User Guide M211095en-h



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‣ Status Flags (page 113)
5.10.2.5 WMT700 Data Message 25
WMT700 Data Message 25 reports wind measurement, sonic temperature, and status data.
The checksum is included in the message. WMT700 calculates the checksum by applying 8- bit XOR for all bytes between checksum calculation start point and endpoint. The result is printed as a digit hexadecimal value. The message is in the following format:
\ss$\ws,\wd,\wp,\wm,\Ts,\er,\se\sp\cr\lf
\ss
Checksum calculation start point, not shown in the message
$
Fixed text
\ws
Wind speed, average
\wd
Wind direction, average
\wp
Wind speed, maximum
\wm
Wind speed, minimum
\Ts
Sonic temperature
\er
Status code. The code is a decimal number. Each bit corresponds to a status flag. See Status Flags (page 113)
\se
Checksum calculation endpoint, not shown in the message
\sp
Print checksum (to verify message integrity)
\cr
CR (carriage return)
\lf
LF (line feed)
Chapter 5 – Operation
123


Example
$03.22,75.29,03.38,03.07,22.13,0,3E
Interpretation of the example message:
• Wind speed, average 3.22 m/s
• Wind direction, average Wind speed, maximum 3.38 m/s
• Wind speed, minimum 3.07 m/s
• Sonic temperature 22.13 °C
• Status code 0
• Checksum: A 5.10.2.6 ROSA - MES Data Message
The MES data message 12 is used in the ROSA Surface Analyzer for Roads and Runways system. You can use this data message when WMT700 is connected to the Vaisala ROSA
system.
This message contains sensor identifications (sids), corresponding data items, and the synchronization characters SOH, STX, and ETX. The lines are ended by CR and LF characters Missing Readings
If WMT700 is notable to measure the wind, it indicates a missing reading in the output. The most common reasons for measurement problems are ice, birds, or other foreign objects on the line of measurement.
When the WMT700 profile is used, WMT700 indicates missing readings by showing 999 in the data messages.
When the WMT700 Data Message 22 is polled, missing readings are indicated with the following response:
$999.00,999.00
5.10.4 Error Indication
WMT700 provides advanced self-diagnostics for monitoring the status of the wind sensor and the validity of the measurement data. You can use the diagnostics as follows:
WMT700 User Guide
M211095EN-H
124


• WMT700 checks the status of the internal operational software at each reset by verifying the CRC checksum of the software. The software check is not made periodically it is only made at each reset. If the checksum is incorrect, WMT700 does not start up. If the checksum is correct, WMT700 continues by calculating the CRC
checksum of the parameter memory. In case the parameter memory is corrupted, the sensor replies with the text Parameters crc error upon startup. In case the parameter memory checksum is correct, WMT700 replies with the text ready as shown in the example below.
>$WMT700 v
ready.
• To check the status of the wind sensor, include the status code item er in the data message. You need to convert the status code to a binary number to verify the status.
An error code does not indicate that the wind data is invalid.
• To check that the wind data is valid, include the \va item in the data message.
• To check other diagnostics-related data, include the required items in the data message.


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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