuration Settings 168
- PTU Configuration Settings 169
- Rain Configuration Settings 169
- Supervisor Settings 169
- *M210906EN* 171
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