Campbell-scientific CR3000 Micrologger Manual de usuario descargar pdf (Pagina 141)

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101

Section 7. Installation

141

Table 19. Program Timing Instructions

Instructions General Guidelines Syntax Form

SubScan / NextSubScan

Use when measurements or

processing must run at faster

frequencies than that of the

main program.

BeginProg

Scan()

SubScan()

NextSubScan

NextScan

EndProg



7.7.3.7.1 Scan() / NextScan

Simple CR3000 programs are often built entirely within a single Scan() /

NextScan structure, with only variable and data-table declarations outside the

Scan() / NextScan structure. In these simple programs, Scan() / NextScan creates

an infinite loop, each periodic pass through the loop being synchronized to the

CR3000 clock. Scan() parameters allow modification of the period in 10- ms

increments. As shown in CRBasic example BeginProg / Scan() / NextScan /

EndProg Syntax (p. 141), aside from declarations, the CRBasic program may be

relativ

ely short.

CRBasicExample15. BeginProg/Scan()/NextScan/EndProgSyntax

BeginProg

Scan(1,Sec,3,0)

PanelTemp(RefTemp, 250)

TCDiff(TC(),6,mV20C,1,...)

CallTable Temp

NextScan

EndProg



Scan() determines how frequently instructions in the program are executed, as

shown in CRBasic example Scan Syntax

(p. 141):

CRBasicExample16. ScanSyntax

'Scan(Interval, Units, BufferSize, Count)

Scan(1,Sec,3,0)

ExitScan



Scan() has four parameters:

• Interval — the interval between scans.

• Units — the time unit for the interval. Interval is 10 ms <= Interval <= 1 day.

• BufferSize — the size (number of scans) of a buffer in RAM that holds the

raw results of measurements. When running in Pipeline mode, using a buffer

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