Campbell-scientific CR800 and CR850 Measurement and Control Systems Uživatelský manuál stáhnout pdf (Strana 243)

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Section 7. Installation

243

scan times, two separate scans can be used with logic to jump between them. If a

PulseCount() is used in both scans, then a PulseCountReset is used prior to

entering each scan.

7.8.16 Program Signatures

A program signature is a unique integer calculated from all characters in a given

set of code. When a character changes, the signature changes. Incorporating

signature data into a the CR800 data set allows system administrators to track

program changes and assure data quality. The following program signatures are

available.

• text signature

• binary-runtime signature

• executable-code signatures

7.8.16.1 Text Signature

The text signature is the most-widely used program signature. This signature is

calculated from all text in a program, including blank lines and comments. The

program text signature is found in the Status table as ProgSignature. See CRBasic

example Program Signatures

(p. 243).

7.8.16.2 Binary Runtime Signature

The binary runtime signature is calculated only from program code. It does not

include comments or blank lines. See CRBasic example Program Signatures

(p.

243).

7.8.16.3 Executable Code Signatures

Executable code signatures allow signatures to be calculated on discrete sections

of executable code. Executable code is code that resides between BeginProg and

EndProg instructions. See CRBasic example Program Signatures

(p. 243).

CRBasicExample51. ProgramSignatures

'Program reports the program text signature (ProgSig = Status.ProgSignature), the

'binary run-time signature (RunSig = Status.RunSignature), and calculates two

'executable code segment signatures (ExeSig(1), ExeSig(2))

'Define Public Variables

Public RunSig, ProgSig, ExeSig(2),x,y

'Define Data Table

DataTable(Signatures,1,1000)

DataInterval(0,1,Day,10)

Sample(1,ProgSig,FP2)

Sample(1,RunSig,FP2)

Sample(2,ExeSig(),FP2)

EndTable

'Program

BeginProg

ExeSig() = Signature 'initialize executable code signature

1 2 ... 238 239 240 241 242 243 244 245 246 247 248 ... 565 566

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