
Section 7. Measurement Instructions
CSAT3 (Dest, Reps, SDMAddress, CSAT3Cmd, CSAT3Opt)
Communicates with the CSAT3 three-dimensional sonic anemometer. See
CSAT3 manual for more information.
Parameter
& Data Type
Enter
Dest The Dest parameter is a variable in which to store the results of the
measurement. This variable must be dimensioned to a length of five to hold
the CSAT3 Ux, Uy, Uz, speed of sound, and diagnostic data.
Reps The Reps parameter is the number of times the measurement should be
made. Measurements are made on consecutive channels. If the Reps
parameter is greater than 1, the Dest parameter must be a variable array.
SDMAddress The SDMAddress parameter defines the address of the CSAT3 with which
to communicate. Valid SDM addresses are 0 through 14. Address 15 is
reserved for the SDMTrigger instruction. If the Reps parameter is greater
than 1, the datalogger will increment the SDM address for each subsequent
CSAT3 that it communicates with.
The SDM address is entered as a base 10 number, unlike older, jumper-
settable SDM instruments that used base 4.
Command Commands 90 - 92 send a measurement trigger to the CSAT3 with the SDM
address specified by the SDMAddress argument. The CSAT3 also sends
data to the datalogger. Options 97 - 99 get data after a group trigger,
SDMTrigger(), from the CSAT3 specified by the SDMAddress parameter
without triggering a new CSAT3 measurements. The CSAT() instruction
must be preceded by the SDMTrigger() instruction in order to use Options
97 - 99.
Code
Description
90 Trigger and Get wind & speed of sound data
91 Trigger and Get wind & sonic temperature data
92 Trigger and Get wind & speed of sound data minus 340 m/s
97 Get wind & speed of sound data minus 340 m/s after a Group
Trigger
98 Get wind & sonic temperature data after a Group Trigger
99 Get wind & speed of sound data after a Group Trigger
Option The Option argument sets the CSAT3’s execution parameter. This
parameter tells the CSAT3 which measurement parameters to use and what
frequency to expect the measurement trigger from the datalogger. See the
table below for a brief description of each of the parameter and the CSAT3
manual for a detailed description.
Code Description
1 Set Execution Parameter to 1 Hz
2 Set Execution Parameter to 2 Hz
3 Set Execution Parameter to 3 Hz
5 Set Execution Parameter to 5 Hz
6 Set Execution Parameter to 6 Hz
10 Set Execution Parameter to 10 Hz
12 Set Execution Parameter to 12 Hz
20 Set Execution Parameter to 20 Hz
30 Set Execution Parameter to 30 Hz
60 Set Execution Parameter to 60 Hz
61 Set Execution Parameter to 60 Hz to 10 Hz Oversample Mode
62
Set Execution Parameter to 60 Hz to 20 Hz Oversample Mode
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