Campbell Scientific CR800 and CR850 Measurement and Control Systems - Manual (Page 199)

Section 7. Installation
199
'Measure Two Thermocouples
TCDiff (TCTemp(),2,mV2500C,1,TypeT,RefTemp,True,0,250,1.0,0)
CallTable TempC 'Call data table
'Menu Item "Make Notes" Support Code
If CycleNotes = "Accept" Then
CallTable Notes 'Write data to Notes data table
CycleNotes = "Accepted" 'Write "Accepted" after written
Delay (1,500,mSec) 'Pause so user can read "Accepted"
SelectNote = "" 'Clear pick list note
EnterNote = "" 'Clear free entry note
CycleNotes = "??????" 'Write ????? as a null prompt
EndIf
If CycleNotes = "Clear" Then 'Clear notes when requested
SelectNote = "" 'Clear pick list note
EnterNote = "" 'Clear free entry note
CycleNotes = "??????" 'Write ????? as a null prompt
EndIf
'Menu Item "Control" Menu Support Code
CountDown = CountDown - 1 'Count down by 1
If CountDown <= 0 'Stop count down from passing 0
CountDown = 0
EndIf
If CountDown > 0 Then
StartFlag = True 'Indicate countdown started
EndIf
If StartFlag = True AND CountDown = 0 Then 'Interprocess count down
'and manual LED
ToggleLED = True
StartFlag = False
EndIf
If StartFlag = True AND CountDown <> 0 Then 'Interprocess count down and manual LED
ToggleLED = False
EndIf
PortSet (4,ToggleLED) 'Set control port according
'to result of processing
NextScan
EndProg
7.8.7 Conditional Compilation
When a CRBasic user program is sent to the CR800, an exact copy of the program
is saved as a file on the CPU: drive
(p. 316).
A binary version of the program, the
"operating program", is created by the CR800 compiler and written to Operating
Memory
(p. 317).
This is the program version that runs the CR800.
CRBasic allows definition of # conditional code in the user program that the
CR800 compiler includes, depending on the conditional settings, in the operating
program. This means the user-written program is evaluated for conditional
statements and an operating program that includes only the requested statements
is written to operating memory. In addition, all CRBasic dataloggers accept
program files or Include() instruction files with .DLD extensions. This gets
around the system filters that look at file extensions for specific loggers; it makes
possible the writing of a single file of code to run on multiple CRBasic
dataloggers.