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User’s Guide ______________________________________________________________________
134 _________________________________________________________________ M210906EN-C
Table 10 Communication Problems
Problem Possible causes Action(s)
No response to any commands. Wrong wiring or operation
voltage not connected.
Baud rate/start bits/parity/stop bit
settings do not match between
the device and the host.
Check the wiring and operation
voltage, see Chapter 5, Wiring
and Power Management, on
page 43.
Connect the service cable, use
the communication settings
19200,8 N,1. Check the serial
port settings of the device with
Configuration Tool or with
terminal program. Use command
aXU! (SDI-12) or aXU<cr><lf>
(ASCII/NMEA). Change the
values if needed. A software/
hardware reset is needed to
validate the changes.
When you have no service
cable, try typing address query
commands ?! and ?<cr><lf>
with different serial settings in
terminal program. When the
communication parameters
match, the device responds with
its address. The settings can
now be changed using aXU!
(SDI-12) or aXU<cr><lf> (ASCII/
NMEA) commands. A software/
hardware reset is needed to
validate the changes.
Incorrect <cr><lf> settings in the
terminal program.
In ASCII and NMEA protocols
both <cr> and <lf> are required
after each command. Check that
your terminal program sends
both when pressing enter.
Connection works but data
messages not available.
Wrong device address in a SDI-
12 command or a mistyped SDI-
12 command (in SDI-12 a
mistyped command is in no way
responded).
A command mistyped in ASCII/
NMEA mode while error
messaging/text messages is
disabled (aSU,S=N).
Request the device address with
?! command and then retype the
command now with the correct
address. Check the data query
commands from Chapter 7,
Getting the Data Messages, on
page 65.
Enable the error messaging
using the Vaisala Configuration
Tool or any terminal by setting
aSU,S=Y, then try the command
again.
- 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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