YOKOGAWA 765501 - GP-IB Access Function

16-50
IM 765501-01E
16.4.2 GP-IB Access Function
Attribute VB_Name = “GpibLib”
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‘ GPIB Access Function
‘
‘ Board: AT-GPIB/TNT IEEE488.2 by National Instruments.
‘
‘ Used modules: Niglobal.bas and Vbib-32.bas by National Instruments
‘
‘================================================================
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‘ Constant declaration Change them as necessary.
‘
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Const BOARD_ID = 0 ‘ GPIB board ID
Const ADDRESS = 1 ‘ GS610 GPIB address
Const TIMEOUT = T1s ‘ Timeout value
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‘ Access Functions
‘
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‘ Open function
Function CommOpen() As Integer
Dim dev As Integer
dev = ildev(BOARD_ID, ADDRESS, 0, TIMEOUT, 1, XEOS + REOS + &HA)
If (dev >= 0) Then Call CommClear(dev)
CommOpen = dev
End Function
‘ Close function
Sub CommClose(dev As Integer)
Call ilonl(dev, 0)
End Sub
‘ Send function
Function CommSend(dev As Integer, msg As String) As Integer
If (ilwrt(dev, msg + Chr$(10), Len(msg) + 1) And (EERR Or TIMO)) Then
CommSend = -1
Else
CommSend = ibcntl
End If
End Function
‘ Receive function
Function CommRecv(dev As Integer, msg As String) As Integer
Dim ret As Integer
ret = ilrd(dev, msg, Len(msg))
If (ret And TIMO) Then
CommClear (dev)
CommRecv = -1
Else
If (ret And EERR) Then
CommRecv = -1
Else
CommRecv = ibcntl
End If
End If
End Function
16.4 Sample Programs