Campbell Scientific CR6 CR6 Measurement and Control System - Page 179
Text Signature, 9.1.7.2 Binary Runtime Signature, 9.1.7.3 Executable Code Signatures
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Section 7. Installation Scan(5,Sec,1,0) 'Measure reference temperature PanelTemp(PTemp_C,_60Hz) 'Measure three thermocouples and scale each. Scaling factors from the scaling array 'are applied to each measurement because the syntax uses an argument of 3 in the Reps 'parameter of the TCDiff() instruction and scaling variable arrays as arguments in the 'Multiplier and Offset parameters. TCDiff(Temp_C(), 3, mV200C,U1,TypeT,PTemp_C,True,0,15000,Mult(),Offset()) CallTable(Min_5) NextScan EndProg 7.9.1.7 Signatures: Example Programs 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 CR6 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 7.9.1.7.1 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. 179). 7.9.1.7.2 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. 179). 7.9.1.7.3 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. 179). CRBasic Example 25. Program Signatures ' how to request the program text signature (ProgSig = Status.ProgSignature), and the 'binary run-time signature (RunSig = Status.RunSignature). It also calculates two 'executable code segment signatures (ExeSig(1), ExeSig(2)) 'Define Public Variables Public RunSig, ProgSig, ExeSig(2),x,y 179
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