FT Technologies FT205EV, Руководство пользователя

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Section 6 Parameter Settings
44
FT205EV Wind Sensors
– User Manual
6.4.2 AT.1: Query the Acoustic Temperature
Command
Parameter
AT
Command
Syntax
SET Sensor:
N/A
QUERY Sensor:
$<listenerID>,AT?*<checksum><cr><lf>
$aa,AT?*hh<cr><lf>
Sensor output:
$<talkerID>,AT=<temp>,<units>,<status>*<checksum>
<cr><lf>
$aa,AT=±xxx.x,c,c*hh<cr><lf>
Parameters
<temp>
-077.8 to
+368.3
Read only parameter that returns the current acoustic temperature reading
in the range:
-61.0°C to +95.1°C
-77.8°F to +203.2°F
212.2K to 368.3K
<units>
C
The acoustic temperature is output in degrees Celsius
F
The acoustic temperature is output.in degrees Fahrenheit
K
The acoustic temperature is output in Kelvin
<status>
V
The acoustic temperature reading is valid.
A
An acoustic temperature reading is being acquired. The output may not be
valid during this time.
Examples
Example 1
Query the latest acoustic temperature reading
– a valid reading in degrees Celsius.
Message Comment
$01,AT?*//<cr><lf>
Query acoustic temperature
$WI,AT=+023.9,C,A*15<cr><lf>
Sensor response
Example 2
Query the latest acoustic temperature reading. A valid reading in Kelvin is being acquired.
Message
Comment
$01,AT?*//<cr><lf>
Query acoustic temperature
$WI,AT=+297.2,K,V*0C<cr><lf>
Sensor response
Example 3 - CU AT DFC Mode
$WI,WVC=000.0,333,0,+026.4,C,A*4B
Comment
CUE mode with AT (DFC Mode)
Example 4
– WV DFC Mode
$WI,WVC=000.0,323,0,+026.3,C,A*4D
Comment
WV response (DFC Mode)
Description
The AT query command returns the current acoustic temperature reading in the selected units.
An acoustic temperature reading will be returned even if the sensor is in the process of trying to
acquire a valid reading. The acoustic temperature reading is filtered with a one minute time
constant by default.
The accuracy of the acoustic temperature reading may be affected by the relative humidity of the
air surrounding the sensor. See Section 2.9 for further details.
Software version V7.5.1 introduced the option for AT (Acoustic Temperature) data to be inserted
within the CU & WV output data. A new DF command option (see Section 6.4.9) controls this
mode.
Caution: The acoustic temperature feature requires calibration at FT Technologies. If the sensor
has had a software upgrade to 7.5 (or above) then the data will be uncalibrated and may not
comply with the official specification.