Campbell Scientific CR800 and CR850 Measurement and Control Systems - Manual (Page 459)

Appendix A. CRBasic Programming Instructions
459
Scan / ExitScan / ContinueScan / NextScan
Establishes the program scan rate. ExitScan and ContinueScan are optional. See
Faster Measurement Rates
(p. 232)
for information on use of Scan() / NextScan in
burst measurements.
Syntax
Scan (Interval, Units, Option, Count)
[statement block]
ExitScan
[statement block]
ContinueScan
[statement block]
NextScan
Select Case / Case / Case Is / Case Else / EndSelect
Executes one of several statement blocks depending on the value of an
expression. CaseElse is optional. Note that EndSelect and EndIf call the same
function.
Syntax
Select Case testexpression
Case [expression 1]
[statement block 1]
Case [expression 2]
[statement block 2]
Case Is [expression fragment]
Case Else
[statement block 3]
EndSelect
SlowSequence
Marks the beginning of a section of code that will run concurrently with the main
program.
Syntax
SlowSequence
SubScan / NextSubScan
Controls a multiplexer or measures some analog inputs at a faster rate than the
program scan. See Faster Measurement Rates (p. 232) for information on use of
SubScan / NextSubScan in burst measurements.
Syntax
SubScan (SubInterval, Units, Count)
[measurements and processing]
NextSubScan
TriggerSequence
Used with WaitTriggerSequence to control the execution of code within a slow
sequence.
Syntax
TriggerSequence(SequenceNum, Timeout)
WaitTriggerSequence
Used with TriggerSequence to control the execution of code within a slow
sequence.
Syntax
WaitTriggerSequence