User Guide M211095en-h



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Output Signal
Scaling/Units
Setting for Gain
Setting for Offset
Voltage
8 mV/mph
100 mV/m/s
0.017895 0.1 Current mA/m/s
0.0002 Frequency Hz/mph
10 Hz/m/s
11.185 10 0
WS425 - voltage mV/mph
0.017895 0
WS425 - frequency Hz/mph
11.185 Table 21 Common Transfer Function Settings for Aout2 (WD)
Output Signal
Scaling/Units
Setting for Gain
Setting for Offset
Voltage
4 mV/°
20 mV/°
0.004 0.02 Current uA/degree
0.00005 0
Potentiometer
359° = Aout ref 0
WMT700 User Guide
M211095EN-H
46

You can configure output scaling or transfer function settings in a variety of ways by changing the custom gain and offset. The basic measurement units are ms and degrees.
The physical output units are VA, and Hz. For the potentiometer, an output of 1 means of the Aout ref voltage.
The following formula illustrates the impact of gain and offset values on the produced output:
o = y + ks o
Produced analog output (VA, Hz, 100%)
s
Measured wind speed or direction (in ms or °)
k
Selected gain value y0
Selected offset value
Example
• Output mode voltage
• Offset: Gain With the above settings, the analog output voltage range is from 0 V (0 ms) to 7.5 V (ms. When the measured wind speed isms, the output voltage is 1.0 V.
Output = 0.0 + 10 × 0.1 = 1.0 V
Example
Output mode current
• Offset: Gain With the above settings, the analog output current range is 4 mA (0 ms) ... 19 mA (ms. When the measured wind speed isms, the output current is 6 mA.
Output = 0.004 + 10 × 0.0002 = 6.0 mA
3.8.3 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.
Chapter 3 – Functional Description
47


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 3.8.4 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).
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
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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