Keithley KPCI-488 LPA, User Manual

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2-12 Return to Section Topics KPCI-488LPA-900-01 Rev. A / December 2008
Section 2: NI Command Compatible Functions Model KPCI-488LPA GPIB Controller Interface Card User’s Manual
ibcac
Description This command sets the assigned GPIB board to be the active controller by setting the
ATN line to enable. The GPIB board must be the CIC (controller in charge) before
calling ibcac . Use ibsic to set the board as the CIC. The board can take control
synchronously (1), asynchronously (2), or either (v). If either, the GPIB board tries to
create the ATN signal but does not terminate the data transfer (synchronous control is
tried first). If this fails, the board takes asynchronous control by immediately creating
the ATN signal without considering any current data transfer for asynchronous control.
Support Level Board level
Syntax Microsoft C/C++ and Borland C++
int ibcac(int ud, int synchronous)
Visual Basic
idcac (ByVal ud As Integer, ByVal v As Integer) As
Integer
- or -
call ibcac (ByVal ud As Integer, ByVal v As Integer)
Parameters ud : board unit descriptor
v : either synchronous or asynchronous control
0: asynchronously
1: synchronously
Return Value The value of the ibsta
Error Codes EARG, ECIC, EDVR, EOIP, ENEB
ibclr
Description This command sends the GPIB Selected Device Clear (SDC) message to the
assigned device.
Support Level Device level
Syntax Microsoft C/C++ and Borland C++
int ibclr (int ud)
Visual Basic
idclr (ByVal ud As Integer) As Integer
- or -
call ibclr (ByVal ud As Integer)
Parameters ud : device unit descriptor
Return Value The value of the ibsta
Error Codes EARG, EBUS, ECIC, EDVR, EOIP, ENEB