Vaisala WXT520 User's Guide download pdf (Page 19)

Chapter 2 __________________________________________________________ Product Overview

VAISALA_______________________________________________________________________ 17

CHAPTER 2

PRODUCT OVERVIEW

This chapter introduces the unique features and advantages of the

Vaisala Weather Transmitter WXT520.

Weather Transmitter WXT520

0504-066

Figure 1 Vaisala Weather Transmitter WXT520

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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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