Campbell Scientific CR6 CR6 Measurement and Control System - Page 182
CRBasic Example 27., Conditional Compile
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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 . 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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