Vaisala WXT-53x X2 Integration Guide


Vaisala WXT weather instruments provide six of the most important weather parameters, which are air pressure, temperature, humidity, rainfall, wind speed and direction through various combinations. The X2 data logger currently supports (i.e., pre-loaded scripts are available) for the WXT520 and WXT531-536 weather stations. Settings on the sensor may be adjusted using the Vaisala WXT Configuration Tool along with the purchase of a USB service cable. Below is information on the settings and wiring required to integrate this sensor with the X2 data logger.

Figure 1: Vaisala WXT536 Multi-Parameter Weather Sensor

 

Wiring

In most applications, a connectorized NexSens UW8 plug to flying lead cable is wired internally within a Vaisala WXT weather station.

NexSens UW8 Plug PinNexSens UW8-FLx Wire Color*SignalVaisala Terminal Strip Identifier
2BlackGroundVIN –
5Red12V PowerVIN +
6BrownSDI-12RXD (Jumped to TX-)**

*NexSens UW Plug to Flying Lead Cable
**A grey jumper cable is included with the purchase of a Vaisala weather station.

Figure 2: NexSens UW8 Plug pin numbers.

 

 

Configure Communication

Manual Configuration String

During sensor detection, the X2 sends configuration strings via the Vaisala WXT-series script to set up the weather station parameter output. Only one configuration string must be sent manually via the Vaisala WXT Configuration Tool and a USB service cable. The weather station must be set in Continuous SDI-12 mode to ensure the station is recording during precipitation events.

  1. Open the Vaisala WXT Configuration Tool.
  2. Go to Settings | Device Settings.
  3. Under Communication Protocol, check the box next to Continuous Measurements.
    1. The unit is now set to Continuous SDI-12 mode.

 

  1. Click OK and exit the software.
  2. Allow the X2 to detect the sensor and apply the automatic configurations strings described below.

 

Automatic Configuration Strings Sent During Detection
ModuleConfiguration StringsDescription
First stringSecond stringThird string
PTU (Temperature, Pressure & Humidity)XTU,R=1111000011010000!

XTU,I=60,P=H,T=C!

Enables temperature, pressure & humidity parameters-60 second update interval
-hPA pressure unit
-Celsius temperature unit
WindXWU,R=1111100001011100,G=1!

XWU,I=120,A=120,U=M,D=0,F=4!

Enables wind direction and wind speed parameters.-120 second update interval
-120 second averaging interval
-m/s wind speed unit
-Zero degree direction offset
-4 Hz wind sampling frequency
PrecipitationXRU,R=1111110011111100!

XRU,I=60,U=M,S=M,M=R!

XRU,Z=M,X=100,Y=100!

Enables rain and hail parameters.-60 second update interval
-Metric precipitation units (mm)
-Metric hail units (hits/cm2)
-Auto-on/off precipitation mode
-Manual precipitation reset mode
-Rain accumulation counter limit (100mm or 3.9 in)
-Hail accumulation counter limit (10 hits/cm2)
SupervisorXSU,R=1111100011100000!

XSU,I=15,S=Y,H=Y!

XSU,I=15,S=Y,H=N!

Enables heater and supply voltage parameters(If heating is equipped):
-60 second update interval
-Error messaging enabled
-Heating control enabled
(If heating is not equipped):
-60 second update interval
-Error messaging enabled
-Heating control disabled

 

X2 Script Information

The X2 data logger includes a pre-loaded Vaisala WXT-series script. For new X2 data loggers, this script is enabled by default. If the script is not enabled, use the CONNECT software to enable the script for sensor detection.

Configure Sensor Scripts

X2 Script NumberCommunication ProtocolBaud RatePower TypeWarmup Period (sec)Frame
2002SDI-121200Continuous0E71

 

 

Script Parameters

ParameterUnitDescriptionAssociated WXT models
Wind directiondegScalar average of wind direction values over selected averaging time.*520, 532, 533, 536
Wind direction correctiondegCorrected wind direction value based on user-defined offset.520, 532, 533, 536
Minimum wind speedm/sMinimum wind speed over selected averaging time.*520, 532, 533, 536
Average wind speedm/sScalar average of wind speed values over selected averaging time.*520, 532, 533, 536
Maximum wind speedm/sMaximum wind speed over selected averaging time.*520, 532, 533, 536
Air temperatureC520, 534, 535, 536
Humidity%520, 534, 535, 536
PressurehPa520, 534, 535, 536
Rain intervalmmCumulative rain. (Resets during power cycle)520, 531, 533, 535, 536
Rain durationsecondsDuration of latest rain event.520, 531, 533, 535, 536
Rain intensitymm/hRain intensity during one-minute period before the X2 requests a measurement.520, 531, 533, 535, 536
Hail intervalhits/cm2Cumulative hail. (Resets during power cycle)520, 531, 533, 535, 536
Hail durationsecondsDuration of latest hail event.520, 531, 533, 535, 536
Hail intensityhits/cm2/hrHail intensity during one-minute period before the X2 requests a measurement.520, 531, 533, 535, 536
Heater temperatureCTemperature of internal heater.All models
Heating voltageVVoltage supplied for heating operation.All models
Supply voltageVVoltage supplied for normal operation.All models

*Wind averaging time following detection is 120 seconds.

 

More information on the Vaisala WXT-series weather stations can be found on the Vaisala website.