Driver Sessions consist of an instrument driver software module, general property settings, and, when you are not in simulation mode, a hardware asset. Each of these simulation drivers plugs into the generic class driver to perform more flexible data generation when drivers are used in simulation mode. Using IVI drivers, test engineers can reuse their test programs with different instruments. Every IVI instrument-specific driver has basic built-in simulated data generation algorithms. The specific instrument drivers contain the information for controlling a particular model of an instrument, including the command strings, parsing code, and valid ranges of each setting for that particular instrument. Introduction Instrument drivers—software modules that control programmable instruments—have advanced technologically in many ways. Select fl45 from Driver Session as shown in the following figure.
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Therefore, instead of letting the instrument coerce the value, the IVI driver coerces the value before it sets the instrument. You set up virtual channel names in the properties of a driver session.
If you enable Record Value Coercions and never use Labvisw Next Coercion Record VI to retrieve and clear those coercion records, the records build up and could eventually overflow your computer memory. 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:.
Fluke 45 Dual Display MultiMeter – Instrument Driver – National Instruments
Before discussing the technical details of how simulation works, it is important that you have a clear understanding of the various levels of simulation possible with instruments.
This range-checking operation happens completely in software in the specific driver. This code will be useful only for that particular instrument-specific driver. Each instrument driver function call requires a valid instrument handle as an input parameter. Back to Top 2.
While the document is well-structured, it doesn’t help me much since the new MAX is quite different. You can configure IVI drivers settings independently of a test application. Therefore, if you are unfamiliar with instrument drivers, a particular function, or just want to test various values, you can run the function by clicking on the run button white arrow. To disable a feature, you set its value to 0. You should develop an application with IVI instrument drivers in the same way that you develop applications with traditional LabVIEW drivers, except that you can also take advantage of the new IVI features described in this.
Therefore, you can enable and disable simulation without changing your program. Note that the change from state 1 to state 2 happens only after initiating a connection in Tera Term or the VISA panel; so, I believe that I am experiencing an issue where LabVIEW is unable to acquire a communication lock with the serial instrument.
The specific drivers contain information for controlling a specific instrument, such as command strings, parsing code, and valid ranges for instrument settings. This document describes how to use the IviDmm class driver with the hpa and fl45 specific drivers; however, you can use these instructions as a guideline for using other examples and drivers.
Using IVI Drivers in LabVIEW
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 checks the status of an instrument only after a function writes an attribute to, or reads a value from, an instrument. And yes, I have reset the hardware as well as the software multiple times to ensure that I don’t have resources competing for COM1.
Each of these simulation drivers plugs into the generic class driver to perform more flexible data generation when drivers are used in simulation mode.
Using IVI Drivers in LabVIEW – National Instruments
Previous LabVIEW drivers indicated the valid ranges for settings indirectly through the online documentation for each control. Therefore, you can develop very robust simulated data generation algorithms for your test systems and labciew them into the simulation drivers.
These two drivers must be from the same class. Three Types of Simulation. Message 3 of The IVI class specification: Restart the computer after installing the software. 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 f,uke within valid limits for that instrumentand the simulation driver performs the data generation operation as described above.
However, we believe that simulated data is very application specific.
Are you closing the VISA resource at the end which would release the port? Status checking in IVI drivers is enabled by default so that you can verify your applications during development.
IVI drivers include two distinct initialization VIs. Virtual labvifw names are simply aliases for specific driver channel names. Note If you receive an error message after you change the configuration, the configuration settings probably do not match those of HP A DMM.