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IVI – National Instruments
In contrast, IVI labview ivi use state caching to eliminate redundant commands. By defining standards for each of these functions, IVI makes it possible for you to develop test programs that can labview ivi with any function generator.
With state caching, only the frequency parameter is labview ivi to the instrument each time you run the VI. Using the Class Browser. When the VI performs a frequency sweep, only ovi frequency parameter changes. To make state caching work properly, the IVI Engine must store the coerced value in the cache. Calls to these high-level VIs often result in transmission of redundant labview ivi to the instrument.
An example of how to access the help for the Initialize method is shown in Figure 9.
Using IVI Drivers in LabVIEW – National Instruments
Right-click Logical Names and select Create New case sensitive. State Caching IVI drivers maintain the physical state of instruments in a software cache to increase the efficiency and speed labview ivi instrument drivers. Figure 3 illustrates this configuration.
Links to complete examples demonstrating how to execute the Measurement method and read the measured value are provided at the end of this document. For instrument drivers that support a family of instruments, you can also use the labview ivi string to set the particular model of instrument that you want the driver to emulate.
Sets internal structure Sets programmatic interface of similar labvie Divides instruments into functional classes such as oscilloscopes labview ivi digital multimeters Establishes the characteristics of each class of instruments The IVI Foundation also specifies the programmatic interface for these different classes of instruments.
Introduction Instrument drivers—software modules that control programmable instruments—have advanced technologically in labview ivi ways. Labview ivi are now ready to run the example program using the same logical name but a different instrument.
Along with using MAX, IVI becomes even more powerful because iiv enables you to change settings outside of the application.
Note If the actual instruments are connected to your system, you can run the same examples with simulation disabled. Select the labview ivi type library you selected for the Automation Open refnum.
Simply replace the resource name string with fl To verify the values you are planning to send the lagview, while you develop the test application. Although the interface to each driver VI is the same, IVI customizes the labview ivi operation of each function in the iivi for the specific instrument. 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.
This virtual labview ivi allows you to set up a number of different instrument driver configurations that test applications lavbiew easily access using the resource name string. If labview ivi enter an incorrect value, IVI drivers return an error through the error out indicator. The key to state management in IVI drivers is the IVI Engine, which controls the reading and writing of attributes to and from instruments.
To achieve interchangeability, the IVI Foundation has defined specifications for the following thirteen instrument classes: To reduce any discrepancies, the ivvi coerces or rounds values to the actual labview ivi that the instrument uses internally.
Using an IVI-COM Instrument Driver in LabVIEW
Rate this document Select a Rating lwbview – Poor 2 labview ivi 4 5 – Excellent. IVI drivers maintain the physical state of instruments in a software cache to increase the efficiency and speed of instrument labiew. The new technologies introduced with IVI drivers maintain the benefits labview ivi traditional drivers while adding features that improve the application development process and application performance. You labview ivi call the Get Next Coercion Record VI, which accesses the coercions by retrieving and clearing the oldest recorded instance.