Instrument driver calls — The simplest form of simulation is the ability to make calls to an instrument driver when the instrument is not connected to the computer. By defining standards for each of these functions, IVI makes it possible for you to develop test programs that can work with any function generator. In addition to instrument interchangeability, users can also simulate their instrumentation hardware with IVI drivers. To make state caching work properly, the IVI Engine must store the coerced value in the cache. You can download these resources from ni.
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Three Types of Simulation. When used in conjunction with a specific driver, the specific driver performs the range-checking level of simulation ensuring that each value the program is attempting to send to the instrument is within valid limits for that instrumentand the simulation driver performs the data generation operation as described above.
In Figure 7notice that the sessions to the DCVoltage interface and to the driver session are closed after they are used. The IVI technology establishes a standard instrument-driver architecture with built-in mechanisms for enabling simulation igi simulated data.
Using IVI Drivers in LabVIEW – National Instruments
Instrument drivers specify the instrument driver DLL while the hardware asset properties specify the resource name to access a physical device.
Introduction Instrument drivers—software modules that control programmable instruments—have advanced technologically in many ways. Make sure the option string is empty when you use the MAX approach. The IVI Engine checks the status of an instrument only after a function writes an attribute to, or reads a value from, an instrument. The IVI class specification: Because Plug and Play drivers maintain a common architecture and interface, you quickly and easily connect to and communicate with your instruments with very little or no code development.
In contrast, IVI drivers use state caching to eliminate redundant commands. Instrument drivers labvuew an indispensable tool to help you rapidly develop test and measurement applications.
Under the General tab, you can enable or disable initialization options.
After you configure the IVI driver with the IVI features you want state caching, range checking, simulation, status checking, or recording coercions you continue developing an application as you do with a traditional LabVIEW instrument driver.
The IVI Engine uses these settings when it runs your test application.
Simply replace the resource name string with fl When used in interactive mode, simulation drivers have pop-up user interface panels so labviiew can interactively configure the data generated.
From your test program, you make calls to the class drivers, which in turn communicate through the specific drivers for your instruments.
For example, generate a value of 3. Certified Plug and Play instrument drivers are technically supported by National Instruments, while Plug and Play instrument drivers are supported by instrument vendors or other third parties. An instrument driver is a set of software routines that control a programmable instrument.
Each instrument driver function call requires a valid instrument handle as an input parameter. Back to Top 2. You can call the Get Next Coercion Record VI, which accesses the coercions by retrieving and clearing the oldest recorded instance. A digital multimeter DMM instrument might accept a value from 1.
Using IVI Drivers to Simulate Your Instrumentation Hardware in LabVIEW and LabWindows/CVI