Campbell-scientific CR800 and CR850 Measurement and Control Systems Manual de usuario descargar pdf (Pagina 200)

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101

Section 7. Installation

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Note Do not confuse CRBasic files with .DLD extensions with files of .DLD

type used by legacy Campbell Scientific dataloggers.

As an example, pseudo code using this feature might be written as:

#Const Destination = "CR800"

#If Destination = "CR3000" Then

#ElseIf Destination = "CR1000" Then

#ElseIf Destination = "CR800" Then

#Else

#EndIf

This logic allows a simple change of a constant to direct, for instance, which

measurement instructions to include.

CRBasic Editor now features a pre-compile option that enables the creation of a

CRBasic text file with only the desired conditional statements from a larger

master program. This option can also be used at the pre-compiler command line

by using -p <outfile name>. This feature allows the smallest size program file

possible to be sent to the CR800, which may help keep costs down over very

expensive telecommunications links.

CRBasic example Conditional Compile

(p. 200) shows a sample program that

demonstrates use of conditional compilation features in CRBasic. Within the

program are examples showing the use of the predefined LoggerType constant

and associated predefined datalogger constants (CR800, CR1000, and CR3000).

CRBasicExample39. ConditionalCompile

'Conditional compilation example for CR3000, CR1000, and CR800 Series Dataloggers

'Key instructions include #If, #ElseIf, #Else and #EndIf.

'Set program options based on the setting of a constant in the program.

Const ProgramSpeed = 2

#If ProgramSpeed = 1

Const ScanRate = 1 '1 second

Const Speed = "1 Second"

#ElseIf ProgramSpeed = 2

Const ScanRate = 10 '10 seconds

Const Speed = "10 Second"

#ElseIf ProgramSpeed = 3

Const ScanRate = 30 '30 seconds

Const Speed = "30 Second"

#Else

Const ScanRate = 5 '5 seconds

Const Speed = "5 Second"

#EndIf

'Choose a COM port depending on which logger type the program is running in.

#If LoggerType = CR3000

Const SourcSerialPort = Com3

#ElseIf LoggerTypes = CR1000

Const SourcSerialPort = Com2

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