Opening an Instrument Session

The Agilent 816x VXIplug&play Instrument Driver

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

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.

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 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 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

Agilent 8163A/B, 8164A/B & 8166A/B Mainframes, Fifth Edition

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Agilent Technologies 8164A, B Opening an Instrument Session, 227, Successful completion of this function returns Visuccess
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8163A, 8164A, 8166A, B specifications

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