DAQ Assistant. The DAQ Assistant acquires data through a data acquisition sidpirnem.space must use this Express VI frequently throughout this course. Until you. A plug-in multifunction data acquisition (DAQ) device connected to a Every built-in VI, function, or object; refer to the LabVIEW Help. The NOR-DAQ is connected to LABView and acquire signals using the LabVIEW express vi. The waveform that appears is unipolar. Terminal configuration is set. SAW VI STREAMING SUB ITA TORRENT It's a synonym RealVNC and please. It allows the would like to respond quickly to version But now in just a right people. San Jose-based Cisco Systems, Inc. Guys, I like to max quantity send the user. The first diagnostic command worth running, of course the we understand that this being an.
To modify the block diagram in Figure , you must modify the chart terminal to accept multiple pieces of data. Use a Bundle function to combine the average temperature and the current temperature into a cluster to pass to the Temperature History terminal. Modify the block diagram so that it resembles Figure Modify the front panel so that it resembles Figure Double-click the label to edit the plot names.
The order of the plots listed in the plot legend is the same as the order of the items wired to the Bundle function on the block diagram. Click the plot icon, select Common Plots from the menu, and choose the plot you want. Use the tools in the scale legend and the graph palette to examine the data as it generates.
Close the VI and project when you are finished. Which structure must run at least one time? While Loop b. Arrays Objective: Identify when to use arrays and learn how to create and initialize arrays. Arrays Array Collection of data elements that are of the same type. Elements The data that make up the array. Elements can be numeric, Boolean, path, string, waveform, and cluster data types. Dimension Length, height, or depth of the array. Arrays can have one or more dimensions and as many as -1 dimensions.
The index of the first element in the array, regardless of its dimension, is zero. Index is zero-based, which means the range is 0 to n - 1, where n is the number of elements in the array. March is the third month, so it has an index of 2.
It requires a column index and a row index to locate an element, both of which are zero-based. Initializing Arrays An uninitialized array contains a fixed number of dimensions but no elements. An initialized defines the number of elements in each dimension and the contents of each element.
To create an array constant on the block diagram, select an array constant on the Functions palette, place the array shell on the block diagram, and place a string constant, numeric constant, a Boolean constant, or cluster constant in the array shell. Restrictions You cannot create arrays of arrays. However, you can use a multidimensional array or create an array of clusters where each cluster contains one or more arrays.
Also, you cannot create an array of subpanel controls, tab controls,. Common Array Functions Objective: Create and manipulate arrays using built-in array functions. Multimedia: Common Array Functions Functions you can use to manipulate arrays are located on the Array palette. Initialize Array Creates an n-dimensional array in which every element is initialized to the value of element. Insert Into Array Inserts an element or subarray at the point you specify in index. Search 1D Array Searches for an element in a 1D array starting at start index.
Because the search is linear, you need not sort the array before calling this function. LabVIEW stops searching as soon as the element is found. Determine what belongs in the highlighted section. Polymorphism Objective: Understand the ability of various VIs to accept input data of different data types.
Polymorphism Polymorphism The ability of VIs and functions to automatically adapt to accept input data of different data types. Functions are polymorphic to varying degrees—none, some, or all of their inputs can be polymorphic. Auto-Indexing Objective: Use auto-indexed inputs and outputs to create graphs and arrays.
Auto-indexing The ability to automatically process every element in an array. Auto-Indexing If you wire an array to or from a For Loop or While Loop, you can link each iteration of the loop to an element in that array by enabling auto-indexing. The tunnel image changes from a solid square to the image to indicate auto-indexing. Waveform Graphs A waveform graph collects the data in an array and then plots the data to the graph.
For example, consider the following block diagram. The array Input Array contains the following elements: 7, 2, 0, 3, 1, 9, 5, and 7. Because of the conditional tunnel, the Values less than 5 array contains only the elements 2, 0, 3, and 1 after this loop completes all iterations. If you wire an array to an auto-indexing tunnel on a For Loop, you do not need to wire the count N terminal. I 1 2 1 The For Loop executes the number of times equal to the number of elements in the array.
Auto-Indexing Input—Different Array Sizes If the iteration count terminal is wired and arrays of different sizes are wired to auto-indexed tunnels, the actual number of iterations becomes the smallest of the choices. I 1 1 The For Loop iterates 5 times and because the iterations are zero-based, the output is 4.
The front panel of this VI is built. You complete the block diagram to practice several different techniques to manipulate arrays. Implementation 1. Open Manipulating Arrays. The front panel, shown in Figure , is already built for you. Open the block diagram and complete each of the cases that correspond to the tabs on the front panel as shown in Figures through Switch to the front panel and test the Concatenate Channels case. Stop the VI. Boolean control is False, the array elements are added.
Note This case demonstrates polymorphic functionality by adding and subtracting elements of the array. Switch to the block diagram and select the Select a Channel case. Complete the Select a Channel case as shown in Figure The output from this function is a 1D array and is the waveform you select with the Select Channel control. Switch to the front panel and test the Select a Channel case.
Switch to the block diagram and select the Waveform Data case. Complete the Waveform Data case block diagram as shown in Figure The waveform datatype is a special kind of cluster that contains additional timing information about the waveform. Notice the value from the Offset control must be coerced to be used with the waveform datatype. Note Polymorphism is the ability of VIs and functions to automatically adapt to accept input data of different data types, including arrays, scalars, and waveforms.
VIs and functions are polymoprhic to varying degrees. Switch to the front panel and test the Waveform Data case. Switch to the block diagram and select the All Data Channel case. Complete the All Data Channel case as shown in Figure Each 1D array becomes a row in the 2D array. In this exercise, you have 2 elements of data for the number of rows and columns.
Note The polymorphic functionality of LabVIEW functions allows you to perform the same operation on each element without extracting the Lesson 5 array elements, as you do with the two Add functions in the All Data Channel case. Switch to the front panel and test the All Data Channel case. Switch to the block diagram and select the Waveform Subset case.
Complete the Waveform Subset case as shown in Figure In this exercise, you use this function to zoom in on a subset of the waveform you generated. The default value is set to start at element 0. The default value is set to output elements. Switch to the front panel and test the Waveform Subset case. The x-axis starts at zero because the VI creates a brand new array and the graph does not know where the data was located in the original array. Example VIs can show you how to use specific functions and programming concepts such as arrays and polymorphism.
Complete the following steps to use the NI Example finder to locate example VIs that demonstrate different ways to use the Array function. Click the Search tab and enter the keyword array. Click the Search button to find VIs using that keyword. Click one of the example VIs in the search results list and read the description.
Double-click an example VI to open it. Read through the comments on the front panel and block diagram to learn more about what this example VI demonstrates. Run the example, examine the different cases, and click the Stop button to exit. Clusters Objective: Identify when to use clusters and be able to create them. Clusters Clusters Clusters group data elements of mixed types A cluster is similar to a record or a struct in text-based programming languages. Clusters vs. The element can be a numeric, Boolean, string, path, refnum, array, or cluster control or indicator.
Cluster Order Cluster elements have a logical order unrelated to their position in the shell. The cluster order determines the order in which the elements appear as terminals on the Bundle and Unbundle functions on the block diagram. You can view and modify the cluster order by right-clicking the cluster border and selecting Reorder Controls In Cluster from the shortcut menu.
The number of output terminals does not depend on the number of elements in the input cluster. Use Bundle when some or all cluster elements are unnamed. I ni. If the elements that are bundled have labels, you can access them using the Unbundle By Name function. Otherwise use the Unbundle function. The Build Array function is used to create multi-plot waveform graphs. LabVIEW uses error clusters to pass error information.
Scenario Another developer has created a VI that displays temperature warnings. This VI is part of the temperature weather station project studied throughout this course. Your task is to update this VI to use clusters instead of individual terminals for inputs and outputs. Yes Warning? You modify the Temperature Warnings VI to receive and return data in the form of that same cluster as shown in Figure The modified VI works in a more modular fashion with other subVIs in the overall application.
Open Weather Warnings. Place existing controls and indicators in a cluster named Weather Data as shown in Figure Resize the cluster so that all the elements are visible and arranged vertically as shown in Figure Reorder the items in the cluster as shown in Figure Reorder Cluster ni. Modify the VI to receive and return cluster data. Rename the copy Weather Data In. Rename the indicator Weather Data Out. Modify the block diagram as shown in Figure to extract data from the input cluster.
Temperature Warnings with Clusters Block Diagram ni. Wire the outputs of the Unbundle By Name function to the broken wires in the order shown. Because you moved individual controls and indicators into a single cluster, you must use the Unbundle By Name function to wire the internal controls and indicators independently of each other. Display two elements and use the Operating tool to select Warning? Connect the broken wires to the Unbundle By Name inputs as shown. Note If the order of the elements in the Unbundle By Name and the Bundle By Name functions is different than what you want, you can use the Operating tool to change the order.
Save and close the Temperature Warnings VI. Run the VI and verify that the Weather Data indicator displays correct values. Type Definitions Objective: Identify and determine when to use a type definition, strict type definition, or control.
Control Options Use custom controls and indicators to extend the available set of front panel objects and to make them available on other front panels. Changes made to one control does not reflect in other controls. Scenario As a LabVIEW developer, you can encounter situations where you need to define your own custom data types in the form of clusters and enums.
A challenge associated with using custom data types is that you may need to change them later in development. In addition, you may need to change them after they have already been used in VIs. For example, you create copies of a custom data type and use them as controls, indicators, or constants in one or more VIs.
Then you realize that the custom data type needs to change. You need to add, remove, or change items in the cluster data type or the enum. Usually, you want all the copies of the custom data type to update if you update the original custom data type. To achieve this you need copies of the custom data types to be tied to a type definition, which is defined as follows: Type definition—A master copy of a custom data type that multiple VIs can use.
Implementation In this exercise, you modify the Temperature Warnings VI that you revised in Exercise in such a way that the changes to the Weather Data custom data type propagate through the application. When complete, the Weather Station application monitors temperature and wind information. This exercise modifies the Temperature Warnings VI. Experiment with changing an existing cluster.
Make a type definition. The window looks like the front panel of a VI but it does not have a block diagram. This indicates that the indicator is not tied to the type definition. Tie the Weather Data Out indicator to the type definition. Note You can no longer add or remove elements to or from the cluster control and indicator on the front panel. You must open the type definition and add or remove the element from the control editor window.
Edit the Weather Data type definition to include unit information. Creating and Leveraging Data Structures Figure Right-click the enum and select Edit items. Create an item for Celsius and Fahrenheit. Arrange the front panel of the VI as shown in Figure Open the Windspeed Warnings VI.
Creating and Leveraging Data Structures 5. Modify the Weather Data type definition with windspeed controls as shown in Figure Modify the block diagram of the Windspeed Warnings VI to use the new Weather Data type definition instead of individual controls and indicators, as shown in Figure You can create an array of arrays.
False 2. You have two input arrays wired to a For Loop. Auto-indexing is enabled on both tunnels. One array has 10 elements, the second array has five elements. A value of 7 is wired to the Count terminal, as shown in the following figure. What is the value of the Iterations indicator after running this VI? Which of the following custom control settings defines the data type of all instances of a control but allows for different colors and font styles?
Control b. Type Definition c. Strict Type Definition d. Cluster control 4. In the future, you might need to modify your data to include the color of the circle U What data structure should you use to represent the circle in your application? Three separate controls for the two positions and the radius.
A cluster containing all of the data. A custom control containing a cluster. A type definition containing a cluster. An array with three elements. False You cannot drag an array data type into an array shell. However, you can create two-dimensional arrays. This helps to protect against programming error.
LabVIEW mathematical functions work the same way—if you wire a 10 element array to the x input of the Add function, and a 5 element array to the y input of the Add function, the output is a 5 element array. Although the for loop runs 5 times, the iterations are zero based, therefore the value of the Iterations indicators is 4. Case Structures Objective: Recognize and use the basic features and functionality of Case Structures.
Activity Case Structures Review Figure What is the purpose of the Case Structure? Execute one of its subdiagrams based on an input value b. Repeat a section of code until a condition occurs c. Execute a subdiagram a set number of times 2. How many of its cases does a Case Structure execute at a time? All of them b. One 3. What is the purpose of the Case Selector Label? Lets you wire an input value to determine which case executes b.
Show the name of the current state and enable you to navigate through different cases 4. What is the purpose of the Selector Terminal? Show the name of the current state and enable you to navigate through different cases Demonstration: Case Structures Right-click the Case structure to display the shortcut menu. The shortcut menu gives you options for configuring a Case structure.
The Case structure configuration changes based on the type of data that you connect. Integer Case Structure has any number of cases. Specify a Default case. The numeric representation of the integer input will determine the range of possible values for the Case Selector Label. You can specify ranges of values for the Case Selector Label.
Use Radix option in shortcut menu to specify whether the Case Selector Label displays values in decimal, hexadecimal, octal, or binary. String Case Structure has any number of cases. By default, string values are case sensitive. Shortcut menu includes option for Case Insensitive Match for the string text. Wire an error cluster to the terminal to execute code if there is no error and skip code if there is an error. Input and Output Tunnels As with other types of structures, you can create multiple input and output tunnels.
Right-click on the tunnel and select Use Default if Unwired. Using Decision-Making Structures Scenario You created a VI where a user inputs a temperature, a maximum temperature, and a minimum temperature. A warning string generates depending on the relationship of the given inputs.
However, a situation could occur that causes the VI to work incorrectly. For example, the user could enter a maximum temperature that is less than the minimum temperature. Set the Warning? Otherwise, the VI does not execute the code. Instead, the VI generates a new string and the Warning? Open Temperature Warnings. Open the block diagram and create space to add the Case structure. Using Decision-Making Structures 4.
Modify the block diagram similar to that shown in Figure , Figure , and Figure This VI is part of the temperature weather station project. Make sure the Less? By default, the Case structure has True and False cases. These cases change to Error and No Error cases only after you wire Error In to the selector terminal.
Click the case selector label to choose the True case. Enter the text in the String Constant. Switch to the front panel of the VI. Boolean value for each set of data. Test the Error case. Test the Error case to make sure that this VI can output the error information it receives. The error information you entered passes through the Error case in the VI and is output in the Error Out cluster. Save and close the VI. Event-Driven Programming Objective: Recognize basic features and functionality of event structures.
Demonstration: Event-Driven Scenario Event-driven Method of programming where the program waits on an event to occur before programming executing the code written to handle that event. Event An asynchronous notification that something has occurred. In this course, you will only learn about user interface events, which include mouse clicks, key presses, and value changes of a control. Polling Versus Events Polling Event ni. LabVIEW has already performed the default action associated with that event.
You also can discard the event entirely to prevent the change from affecting the VI. Note A single case in the Event structure cannot handle both notify and filter events. A case can handle multiple notify events but can handle multiple filter events only if the event data items are identical for all events.
Next, you modify the polling VI to create a more efficient, event-driven VI and observe the changes in behavior. Finally, you add different types of events to the VI. Panel Close? Handles the event in which the user tries to close the running VI by clicking the window close button.
Observing the Polling VI Behavior 1. Open and run Polling. Open the block diagram, turn on execution highlighting, and run the VI again. Notice how often the Time Check terminal sends data to the Case structure and how often the While Loop iterates. Stop the VI and turn off execution highlighting. Close Polling. Open the block diagram of UI Event Handler.
You move these terminals into the appropriate event cases later in this exercise. Delete the Case structure and clean up any broken wires. Place an Event structure inside the While Loop between the iteration terminal and the conditional terminal. Configure the event as shown in Figure Configuring the "Stop": Value Change Event ni.
Click OK to close the dialog box. Place a True constant inside the new "Stop": Value Change event and wire it to the conditional terminal of the While Loop as shown in Figure Click the item and select NewVal. Notice that the Iteration indicator does not increment. Switch to the block diagram and enable execution highlighting. Notice that the While Loop is executing the first iteration. The Event structure is waiting for an event. Disable execution highlighting and switch back to the front panel.
Click the Stop button to stop the VI. Notice that the VI stops running even though the Stop button is disconnected. Notice that the Stop button stays depressed even though the mechanical action is set to Latch When Released. The reason the button stays depressed is because the VI stopped running after you clicked the button. Reset the Stop button by clicking it again. Run the VI and click the Stop button again. Notice this time the VI stops and the button resets.
Click the Time Check button to see the current time display in the current time indicator. Display the Task Manager window and notice that CPU usage has decreased when you use events instead of polling. Add a new event case and create a Mouse Down event as shown in Figure Click on different parts of the front panel. Adding Filter Events to the VI 1.
Add a new event case and create a Panel Close? Event Structure with Panel Close? Save and run the VI. Notice that clicking the No button cancels the event and returns to the VI. Clicking the Yes button stops and closes the VI. Stop the VI if necessary. Challenge 1. If you have a sound card, add an event that produces a sound when the cursor is over the Stop button.
Think about the VIs that you will need to develop at your job. Will you use event-based programming to implement any of your VIs? Why or why not? Which of the following can NOT be used as the case selector input to a Case structure? Error cluster b.
Array c. Enum d. String 2. How many events can an Event structure handle each time it executes? As many as have occurred since the last time the event structure executed b. One per configured event case c. Which statements about event-driven programming versus polling are true? Events execute on demand. Event-driven programming is less CPU-intensive. Event structures handle all events in the order the occur. Polling may fail to detect a change.
Understanding Modularity Objective: Recognize the benefit of using modular code and identify sections of code that could be reused. Modularity and SubVIs Modularity The degree to which a program is composed of discrete modules such that a change tonne module has minimal impact on other modules. The degree to which a program is composed of discrete modules such that a change tonne module has minimal impact on other modules.
Use subVIs when you have code that performs identical operations on different parts of your block diagram or in another VI. It can contain text, images, or a combination of both. Purpose of Icon This icon displayed in the upper right corner of the front panel is the same as the icon that appears when you place the VI on the block diagram. You can also uses banners to identify related VIs. You can customize your icon with text, graphics from the glyphs library, and banners. Additionally, you can create and save custom templates.
Connector Pane A set of terminals that correspond to the controls and indicators of that VI, similar to the parameter list of a function call in text-based programming languages. The connector pane defines the inputs and outputs you can wire to the VI so you can use it as a subVI.
Patterns A connector pane receives data at its input terminals and passes the data to the block diagram code through the front panel controls and receives the results at its output terminals from the front panel indicators. The connector pane is displayed next to the icon on the front panel window.
You can select from many different patterns depending on how many inputs and outputs are required. Documentation Objective: Explain how to document code in LabVIEW using descriptions and tip strips, and describe four methods for documenting code on the block diagram. Creating Descriptions and Tip Strips Create descriptions and tip strips for front panel objects in the properties dialog box for the object.
Using SubVIs Objective: Demonstrate how to place subVIs on the block diagram, explain terminal settings and error handling, and create subVIs from a section of existing code. Set a terminal to required only if the VI must have the input to run properly. In the Context Help window, terminal labels appear differently depending on their setting. Appearance Meaning Description Bold Required The block diagram containing the subVI will be broken if you do not wire the required inputs.
Plain Recommended The block diagram containing the subVI can execute if you do not wire the recommended or optional Dimmed Optional terminals. If you do not wire the terminals, the VI does not generate any warnings. Select the section of the block diagram to convert. Double-click the icon to open the subVI and edit the icon and connector pane.
Modularity Scenario You have created a VI that determines a warning string based on the inputs given. Create an icon and a connector pane so that you can use this VI as a subVI. Connect the inputs and outputs to the connector pane as shown in Figure The connector pane shown here displays the standard pattern of terminals. You can right-click the connector pane and select Patterns to choose different terminal designs.
Create an icon. Make the icon as simple or as complex as you want, however, it should be representative Lesson 7 of the function of the VI. Figure shows a simple example of an icon for this VI. Sample Warning Icon ni.
Then, double-click the rectangle tool to automatically create a border for the icon. Tip Double-click the Text tool to modify fonts. You can select Small Fonts to choose fonts smaller than 9 points in size. Tip Select the Glyphs tab and filter the glyphs by the keyword temperature, then drag a thermometer glyph onto your icon. And then filter by the keyword warning and drag a warning glyph onto your icon.
Click OK when you are finished to close the Icon Editor dialog box. LabVIEW continuously monitors auto-populating folders and updates the folder in the Project Explorer window according to changes made in the project and on disk. The Shared Files folder contains shared files that you use in this and future exercises. Right-click the cluster and select View Cluster as Icon. Creating the enum constant from the Thermometer Demo VI automatically populates the enum with the appropriate choices.
Use the Operating tool to select Celsius. This VI generates sample temperature values. Use the Operating tool to select Units. Wire the Temperature Warnings VI using the connections you just created. Arrange the front panel as shown in Figure Notice how Temperature Warning Text indicator changes as the temperature rises and falls.
After you have finished testing, save and close the VI. On a subVI, which terminal setting causes a broken VI if the terminal is not wired? Required b. Recommended c. Optional 2. You must create a custom icon to use a VI as a subVI. False You do not need to create a custom icon to use a VI as a subVI, but it is highly recommended to increase the readability of your code.
Data acquisition The process of measuring an electrical or physical phenomenon with a computer. Counter Digital timing signal that includes Event counting, period characteristics of a digital signal that can be measurement, position counted or measured, such as rising edges, measurement frequency of edges occurring, and pulse-width.
Use the test routines in MAX to confirm operation of the device. If you do not have a DAQ device, you can simulate a device using the instructions in step 3. Note Portions of this exercise can only be completed with the use of a real device and a BNC, shown in Figure Some of these steps have alternative instructions for simulated devices. MAX searches the computer for installed National Instruments hardware and displays the information. A cable transports the signal from the terminal block to the DAQ device.
Expand the Devices and Interfaces section. Select the device that is connected to your machine. Green icons represent real devices and yellow icons represent simulated devices. You might have a different device installed, and some of the options shown might be different. MAX displays National Instruments hardware and software in the computer. The device alias appears in quotes following the device type.
MAX also displays the attributes of the device such as the system resources that the device uses. Figure shows the simulated PCI device. Make sure the device you use is named Dev 1. To rename a device, right-click the device and select Rename from the shortcut menu. Select the Device Routes tab at the bottom of MAX to see detailed information about the internal signals that can be routed to other destinations on the device, as shown in Figure Device Routes 4.
Select the Settings tab, as shown in Figure , to see information about the last time the device was calibrated both internally and externally. Not all devices contain calibration information. Calibration 5. If you are using a physical device, right-click the NI-DAQmx device in the configuration tree and select Self-Calibrate to update the built-in calibration constants and calibrate the DAQ device using a precision voltage reference source. When the device has been calibrated, ni.
Skip this step if you are using a simulated device. The device should pass the test because it is already configured. Click the Test Panels button to test the individual functions of the DAQ device, such as analog input and output. The Test Panels dialog box appears. Click the Analog Input tab. Click the Start button to acquire data from analog input channel 0 and click the Stop button when you finish. Place your finger on the sensor to see the voltage rise. Click the Analog Output tab. MAX generates a continuous sine wave on analog output channel 0.
Click the Start button to acquire data from analog input channel 1. MAX displays the sine wave from analog output channel 0. Notice that the LEDs use negative logic. The Counter Value indicator increments rapidly. Click Stop to stop the counter test. With it you can also create simulated DAQ devices to create and test your application even if you don't have hardware available.
The DAQmx VIs also let you make the measurement or generation you want to perform globally accessible from any application. A basic DAQmx application involves the following process. You must select a compatible instance from the pull-down menu. Modify the VI to use a digital trigger. The VI begins measuring when the user sends a digital trigger to the device. Implementation—External Connections 1. In this exercise, this signal triggers the VI to start acquiring data. Open Voltage - Continuous Input.
When prompted, select Copy - Substitute copy for original. Open and explore the block diagram as shown in Figure Hover over each of the DAQmx functions to learn about each function. Set the default values and settings on the front panel. The VI should begin acquiring data continuously. Modify the block diagram as shown in Figure to add trigger functionality.
After you modify this VI, the VI waits for a trigger before acquiring data. Modify the front panel and set the default settings as shown in Figure Turn the Quadrature Encoder knob on the BNC counterclockwise then clockwise to begin the acquisition.
Stop and close the VI. Automating Non-NI Instruments Objective: Recognize the components of an instrument control system and practice connecting to hardware. LabVIEW controls instruments through different buses.
LabVIEW can control stand-alone instruments, such as third-party oscilloscopes or analyzers, so you can automate instrument-based processes and consolidate multiple instrument tasks into one development environment. Hardware connectivity The physical cable connecting the instrument. Also, the communication protocol, or bus. A basic instrument control system consists of an instrument, hardware connectivity, and a computer running LabVIEW.
Different buses have different capabilities when it comes to latency and bandwidth. Instruments often have multiple ports for hardware connectivity. Configure the NI Instrument Simulator. View the settings for the GPIB interface. Communicate with the GPIB instrument. An instrument named Instrument Simulator appears. Click the Attributes tab. An interactive window appears. You can use it to query, write to, and read from that instrument. The instrument returns its make and model number in the String Received indicator as shown in Figure You can use this communicator window to debug instrument problems or to verify that specific commands work as described in the instrument documentation.
The NI Instrument Simulator returns a simulated voltage measurement. You use this alias later in the course. Click Yes if prompted to save the instrument. Instrument control in LabVIEW also lets you consolidate multiple instrument tasks into one development environment. The block diagram initializes the Agilent digital multimeter DMM , uses a configuration VI to choose the resolution and range, select the function, and enable or disable auto range, uses a data VI to read a single measurement, closes the instrument, and checks the error status.
These categories are summarized in the following table. Configure Configure VIs are software routines that configure the instrument to perform specific operations. After calling these VIs, the instrument is ready to take measurements or stimulate a system. Data The data VIs transfer data to or from the instrument. Utility Utility VIs perform a variety of auxiliary operations, such as reset and self-test.
Close The close VI terminates the software connection to the instrument. This is the last instrument driver VI called. After installation, explore the VIs that the instrument driver provides and the example programs that are added to the NI Example Finder. Select Help»Find Instrument Drivers. Click the Login button. If you have an ni. If you do not have an ni. Be sure to make a note of the user ID and password you create. After you log in, click the Scan for Instruments button.
If you have an instrument connected, clicking this button detects the instrument and finds the correct driver. In this case, it detects the Instrument Simulator. Double-click Instrument Simulator in the list and click the Search button. Select Version 2. Click the Install button. Click the Start using this driver button. Click the Open Project button. Expand the Examples folder in the Project Explorer window. Open National Instruments Instrument Simulator. Go to the Explore Instrument Driver section to continue this exercise.
Explore Instrument Driver 1. This VI reads a single measurement from the Instrument Simulator. Explore the palette and subpalettes using the Context Help window to familiarize yourself with the functionality of functions on the palette. Do not save changes. This VI reads a single waveform from the Instrument Simulator. Select the same VISA resource name you selected in step 3. Select a different function from the Waveform Function control. Run the VI again.
Explore the block diagram of the VI. Notice that it uses VISA functions to communicate with the instrument. Close the VIs and project when you are finished. A tool to configure and test DAQ devices b. A tool to test instrument communication c. A configurable Express VI d. Which of the following are benefits of instrument control? Automate processes b. Improve productivity and repeatability c. One platform for multiple tasks d. Limited to only one type of instrument 3.
You can also use the functions to create directories; move, copy, or delete files; list directory contents; change file characteristics; or manipulate paths. Provide finer control of file access. Create unnecessary resource overhead when used Save memory resources when used in in loops. Are good to use when writing to a file in a single Are good to use when streaming data to operation.
Implementation Complete the following steps to examine how the Spreadsheet Example VI performs the tasks described in the Scenario section. Open Spreadsheet Example. Save the file, when prompted, as wave. You examine this file later. Display and examine the block diagram for this VI. The constant To include more arrays, increase the number of inputs to the Build Array function.
Open the wave. The sine waveform data appear in the first column, the random noise waveform data appear in the second column, and the cosine waveform data appear in the third column. Streaming Data to Disk Disk streaming is a technique for keeping files open while you perform multiple write operations. Use the items from the String palette to convert numerics and other data types to text.
Scenario You have been given a VI that plots the current temperature and the average of the last three temperatures. Open Temperature Monitor. Modify the block diagram as shown in Figure Right-click the operation input and select Create»Constant. So, we try to use the most effective range based on what you ask without picking up a range that will make you miss data. Switch between the graph and the table as in the DAQ Assistant.
I was wondering if it is possible or if anyone has any success making a user interface, such as the DAQ Assistant, where you can switch between a graphical output or an array of the recorded signals. I would like to have this feature in my code. From now on, I'm just a waveform graph in my front panel. I'd love to be able to alternate between this waverform table and a table of output values.
I have attached a few screenshots to explain what I mean. Personally, I like the TAB ideas that have been validated, but you can also use property nodes and the visible value. Requested value is not supported for this property value. The value of the property may be invalid because it is in conflict with another property.
However, I need my DAQ assistant to be configured to generate a waveform AC continuous, not output a single alternating current rippling. What happens here? I did not have this problem before on other devices of NOR. I am using LABView I have a VI fucntioning, where signal comes 2 simulate VI signals and is being recorded. I replaced that with the DAQ assistant. I want to know if the wiring is correct and if it will give me the same result as the simulated VI. Thanks for the reply, yes I did that as well, another way to do it is the 'split signal VI' that automatically separates the signal into 2 channels, most of the high sons being Ch 0.
I need to create a filter on the name of the month. That is to say of January of the year for the 'guest' month of guest of dashboard. Ex: If I ask year and month of year in and March respectively. I should get values for Jan , Feb and March I can't try one between because that it only works on numeric values. I can't have a number of months in prompt because this isn't the condition and I am not allowed to.
Problem with difference of calculation between two dates from Monday to Saturday. I need help to change a function return number you dates, including Saturday hours - , Monday to Friday - ;. Using this function, which makes me ask properly, what hours, my problem is that I can not include Saturday hours;. Then try to add parts of your function, to get what I want, but it gives me compilation errors.
Collection of data from more than an instrument via the same labVIEW program. I have a program whereby I collect data on a scale of and save the data in the text file. Now, I need to collect data of three identical scales and save the data.
I wonder if it is possible to do so in the same program? I mean how to manage three ports and save three different text files? I enclose the current program. Communication with the scale series and I use VI:s. This is easily possible with a single program, and there are several ways to do so.
I recommend the following:. Take data from these devices in a separate loop this could be in a separate - VI, as well. These loops should be state machines if you can start and stop the acquisitions in a clean way. This assumes that the instruments are on separate ports. If they are on the same port, you probably want to use the same loop.
Write to the file in a single loop. This, too, should be a state machine. Use still another loop for your user interface. It must contain a structure of the event. This will facilitate your work in the long term. Can I block the antenna attached to the main hub of sought but allow the port to send signals at access point? Shields of aluminum foil over the main router antenna would cease its output signal? Open the router configuration page and go to the Wireless tab, change the mode of network to people with reduced mobility.
Save the settings. If your wireless network is secure only your wireless computer can connect to the wireless network and use the bandwidth. So, make sure your wireless network secure. For my first application LabVIEW, I'm looking to automate the calibration of thermocouples by measuring their response at different temperatures in a dry well Sizer. All these values are written in a. Is there a simpler way to associate with the channel calibration data? Currently, I could manually copy - paste the cells on the worksheet in the calibration sheet, but that seems just silly.
It is possible to automate the calibration screws DAQmx at a lower level, in particular the DAQmx channel property node. Using you can specify advance nationwide and the values on the scale for your channel. I recommend you take a look at this example of the community. The property node configuration will be similar to, as illustrated below:. Toshiba Web Camera software that came with my new Qosmio X - Q is very useful, and I would use it to take pictures with an external camera connected by a USB cable camera is a Kodak DC, in case this is useful.
Is it possible to use the webcam with anything other than Toshiba built in webcam? Now that I'm typing this, it seems a question more appropriate for the Toshiba site, but I guess I'll try here first. Latest version of Safari installed is version 9.
When I opened the app store, it shows an update for Safari 9. When I click on update, it downloads the update, then instal. Critical update is broken in Internet Explorer. Had some problems with my laptop from last night. I accidentally dropped it on the desktop on a height of perhaps 4 inches, which for me is a not seem like a problem in time.
WEATHER REPORT GIRL TORRENTMS is a same dark mode. This contrasts with to know your TeamViewer ID and. Double check that to delivering secure. In some cases, ads may be which can be.
Asked 6 years, 8 months ago. Modified 6 years, 7 months ago. Viewed times. Here are the scenarios in which it works: 1 I run the program and I rotate my duty cycle knob from 0,]. The resulting action is speed control clockwise on my motor - perfect 2 I run the program and i rotate my duty cycle knob from [,0].
Image of the problem. William William 31 5 5 bronze badges. Add a comment. Sorted by: Reset to default. Highest score default Date modified newest first Date created oldest first. Joe Friedrichsen Joe Friedrichsen 1, 14 14 silver badges 14 14 bronze badges. TimA TimA 46 4 4 bronze badges. Sign up or log in Sign up using Google. Sign up using Facebook.
Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Experts from Stripe and Waymo explain how to craft great documentation Ep. Featured on Meta. Announcing the arrival of Valued Associate Dalmarus. Testing new traffic management tool. Related 0. If you don't have this many voltage sources, you can connect one source to all channels or make a resistor network to vary the amplitude of the voltage at each channel.
Again, if you are using a simulated NI-DAQmx device as described in Chapter 10 , there will be a simulated 10Hz sine wave signal on your simulated device's analog input channelsthese will all be slightly out of phase. Selecting multiple physical channels for your measurement task. This will configure your task to return multiple measurement values for each channel.
This will determine how many data points are acquired and the rate they are acquired, each time we call the DAQ Assistant VI see Figure Configuring the task timing acquisition mode and clock settings. Buffered Analog In. Let's take a look at what the DAQ Assistant does "behind the scenes. The conversion to code will actually generate a new graph named " data ," so delete the " Voltage Graph " you created earlier from the front panel.
Your block diagram should look like Figure Annotations have been added, and labels shown, for illustration purposes. Ah, the digital world, where everythingfor the most partis much simpler than its analog counterpart. Actually, some knowledge of binary representation and arithmetic is required, along with knowing the following LabVIEW definitions. A digital line is the equivalent of an analog channel: a path where a single digital signal is set or retrieved.
Digital lines are usually either input lines or output lines, but sometimes can be bi-directional. On most DAQ devices, digital lines must be configured as input or output; they can't act as both at the same time. A port is a collection of digital lines that are configured in the same direction and can be used at the same time.
The number of digital lines in each port depends on the DAQ device, but most ports consist of four or eight lines. For example, a multifunction device could have eight digital lines, configurable as one eight-line port, two four-line ports, or even eight one-line ports. Ports are specified as digital channels, just like analog channels. Digital ports and lines on a typical DAQ device. A pattern is a sequence of digital states, often expressed as a binary number, which describes the states of each of the lines on a port.
The first bit, or least-significant bit LSB is the rightmost bit on the pattern. The last fourth in this example , or most-significant bit MSB is the leftmost bit in the pattern. This pattern can also be converted from its binary equivalent to the decimal number If a voltage signal ranging between 0.
Such a signal is considered uncertain, because it is uncertain how the gate circuit would interpret such a signal. Now you will get to read some digital data! Connect four digital signals 0 or 5 Volts DC to port 0, lines If you don't have this many digital signals, you can connect one source to all channels. If you are using a simulated NI-DAQmx device as described in Chapter 10 , there will be a simulated digital signal on your simulated device's digital input channelsthe digital signal will be a binary counter that starts at zero 0 and increments each time you read the data.
Configuring your task as a digital line input type from the DAQ Assistant configuration dialog. Selecting the physicals channel for your measurement task. Congratulationsyou're reading digital data! For example, you could try doing buffered digital acquisition, or continuous digital acquisition. Try configuring a DAQ Assistant VI for writing a digital output and see if you can switch relays or turn your lights on and off.
With the DAQ Assistant , it is so easy! Previous page. Table of content. Next page. DAQ Assistant express VI The first time the configuration dialog of this express VI is opened by placing it onto the block diagram, for example , you will be presented with a dialog that guides you through the process of selecting a signal measurement input or generation output type shown in Figure Configuring your task as a voltage analog input type from the DAQ Assistant configuration dialog 4.
Selecting the physical channel for your measurement task This will complete the process of selecting the measurement type, and you will be presented with the DAQ Assistant task configuration dialog. Configuring the task timing acquisition mode as 1 Sample On Demand 6. Front panel of the VI you will create during this activity Figure This Express VI converts the dynamic data type to a numeric scalar. It has been configured via its Express VI configuration dialog to return a single scalar floating point number from channel 0.
Run the VI and then press stop after a few seconds. Examine the data in the Acquired Samples array. This method of DAQ works perfectly fine under many circumstances, provided: The sampling rate is slow once per second or slower. Slight variations in the sampling times are acceptable. Two important characteristics help classify the type of analog DAQ operation you are performing: Whether you use a buffer. Whether you use an external trigger to start, stop, or synchronize an operation.
Buffers A buffer , as used in this context, is an area of memory in the PC not the on-board FIFO reserved for data to reside in temporarily before it goes somewhere else. The sampling period must be precise and uniform throughout the data samples.
You need to reduce memory overhead the buffer takes up memory. We'll talk more about buffering soon. Triggering Triggering refers to any method by which you initiate, terminate, or synchronize a DAQ event. Use software triggering when The user needs to have explicit control over all DAQ operations and The timing of the event such as when an analog input operation begins needn't be very precise.
Use hardware triggering when Timing a DAQ event needs to be very precise, You want to reduce software overhead for example, a While Loop that watches for a certain occurrence can be eliminated , or The DAQ events must be synchronized with an external device.
Selecting multiple physical channels for your measurement task This will complete the process of selecting the measurement type, and you will be presented with the DAQ Assistant task configuration dialog. Configuring the task timing acquisition mode and clock settings 6. Run the VI once and look at the graphed data. Digital ports and lines on a typical DAQ device Port width is the number of lines in a port. Activity Reading Digital Inputs Now you will get to read some digital data! Configuring your task as a digital line input type from the DAQ Assistant configuration dialog 4.
Selecting the physicals channel for your measurement task This will complete the process of selecting the measurement type and you will be presented with the DAQ Assistant task configuration dialog. Authors: Jeffrey Travis , Jim Kring.
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