Agilent Technologies 8163A Benutzerhandbuch
Opening an Instrument Session
The Agilent 816x VXIplug&play Instrument Driver
Agilent 8163A/B, 8164A/B & 8166A/B Mainframes, Fifth Edition
227
Opening an Instrument Session
To control an instrument from a program, you must open a communication
path between the computer/controller and the instrument. This path is
known as an instrument session, and is opened with the function
path between the computer/controller and the instrument. This path is
known as an instrument session, and is opened with the function
ViStatus
hp816x
_init( ViRsrc InstrDesc, ViBoolean id_query, ViBoolean reset,
ViPSession instrumentHandle );
Instruments are assigned a handle when the instrument session is
opened. The handle, which is a pointer to the instrument, is the first
parameter passed in all subsequent calls to driver functions.
opened. The handle, which is a pointer to the instrument, is the first
parameter passed in all subsequent calls to driver functions.
The parameters of the function hp816x
_init
include:
•
ViRsrc InstrDesc
: the address of the instrument
•
ViBoolean id_query
: a Boolean flag which indicates if in-system verifica-
tion should be performed.
Passing
Passing
VI_TRUE
(1) will perform an in-system verification; passing
VI_FALSE
(0) will not.
If you set
id_query
to false, you can use the generic functions of the in-
strument driver with other instruments.
•
ViBoolean reset
: a Boolean flag which indicates if the instrument should
be reset when it is opened.
Passing
Passing
VI_TRUE
(1) will perform a reset when the session is opened;
passing
VI_FALSE
(0) will not perform a reset,
•
ViPSession instrumentHandle
: a pointer to an instrument session.
InstrumentHandle
is the handle which addresses the instrument, and is
the first parameter passed in all driver functions.
Successful completion of this function returns
VI_SUCCESS