Agilent Technologies Computer Hardware U2802A User Manual

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Getting Started 1
Agilent U2802A 31-Channel Thermocouple Input User’s Guide 19
IVI-COM Drivers
The Agilent IVI- COM drivers simplify instrument control when you are
working in a COM- compatible environment. IVI-COM allows you to
programmatically control your instrumentation and make measurements
while providing a greater degree of instrument interchangeability and code
reuse. The Agilent IVI- COM drivers support the use of IntelliSense for
even greater ease- of- use within a Microsoft development environment.
The Agilent IVI- COM driver supports all Agilent Series DAQs. The Agilent
Firmware Revision: A.2006.10.10 is the minimum revision required for full
driver functionality.
An IVI- COM driver can program a particular set of instrument models. It
implements an instrument- specific interface tuned to the capabilities of
those models. The driver may also implement an IVI class- compliant
interface which implements a limited set of functionality common to all
instruments of the class. Instrument class-compliant interfaces are defined
by the IVI Foundation. The application writer must choose whether to use
the instrument- specific interface or the class-compliant interface.
The IVI inherent capabilities, through the IIviDriver interface, are available
in both the instrument- specific interface and class- compliant interface.
The general programming techniques are also the same.
Choosing Instrument-Specific Interface
With this interface, you have the benefit of full access to the instrument's
capabilities. All capabilities in the class- compliant interface are also
covered by the instrument- specific interface, but you will find some
capabilities in the instrument- specific interface that are not available
through the class- compliant interface. You may also see some performance
enhancements, as the driver can be tuned to use efficient programming
methods for that particular instrument.
Choosing Class-Compliant Interface
By limiting your program to the class- compliant interface, you have the
potential advantage of syntactic interchangeability. Hence, another
IVI-COM driver (and instrument) which supports the same class could be
substituted for the original driver, if the prior IVI- COM driver supports all
the capability groups used in the original driver. In this case, the
U2802A_UG.book Page 19 Tuesday, January 8, 2008 10:24 AM

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