LABVIEW IVI DRIVER

Dotted properties are a shorthand alternative to cascading multiple Property Nodes that return interface references needed for wiring properties and methods specific to a given interface. Back to Top 2. Standardization in IVI also enables instrument interchangeability in your test system. Three Types of Simulation. Figure 3 illustrates this configuration. The IVI Engine uses these settings when it runs your test application.

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Focusing on the ease of use, traditional instrument drivers did not always provide optimal performance. The initial release of the IVI Driver Library includes a generic class driver for the following classes of instruments: The IVI architecture generates simulated labfiew in two different ways. For example, if an oscilloscope is connected to your PC through the GPIB bus with an address of 2you can use either of the following approaches:.

Using IVI Drivers in LabVIEW – National Instruments

This is typically the first interface in the list. Note To complete the exercises in this document, you do not need to have the actual instruments because you can run IVI drivers in simulation mode. Instrument drivers are an indispensable tool to help you rapidly develop test and measurement applications.

Record Value Coercions maintains a list of all coercions for Labveiw and Real values passed to the instrument driver VIs. Replace the default logical name, NewLogicalName, with the new case-sensitive name of your choice, such as MyDmm.

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Click Close and Quit. Click on the block diagram to place the Initialize method on the diagram. A dialog box appears, shown in Figure 1.

Users build their programs by calling the standard functions in the class drivers. When the VI performs a frequency sweep, only the frequency parameter changes. The developer can conditionally call the error query VI to learn more details about the instrument-specific error. The IVI Engine uses these settings when it runs your test application.

With state labviea, only the frequency parameter is sent to the instrument each time you labfiew the VI. The IVI Engine uses the default value listed below whenever you do not name a feature in the option string.

The VI configures the parameters for a function generator and sets the waveform shape, amplitude, offset, frequency, and start phase for ivo waveform. Interchangeability using IVI drivers is achieved through generic instrument class drivers.

Using IVI Drivers to Simulate Your Instrumentation Hardware in LabVIEW and LabWindows/CVI

You set up virtual channel names in the properties of a driver session. Otherwise, select Don’t Simulate and create a new hardware asset under the Hardware tab. You create this instrument handle in one of your initialize functions.

You should consider all driver choices available, and choose the driver that best fits your needs. Automation Open and type library refnum. The Type Library list contains the type libraries for all the registered ActiveX servers on the system in alphabetical order.

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IVI drivers maintain the physical state of instruments in a software cache to increase the efficiency and speed of instrument drivers. Note If the actual instruments are connected to your system, you can run the same examples with simulation disabled. Agilent IO Libraries Suite version To reduce any discrepancies, the driver coerces or rounds values to the actual value that the instrument uses internally. This simple data generation process will return data values to the program variables so subsequent function calls do not fail for lack of data.

Driver Sessions consist of an instrument driver software module, general property settings, and, when you are not in simulation mode, a hardware asset. This is the second level of simulation that you can use with IVI drivers.

When used in interactive mode, simulation drivers have pop-up user interface panels so developers can interactively configure the data generated. With IVI drivers, you can check the status of an instrument after every function that interacts with the instrument without adding extra VI calls.