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Overview of Instrument Drivers An instrument driver is a set of software routines that control a programmable instrument. Each routine corresponds to a programmatic operation such as configuring, reading from, writing to, and triggering the instrument. Instrument drivers simplify instrument control and reduce test program development time by eliminating the need to learn the programming protocol for each instrument. National Instruments provides instrument drivers for a wide variety of instruments; these instrument drivers are written in and/or and use either the Virtual Instrumentation Software Architecture (VISA) or the Interchangeable Virtual Instrument (IVI) protocol.
Using an Instrument Driver in LabVIEW In LabVIEW, an instrument driver is a set of VIs that communicates with an instrument. Each VI corresponds to a programmatic operation, such as configuring, reading from, writing to, and triggering an instrument. LabVIEW instrument drivers simplify instrument control and reduce test program development time by eliminating the need for you to learn the complex, low-level programming commands for each instrument. Where to Find Instrument Drivers and How to Download Them You can find and download instrument drivers using the NI Instrument Driver Finder or the (IDNet). Use the NI Instrument Driver Finder to find, download, install, and access LabVIEW Plug and Play drivers for an instrument. Select Tools»Instrumentation»Find Instrument Drivers to launch the Instrument Driver Finder. This tool searches IDNet to find the specified instrument driver.
Refer to the figure below to see how to launch the NI Instrument Driver Finder from LabVIEW. Launching the NI Instrument Driver Finder The alternative to using the NI Instrument Driver Finder is to go directly to the and search for your instrument driver there. LabVIEW Instrument Driver VIs and Examples In LabVIEW 2010 and later, after the instrument driver installs, you can use the Instrument Driver Finder to access the instrument driver VIs. You also can use the Instrument Driver Finder to open example programs covering everything from analysis and presentation to using your instrument driver. NI Instrument Driver Finder in LabVIEW 2017 Once a driver has been installed, you can access the instrument driver from the Instrument I/O palette. For example, open the Agilent 34401 instrument driver that ships with LabVIEW from the Instrument I/OInstrument DriversAgilent 34401 palette.
Labview Serial Communication
The following figure shows this palette and some of the VIs and subpalettes that are shipped with it. Agilent 34401 Palette Many instrument drivers have a VI Tree VI you can use to view the entire instrument driver hierarchy.
The VI Tree VI is a nonexecutable VI that illustrates the functional structure of the instrument driver. The fastest way to get up and running with your instrument driver is to open one of the pre-built examples. For project-style instrument drivers, you can find these in the example finder under Hardware Input and OutputInstrument DriversLabVIEW Plug and Play. For other instrument driver types, the examples will be available from the Application Examples subpalette from the corresponding instrument driver. In the following figure we have opened the Agilent 34401 Read Multiple Measurements.vi example that comes with the Agilent 34401 instrument driver.
This example shows how to configure a measurement and take multiple readings. Agilent 34401 Read Multiple Measurements Front Panel In this example, serial communication is used. On the front panel, there are controls for the VISA resource name, the Serial Configuration, the type of Function, the Sample Count, and the Timeout. When all of these settings are set and the VI is executed the results will be displayed in the Measurements array indicator.
Agilent 34401 Read Multiple Measurements Block Diagram From the block diagram you can see that the instrument is first initialized with the Serial Configuration and VISA resource name specified on the front panel. Then the Configure Measurement VI is called to set the instrument up for the desired measurement. The Configure Autozero VI is also used which configures the instrument’s autozero setting. Enabling autozero optimizes the instrument for accuracy, while disabling optimizes for speed. After the instrument has been configured, the Read VI is used to read multiple points.
Once the measurement is complete, the Close VI is called which performs an instrument error query and terminates the software connection to the instrument. Finally, the Simple Error Handler is called which indicates whether an error occurred. Instrument Driver Organization Once an instrument driver has been downloaded, the instrument driver VIs will be located on the Instrument Drivers palette. Most instrument drivers have menu palettes that include the following components.
The Initialize VI- the first instrument driver VI you call, establishes communication with the instrument. Additionally, it can perform any necessary actions to place the instrument in its default power on state or in another specific state. Generally, you need to call the Initialize VI only once at the beginning of an application. The Configuration VIs- a collection of software routines that configure the instrument to perform the operation you want. Numerous Configuration VIs can exist, depending on the particular instrument.
After you call these VIs, the instrument is ready to take measurements or to stimulate a system. The Action VIs - initiate or terminate test and measurement operations, such as arming the trigger system or generating a stimulus. Action VIs are different from Configuration VIs because they do not change the instrument settings but order the instrument to carry out an action based on its current configuration.
The Status VIs obtain the current status of the instrument or the status of pending operations. The Data VIs- transfer data to or from the instrument.
Examples include VIs for reading a measured value or waveform and VIs for downloading waveforms or digital patterns to a source instrument. The Utility VIs- perform a variety of operations that are auxiliary to the most often used instrument driver VIs. These VIs include the majority of the instrument driver template VIs, such as reset, self-test, revision, error query, and error message. The Utility VIs might also include other custom instrument driver VIs that perform operations such as calibration or storage and recall of setups. The Close VI- terminates the software connection to the instrument and frees system resources. Generally, you need to call the Close VI only once at the end of an application or when you finish communication with an instrument. Make sure that for each successful call to the Initialize VI, you use a matching Close VI to avoid maintaining unnecessary memory resources.
You can use an instrument driver for a particular instrument as is. However, LabVIEW Plug and Play instrument drivers are distributed with their block diagram source code, so you can customize them for a specific application. You can create instrument control applications and systems by programmatically linking instrument driver VIs on the block diagram. Related Links. Kommentare.
Hello friends, hope you all are fine and enjoying good health. Today’s post is my first post on LabView Software.
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I have worked on LabView quite a lot in past but these days I am continuously working on LabvView so I thought to write some tutorials on it. In today’s tutorial, I will explain in detail How to get continuous data from COM Port in LabView software.
LabView is a very handy tool for the engineers. One can easily plot graphs and can work on different hardware modules with it. One of the best feature of LabView is its extensive help desk. There are many examples present in it which are ready to run and can help a lot, moreover their online is also very extensive. I got into many problems while working on it and I never get stuck, I just searched online and got the solutions for my problems.
So, my suggestion is, if you are working on LabView then give Google a chance to help you out, if you stuck in something. Let’s start today’s post, in today’s post we will receive data from serial port and show it in LabView software.
In order to do so, first of all you need to download LabView software, you can easily download it from their official website. They offer a trial period of around 45 days for the students and after that you have to buy it.
Now, follow the below steps carefully and if you find any trouble anywhere, let me know in comments and I will try my best to sort them out. Steps to Follow. First of all, you need to download the. NI VISA driver is used for serial communication, without downloading this software you can’t communicate with the serial port of your computer in LabView. LabView has extensive list of drivers, whenever you want to communicate with any hardware in LAbview then you have to download its driver, NI VISA is the driver for communicating with serial port.
After downloading this driver, install it and now run your LabView software. When you run LabView, it will appear as shown in the below figure. Note:. I have given the complete working vi to download at the end but I suggest that you should design it by yourself so that you learn how to design. Now, click on the Create Project Button and the below Window will pop up. Now click on the Blank VI Template and click Finish. A blank vi will open up, we will design the complete project in this vi.
These are two windows, one is called the Block Diagram, where we will place all the components and the second one is Front Panel, where user can interact with LabView i.e. The Serial data coming will be displayed in the Front Panel.
Another small window will also be there, this window is used for getting blocks. Now design a vi as shown in the below figure. Note:. If you don’t select the correct Com Port then it will give error and won’t run so select the correct COM Port name. Now, the COM Port I am using is COM5 and you can see Start Reading button is also ON. Living on the edge of time yuksek download firefox.
It will allow you to see for yourself the convenience and advantages of this program.
Response is showing the complete data whatever is coming from the Serial Port, while the Data 1D is splitting the data and showing each data in each box and the separation character I selected is “,” (comma).That’s all for today, now play with the vi and I hope you will find it really amusing. In order to download the complete working vi click on the below button. In the next post, I have discussed how to.Displaying data on graph is usually required in most of the projects. So have a look at it.
C o n f i g u r a t i o n: - u s e d t o o p e n u p t h e s e r i a l p o r t w i t h t h e s p e c i f i e d o r d e f a u l t p a r a m e t e r s W r i t e: - u s e d t o w r i t e t h e s t r i n g t o t h e o u t p u t b u f f e r o f t h e s e r i a l p o r t R e a d: - u s e d t o r e a d t h e s t r i n g d a t a f r o m t h e i n p u t b u f f e r f o r t h e s p e c i f i e d b y t e c o u n t C l o s e: - u s e d t o c l o s e t h e p o r t a n d r e l e a s e t h e r e s o u r c e s a s s o c i a te d w i th th e p o rt.
Dear friend,i am working on a project where i have a gwinstek GDM-396 multimeter to be conneted to an RS 232 port. Watever voltage is recorded from the multimeter should be trasmitted on a waveform chart in labview. I have written a labview program but i am always getting a 0 output.i have already set the parameters(parity,baud rate.) of the multimeter in the labview also.
I am quite new to labview. Help me please to get that output voltage in labview. Please find attached my program.i am using labview 7.0. Dear friend,i am working on a project where i have a gwinstek GDM-396 multimeter to be conneted to an RS 232 port. Watever voltage is recorded from the multimeter should be trasmitted on a waveform chart in labview. I have written a labview program but i am always getting a 0 output.i have already set the parameters(parity,baud rate.) of the multimeter in the labview also. I am quite new to labview.
Help me please to get that output voltage in labview. Please find attached my program.i am using labview 7.0.
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