Visual Basic

This function can be called in a Visual Basic program. It sends the *IDN? query to the instrument and returns the byte count and ASCII response string.

 

Rem This example is based on Example 2-1 from the NI-VISA User Manual.

 

Public Sub IdnMain(ByVal address As String, ByRef byteCount As String, ByRef returnBytes As String)

Const BUFFER_SIZE = 200

Dim stat As ViStatus

Dim dfltRM As ViSession

Dim sesn As ViSession

Dim retCount As Long

Dim buffer As String * BUFFER_SIZE

Rem ***Include visa32.dll as a reference in your project.***

 

Rem Begin by initializing the system

stat = viOpenDefaultRM(dfltRM)

If (stat < VI_SUCCESS) Then

Rem Error initializing VISA...exiting

MsgBox “Can't initialize VISA”

Exit Sub

End If

Rem Open communication with Device

Rem NOTE: For simplicity, we will not show error checking

Rem TODO: Add error handling.

stat = viOpen(dfltRM, address, VI_NULL, VI_NULL, sesn)

Rem Set the timeout for message-based communication

Rem TODO: Add error handling.

stat = viSetAttribute(sesn, VI_ATTR_TMO_VALUE, 120000)

Rem Ask the device for identification

Rem TODO: Add error handling.

stat = viWrite(sesn, “*IDN?”, 5, retCount)

stat = viRead(sesn, buffer, BUFFER_SIZE, retCount)

Rem TODO: Add code to process the data.

byteCount = retCount

returnBytes = Left(buffer, retCount)

Rem Close down the system

Rem TODO: Add error handling.

stat = viClose(sesn)

stat = viClose(dfltRM)

End Sub

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