Specifications

Section 7. Measurement Instructions
7-38
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 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.