Campbell-scientific CR9000X Measurement and Control System Manual de usuario descargar pdf (Pagina 358)

Section 9. Program Control Instructions

CalFile(Source/Dest, NumVals, "Device:filename", Option)

The CalFile instruction provides a way to store sensor calibration data from a

program into a file located on the CRD: drive or the CPU: drive as well as to

the CR9000X's non-volatile Flash memory with the same instruction. When

the CR9000X is powered up, all Calibration Files located in flash memory will

be loaded into SDRAM memory.

Syntax

CalFile (Source/Dest, NumVals, "Device:filename", Option)

Remarks

The data in the file is stored as 4 byte binary single precision floating point

values (in the native format of the logger) with a 2 byte signature appended to

the end of the data. This signature is checked (if reading) to verify that the file

is not corrupt.

The CalFile instruction has these parts:

Parameter

& Data Type

Enter

CALFILE PARAMETERS

Source/Dest

Array

A variable array specifying where to read data from or write data to.

NumVals

Constant

The number of values that should be written to or read from the calibration

file.

Device;

Filename

Text

The Device on which the file is stored and the FileName must be specified

and the entire string must be enclosed in quotation marks. Device = CPU,

the file is stored in datalogger memory. Device = CRD, the file is stored on

a PCMCIA card..

Option

Numeric code to determine whether to create or read a calibration file.

Constant 0 Write source array to File

1 Read data from file and if signature matches, write to array

2 Write source array to file and commit file to flash memory.

3 Commit file system contents to non-volatile memory.

CalFile Instruction Example

Const numvals = 25 : dim i

Public tfail, tdone, array1(numvals), array2(numvals)

BeginProg

for i = 1 to numvals

array1(i) = i 'write values into array

next i

CALFILE(array1,numvals,”CPU:calfile.cal”,0) 'store the values to the file

CALFILE(array2,numvals,”CPU:calfile.cal”,1) 'read the values to array2

for i = 1 to numvals 'test retrieved values

if array2(i) <> array1(i) then

tfail = 1

endif

next i

tdone = 1

EndProg

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Campbell-scientific CR9000X Measurement and Control System Manual de usuario Pagina 358

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