Agilent Technologies E2094S Guia do Utilizador descarregar pdf (Página 23)

Building a VISA Application in Windows 2

Agilent VISA User’s Guide 23

Sample Program Contents

A summary of the VISA function calls used in the preceding sample

Visual Basic program follows. For a more detailed explanation of VISA

functionality, see Chapter 3, “Programming with VISA.” See the VISA

Online Help for more detailed information on these VISA function

calls.

Call viOpen(defrm, "GPIB0::22::INSTR", 0, 0,

vi)

' Initialize device

Call viVPrintf(vi, "*RST" + Chr$(10), 0)

' Ask for the device's *IDN string.

Call viVPrintf(vi, "*IDN?" + Chr$(10), 0)

' Read the results as a string.

Call viVScanf(vi, "%t", strRes)

' Display the results

MsgBox "Result is: " + strRes, vbOKOnly,

"*IDN? Result"

' Close the vi session and the resource

manager session

Call viClose(vi)

Call viClose(defrm)

End Sub

Table 3 Summary of VISA Function Calls in Visual Basic Sample

Function(s) Description

viOpenDefaultRM You must first open a session with the default

resource manager with the viOpenDefaultRM

function. This function will initialize the default

resource manager and return a pointer (defrm) to that

resource manager session.

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Agilent Technologies E2094S Guia do Utilizador Página 23