User Guide M211095en-h



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‣ S — Set Parameter (page 103)
5.13 Wind Speed Output
In a system configured for WS425, you can set WMT700 to measure wind speed and send analog output as frequency or voltage.
These sections describe WMT700 analog output:
• Settings are configured according to
5.12.1 Analog Output Settings (page Wires are connected according to
4.11.6.1.1 ROSA Cable 10 m (Analog Outputs)
(page 93)
5.13.1 Frequency
When frequency is selected as the wind speed analog output, WMT700 sends a pulsed signal of 0 to 10 V with a frequency proportional to wind speed through AOUT1. Every mile per hour adds 5 Hz (WS425) to the frequency. In SI units, a change of 0.894 meters per second adds 10 Hz to the frequency. A frequency counter is required to count the output in
Hz and the calculation that scales the result to appropriate units.
The following figure shows the frequency output when an adapter cable for analog frequency output (SP) and a WS425 cable are used. With WMT700, the wind speed signal appears at pin 14 (pink) of the adaptor cable.
Chapter 5 – Operation
129

Figure 43 Wind Speed Frequency Analog Output with WS425 Cable and Adapter Cable for
Analog Frequency Output Voltage
When voltage is selected as the wind speed analog output, the output from WMT700 varies linearly from 0 VDC at 0 miles per hour to 1 VDC at 125 miles per hour. In SI units, the voltage varies linearly from 0 VDC at 0 meters per second to 1 VDC at 55.88 meters per second.
The following figure shows the voltage output when an adapter cable for voltage output
(227571SP) and a WS425 cable are used. With WMT700, the wind speed signal appears at pin 15 (violet) of the adaptor cable. The violet wire must be connected to V read channel,
and the pink wire must be connected to the analog ground.
WMT700 User Guide
M211095EN-H
130

Figure 44 Wind Speed Voltage Analog Output with WS425 Cable and Adapter Cable for
Analog Voltage Output Wind Direction Output
When wind direction is measured, WMT700 sends analog output as simulated potentiometer output voltage referred to as external reference voltage. The output is a proportional signal 0 ... 100 % of the reference voltage representing the wind direction. The reference voltage must be in the range of 1.0 ... 4.0 VDC (WMS425) or 0 … 10 VDC
(WMT700). The output is 0 VDC at zero degrees and increases to the reference voltage at degrees.
The following figure shows the output for wind direction. With WMT700, the wind direction signal appears at pin 13 (gray) of the adapter cable.
Chapter 5 – Operation
131

Figure 45 Wind Direction Voltage Output with WS425 Cable and Adapter Cable Limitations for Output Signals
You can specify the minimum and maximum values for analog output with the configuration parameters. The output is fixed to the specified values, and the unit depends on the selected analog output mode.
Example
To limit the output 1 in voltage mode to a range of 0.1 … 5 V, set the analog output minimum value to 0.1 and the analog output maximum value to 5. Type the following commands:
S aout1minv,0.1 S aout1maxv,5 5.16 Missing Readings and Error
Indication
If WMT700 is unable to measure the wind, it indicates a missing reading in the output. The most common reasons for measurement problems are foreign objects (such as ice, birds, or other foreign object) on the line of measurement or sound reflections from nearby objects
(such as wind tunnel walls).
WMT700 User Guide
M211095EN-H
132

The default error indication is an out-of-range signal that is more than 10 V or 20 mA but other error settings can also be configured.
Example
To set analog output 1 error indication in voltage mode to 1 V, set the analog output error value to 1. Use the following command:
S aout1err,1


Document code
Testsetup according to
More information
Optiontemperature range
Optionheating
Optionhardware interface
Optionunit used
Optionoutput configuration
Selectionoutput configuration
Optionadapter type
Optionaccessories
Order codedescription
Aout1 selected option
Output signal
Swnddiroffset,(angle)
Parameterdefinition
Power supplywire colors
Used heating option
Heating option
Wire type/cable length
Descriptionspare part item
Wmt700connector pin
Open commandto activate the command, press enter
Commanddescription
Wind_getfetches wind calibration information.more information
S command. power must be on for at least 5 seconds after the s
Startcommand.more information
Itemdescription
Bitdescription
G command to fetch the current wmt700 parameters. disable error messages with the command s messages,0
Errors. if all values are valid, wmt700 sends the following response:0,0,0,0you can also use the g
Data message number
Ws425 and sdi messages
Parametername
Parameterdefault
Start command.to stop measurement, use the stop
Wb,wfirmware
Wf output:wff6785672109876.5432.1k99xx5.21.2 ws425 f/g asos data messagewmt700 responds to the wa
Bytedescription
Parameterdefault value
Id character
Wx command with a character fixed-length data message.character
Start command. to stop measurement, use thestop
Problemprobable cause
Error/eventcode
Parameter name
Propertydescription/value
Analog outputs for wind direction
Itemorder code
Configuration mode / measurement
Settingparameter
Start command. you can stop the measurement with the stop
Example of the command and response:
Baud........................................................................ 105clearerr
S............................................................................... 103sleep
Gget message. get parameter.........................................................104h
Jjunction box...............................................................28l



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