Document Outline

• Vaisala Weather Transmitter WXT520 User's Guide
• Table of Contents
• Chapter 1 General Information
  • About This Manual
    • Contents of This Manual
    • General Safety Considerations
    • Feedback
  • ESD Protection
  • Recycling
  • Trademarks
  • License Agreement
  • Regulatory Compliance
  • Warranty
• Chapter 2 Product Overview
  • Weather Transmitter WXT520
    • Heating Function
    • Optional Software for Easy Settings
  • WXT520 Transmitter Components
• Chapter 3 Functional Description
  • Wind Measurement Principle
  • Precipitation Measurement Principle
  • PTU Measurement Principle
  • Heating (Optional)
• Chapter 4 Installation
  • Unpacking the Transmitter
  • Selecting the Location
  • Installation Procedure
    • Mounting
      • Mounting to Vertical Pole Mast
      • Mounting with Mounting Kit (Optional)
      • Mounting To Horizontal Cross Arm
    • Grounding the WXT520
      • Grounding Using the Bushing and Grounding Kit
      • Marine Grounding Jumper
    • Aligning WXT520
      • Compass Alignment
      • Wind Direction Offset
• Chapter 5 Wiring and Power Management
  • Power Supplies
  • Wiring Using the 8-pin M12 Connector
    • External Wiring
    • Internal Wiring
  • Wiring Using the Screw Terminals
  • Data Communication Interfaces
  • Power Management
• Chapter 6 Connection Options
  • Communication Protocols
  • Connection cables
    • Installing the Driver for the USB Cable
  • Service Cable Connection
    • Connection Through M12 Bottom Connector or Screw Terminal
  • Communication Setting Commands
    • Checking the Current Communication Settings (aXU)
    • Setting Fields
    • Changing the Communication Settings (aXU)
• Chapter 7 Getting the Data Messages
  • General Commands
    • Reset (aXZ)
    • Precipitation Counter Reset (aXZRU)
    • Precipitation Intensity Reset (aXZRI)
    • Measurement Reset (aXZM)
  • ASCII Protocol
    • Abbreviations and Units
    • Device Address (?)
    • Acknowledge Active Command (a)
    • Wind Data Message (aR1)
    • Pressure, Temperature and Humidity Data Message (aR2)
    • Precipitation Data Message (aR3)
    • Supervisor Data Message (aR5)
    • Combined Data Message (aR)
    • Composite Data Message Query (aR0)
    • Polling with CRC
    • Automatic Mode
    • Automatic Composite Data Message (aR0)
  • SDI-12 Protocol
    • Address Query Command (?)
    • Acknowledge Active Command (a)
    • Change Address Command (aAb)
    • Send Identification Command (aI)
    • Start Measurement Command (aM)
    • Start Measurement Command with CRC (aMC)
    • Start Concurrent Measurement (aC)
    • Start Concurrent Measurement with CRC (aCC)
    • Send Data Command (aD)
    • Examples of aM, aC and aD Commands
    • Continuous Measurement (aR)
    • Continuous Measurement with CRC (aRC)
    • Start Verification Command (aV)
  • NMEA 0183 V3.0 Protocol
    • Device Address (?)
    • Acknowledge Active Command (a)
    • MWV Wind Speed and Direction Query
    • XDR Transducer Measurement Query
    • TXT Text Transmission
    • Automatic Mode
    • Automatic Composite Data Message (aR0)
• Chapter 8 Sensor and Data Message Settings
  • Wind Sensor
    • Checking the Settings (aWU)
    • Setting Fields
    • Changing the Settings (aWU)
  • Pressure, Temperature, and Humidity Sensors
    • Checking the Settings (aTU)
    • Setting Fields
    • Changing the Settings (aTU)
  • Precipitation Sensor
    • Checking the Settings (aRU)
    • Setting Fields
    • Changing the Settings (aRU)
  • Supervisor Message
    • Checking the Settings (aSU)
    • Setting Fields
    • Changing the Settings (aSU)
  • Composite Data Message (aR0)
• Chapter 9 Maintenance
  • Cleaning
  • Replacing the PTU Module
  • Factory Calibration and Repair Service
  • Vaisala Service Centers
• Chapter 10 Troubleshooting
  • Self-Diagnostics
    • Error Messaging/Text Messages
    • Rain and Wind Sensor Heating Control
    • Operating Voltage Control
    • Technical Support
• Chapter 11 Technical Specifications
  • Performance
  • Inputs and Outputs
  • Operating Conditions
  • Materials
  • General
  • Options and Accessories
  • Dimensions (mm/inch)
• Appendix A Networking
  • Connecting Several WXT520s on the Same Bus
  • SDI-12 Serial Interface
    • Wiring
    • Communication Protocol
  • RS-485 Serial Interface
    • Wiring
    • Communication Protocol
    • ASCII, Polled
    • NMEA 0183 v3.0, Query
    • NMEA 0183 v3.0 Query with ASCII Query Commands
• Appendix B SDI-12 Protocol
  • SDI-12 Electrical Interface
    • SDI-12 Communications Protocol
    • SDI-12 Timing
• Appendix C CRC-16 Computation
  • Encoding the CRC as ASCII Characters
  • NMEA 0183 v3.0 Checksum Computation
• Appendix D Wind Measurement Averaging Method
• Appendix E factory configurations
  • General Unit Settings
  • Wind Configuration Settings
  • PTU Configuration Settings
  • Rain Configuration Settings
  • Supervisor Settings