Specifications

Section 7. Measurement Instructions
Parameter
& Data Type
Enter
CS7500Cmd
The CS7500Cmd parameter requests the data to be retrieved from the sensor. The
command is sent first to the device specified by the SDMAddress parameter. If the
Reps parameter is greater than 1, subsequent CS7500s will be issued the command
with each rep. The results for the command will be returned in the array specified by
the Dest parameter. A numeric code is entered to request the data:
Code
Description
0
Get CO2 & H2O molar density (mmol/m3)
1
Get CO2 & H2O absorptance
2
Get internal pressure estimate (kPa), auxiliary measurement A,
auxiliary measurement B, and cooler voltage (V)
3
Get cell diagnostic value, output bandwidth (Hz), and programmed
delay [230 + (delay * 6.579)] (msec)
4
Get all data (CO2 molar density (mmol/m3), H2O molar density
(mmol/m3), CO2 absorptance, H2O absorptance, internal pressure
estimate (kPa), auxiliary measurement A, auxiliary measurement B,
cooler voltage (V), cell diagnostic value, output bandwidth (Hz), and
programmed delay [230 + (delay * 6.579)] (msec))
5
Get CO2 & H2O molar density (mmol/m3) and internal pressure
estimate (kPa)
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
Variable
Array
The Dest parameter is a variable array 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
Constant or
Expression
The Reps parameter is the number of times the measurement should be
made. Measurements are made on consecutive channels.
SDMAddress
Constant
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.
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