Campbell Scientific CR6 CR6 Measurement and Control System - Page 182

CRBasic Example 27., Conditional Compile

Page 182 highlights

Section 7. Installation 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 . This feature allows the smallest size program file possible to be sent to the CR6, which may help keep costs down over very expensive telecommunication links. CRBasic example Conditional Compile (p. 182) 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 27. Conditional Compile ' program compilation than is conditional on datalogger 'model and program speed. Key instructions include #If, #ElseIf, #Else and #EndIf. 'Set program options based on: ' LoggerType, which is a constant predefined in the CR6 operating system ' ProgramSpeed, which is defined in the following statement: Const ProgramSpeed = 2 #If ProgramSpeed = 1 Const ScanRate = 1 Const Speed = "1 Second" #ElseIf ProgramSpeed = 2 Const ScanRate = 10 Const Speed = "10 Second" '1 second '10 seconds #ElseIf ProgramSpeed = 3 Const ScanRate = 30 '30 seconds Const Speed = "30 Second" #Else Const ScanRate = 5 '5 seconds Const Speed = "5 Second" #EndIf 'Public Variables Public ValueRead, SelectedSpeed As String * 50 'Main Program BeginProg 'Return the selected speed and logger type for display. #If LoggerType = CR3000 SelectedSpeed = "CR3000 running at " & Speed & " intervals." #ElseIf LoggerType = CR1000 SelectedSpeed = "CR1000 running at " & Speed & " intervals." #ElseIf LoggerType = CR800 SelectedSpeed = "CR800 running at " & Speed & " intervals." #Else SelectedSpeed = "Unknown Logger " & Speed & " intervals." #EndIf 182

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Section 7.
Installation
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 CR6, which may help keep costs down over very
expensive telecommunication links.
CRBasic example
Conditional Compile
(p. 182)
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 27.
Conditional Compile
'<TPED> program compilation than is conditional on datalogger
'model and program speed. Key instructions include #If, #ElseIf, #Else and #EndIf.
'Set program options based on:
'
LoggerType, which is a constant predefined in the CR6 operating system
'
ProgramSpeed, which is defined in the following statement:
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
'Public Variables
Public
ValueRead, SelectedSpeed
As String
* 50
'Main Program
BeginProg
'Return the selected speed and logger type for display.
#If
LoggerType = CR3000
SelectedSpeed = "CR3000 running at " & Speed & " intervals."
#ElseIf
LoggerType = CR1000
SelectedSpeed = "CR1000 running at " & Speed & " intervals."
#ElseIf
LoggerType = CR800
SelectedSpeed = "CR800 running at " & Speed & " intervals."
#Else
SelectedSpeed = "Unknown Logger " & Speed & " intervals."
#EndIf
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