property node

Similar Questions

• Graph plot legend colors Signal not updated when mixed with the property node

  Hello

  We try to put the colors of the trace of a graph of Mixed Signal using a property node. Although we can change the color of the data in the field correctly, the colours of the plot in the legend do not change until some apparently unrelated operator action is performed (for example, to resize the window or by double-clicking a field name).  Waveform to XY charts don't seem to have this problem.

  Anyone know a work around?  I think I saw a similar topic on the forums earlier, but I'm sorry that I am unable to find it now

  See attached vi.

  Thank you

  -john

  I should probably have joined the last post of VI, but I have has been a thread of error between the two loops.  I also deleted the text you had so I could see the I need to press the button.

• Error: The property node (arg 1) in .vi VISA set up a Serial Port (Instr)

  Hello

  I've seen people once they have gotten this error, but none of them really apply to my situation.

  Right now I use LabVIEW example code to read from a device manufacturer. This device is connected using a Tripp Lite USB adapter series (http://www.tripplite.com/en/products/model.cfm?txtSeriesID=782&txtModelID=2430) for the connection from the PC to device with RS232. The adapter works fine when using the software prepared in advance (not LabVIEW) given by the manufacturer and the COM port is seen by LabVIEW. When I run the program, I get the property node (arg 1) visa set up a Serial Port (Instr) .vi (I've also attached the VI but it's a standard VI I got of LabVIEW). I get this error despite the fact that I use the same COM port, who has worked with the manufacturer's software.

  I have attached manual of Protocol RS232/debit BUS (not sure if this applies) that requires the device. The device is a mass flow controller whose operating instructions is: (http://nemu.web.psi.ch/doc/manuals/device_manuals/Bronkhorst/917023--Operation%20instructions%20digi...

  I'm using LabVIEW 10.0.1

  Any help is appreciated

  Try to restart the PC and then try the LV version before trying other software.

  I have seen thrid party serial interfaces work on the first try but fail when you switch to another application. It was as if the pilot did not know that it was no longer the first process.

  Ben

• Issues related to the cell property node: Position Active for a table control

  Hello

  What determines the Position of the Active cell in a table control property node? I have this in my code and display the value of an indicator on front panel. The displayed value is always set to 0,0. Help for the property node says it's "read - only" so what defines the Position of the Active cell in a table control value?

  Define you the active cell with a property node.  Once you select an active cell, you can do this cell and single cell-specific things, things like the background value color.

• How to change the value of the array element by using the property node

  Hello all :)

  IM using a table in the drop-down list box. the size of the array is not fixed.

  I want property strings [] from the drop-down list box to enter text in selection, but since I placed it inside the table im unable to use this property.

  I used 'arrayelem' reference property and property node connected to it but got no strings [] in the selection.

  so is it possible that I can use property strings]

  
  

• Sample quantity sample DAQmx channel property Node substitute in LabVIEW when = 1

  [cross posted from LAVA] 

  Problem:
  LabVIEW seems to be the substitution of a value of 1 to a value of 2 for the node property DAQmx Sample Quantity.Sample per channel for a continuous acquisition mode.

  Information:
  I have a task created in MAX (version 4.4.0f1).
  When I updated To Read samples 1 the task runs successfully in MAX.
  When I read the task in LabVIEW (8.5), the property node Sample Quantity.Sample per channel (i.e. the samples to read) is converted to a value of 2.
  If the value is greater or equal to 2 to the MAX, then the Sample Quantity.Sample by channel in LabVIEW property node returns the correct value.

  I get the same problem with a real or simulated device.

  Question:
  Is this desired behavior?

  Side note:
  If N samples (acquisition of buffer finish) is selected samples To Read cannot be 1 because it causes an error 200077 - must greater than or equal to 2.
  But no error will occur when the task is saved as a continuous (continuous buffer acquisition). I don't know if this is related. The error generated is:
  Error-200077 occurred to the DAQ Assistant
  Possible reasons:
  Measurements: Requested value is not supported for this property value.
  Property: SampQuant.SampPerChan
  You asked: 1
  Valid values begin with: 2
  Valid values ending with: 8589934590

  Shouldn't
  

  Hi JG,. Remember that the number of samples (one associated with DAQmx sync settings) is not relevant for continuous acquisition.  To read a sample at the same time, you simply specify this in your DAQmx playback function.  When you configure MAX to read an excerpt, it makes this same functionality automatically. You will not be able to get the value of another property node as the value is converted as soon as the channel is created (the value non-sous the constraint is not stored anywhere by the driver).  It should not be a need to this value in your code, if you want to read a sample to a schedule the DAQmx read simple example of function.  The amount of samples by reading is not part of the task itself, but is defined when running as an input to the function read DAQmx. You get the error message indicates that your device supports should not single-point HW timed - I would have probably asking which device you were using.

• Bytes to Port property node. When to use and when not?

  Hi all

  Ive frequently used bytes to port property node performing bed series and have not experienced any problems.  I've heard mixed on this subject reviews and I would like to know when to use and when not to use it.

  Thanks for any input.

  I will start by when it should not be used.

  When there are (as readable) ASCII data to come through and it is separated by a termination character.  Select the stop character and read more bytes than you ever expect a given message.

  When there are binary data, but a protocol where you know clearly how the message package is put in place.  In this case, you want to disable the stop character because any octet can be given legitimate and be interpreted as the stop character.  With these protocols, if you know the message is always X bytes, read X bytes.  If the message is of variable length, but the Protocol is set to tell you low for a long time the message is, and then make partial readings.  So if each message starts with 2 bytes that says follow X bytes.  Then read 2 bytes, which converted to a number, then read this number of bytes.

  When to use:

  The only time will really use bytes to the port is if you use a terminal of the installation type.  Just enter and display on-screen what never happens happened at the port since the last time it was read.  When you don't care where are message breaks.

  If you use bytes to the port and care message breaks, then you're obligated to all your new message concatenated to a string, you store in a shift register and each reading analysis through data to determine if you have a complete message and valid.  If you do not, do nothing and go back and read more.  In fact, you will need to run through the chain of data several times in a row before coming back to reread in the case where the message ever resulted in a single reading packets.

  The vast majority of applications falls into one of the above situations.  The last situation is not as common, and if you use bytes to the port with a system of e-mail that has defined a defined protocol or packages, you do a job more in programming to maintain a software buffer of data as well as the hardware buffer to the serial port.

• Local property node on the VI Analyzer VS variable

  Hi I'm preparing my review of CLD. I had this problem...

  I learned that there are two methods to update the icon on front panel using the value of the variable local node and property

  It is not a good method to update an indicator using these, but if we want to update a control, then there is no choice...

  CLD NOR recommend using the property instead of the local variable node, but when I run my code on the VI Analyzer he created an event

  believing that it is better to use a local variable for good performance...

  ???????

  Yes, the text is correct. Property nodes are useful to access things like visibility and string [] in the control of the ring, but for the value, it is much slower than a local variable.

  One of the advantages is that there wired error so you can force the data stream, and given that the nodes property are executed in order, you can use a property expanded node to find out what order things occur, especially compared to a free local and free property node, in which case you would be forced to use a sequence structure where ofc is a bad solution.

  /Y

• Visible property node question

  I need to enlarge the various controls on my front and disapper with function of what is done is there an easy way to do a lot of different things appear and disappear without creating a node property for each individual. His slow me down a little during the execution and the sound also make my huge primary VI.

  Try to create a table of references to the things you want to make visible/invisible, and then pass this array in a loop with a property node inside. This should make you save a lot of space to block diagram.

  as follows:

  

• used in a Subvi LabVIEW property node

  I have a group of Boolean control front, I want to minipulate the visibility and color (4) in a Subvi.  I created a Boolean refnum cluster and spent by them in VI.  In VI, I created a group of CTLRefnum that I used as entrance pole.  In the Subvi, I am able to control the visibility through the time property node, but the Color property node (4) does not appear as a selection in the Sub - VI.  Any ideas on how I could control the colors in a Subvi.

  Hello HEJ@WR,

  Looks like you may have thrown your refnums Boolean to more generic control refnums - as the Color property is specific to Boolean values, you will need to ensure that you are now the reference type.  Visibility is a property more generic that applies to all types of controls. Refer to this article for more information on casting refnums:

  LabVIEW Help: For more specific class function

  http://zone.NI.com/reference/en-XX/help/371361H-01/Glang/to_more_specific_class/

  LabVIEWWiki also has a very good discussion of types refnum and properties specific to the class here:

  LabVIEWWiki: Control references

  http://labviewwiki.org/Control_References

  Also - if you set the example code showing what you're trying to do is much easier for other users of the forum help!

  Kind regards

• [] DisabledItems property node

  Hello

  I use a couple of controls of the ring to allow the user to my GUI to make certain choices.  I want the options available in a ring of control depend on the selection made using it.  I do this using the [] DisabledItems property node.

  See the attached example.  The selection is made by using the 'Commission' control affects items that are disabled in the "Image Type" control.  However, it is still possible for the user to select an invalid option (which would cause significant dysfunction of the overall GUI) indirectly.

  For example, in the attached VI, select 'CBS' in control of "Board", then select "Initial start-up" in control "Type of Image.  Then change the jury selected in "ACB".  The type of image remains as "Initial Boot" (although gray)-a scenario that is not allowed.

  Is it possible to prevent the disabled items in remaining selected?  Otherwise, is it possible to report when a disabled element is selected, so that the user can be prompted to change their choice?

  Any advice greatly appreciated.

  Dan

  I find that the Structure of event helps out a lot in situations like this.  See my attached VI... in the case of change of value for the control of the Board of Directors, I see if the current Type of the Image is one of the newly disabled... and if so, I change its value (in my case simple, I put it to "Operational" since this seems to be a correct value for all types of room).  I hope this helps...

• Problem with the Value property node (MacOS)

  Insofar that I tested it, the nodes of property Value (and value (signalling)) do not work under MacOS: value property is a Boolean value, the value (signaling) as a cluster (width, height).

  Even with the Boolean controls, the node does not work.

  Not such a problem in LV 8.6.

  Am I missing something? Is that some 'of use' ? Or just a bug?

  This looks like some sort of problem of indexing with the nodes property as somesort of corrupted installation.  What happens if you just delete the property node and recreate him?

  I filed a digital control and looked at the context menu of the list of the nodes property.  Below value and value (signs) are Visible (which would be a Boolean value) and Xcontrol, that when you bring through the submenus, the first choice is container bounds, a cluster of Width and Height.  If these 2 types of data which are located 2 below in the list match those you found.

  What happens if you take another node in property a few elements upwards or downwards in the context menu?  Fact is happen for other properties, and if so, are thereany properties who agree?

  Here's what look like my property for a digital nodes and I draggged the box up and down to show the natural order of the nodes property.  Notice that I have script installed, so there are a few other nodes property (and the blue box at the top) you may not have.

  

  PS. Verify you the signature.  Kudos button is now moved to the left since the update of the forum.

• How to set the property node maximum xscale for several scale XY Chart

  Hello

  I use a graph XY with three X axis and three scales of axis Y to draw the three sets of data. This works well.

  What I do now is to set the Xscale.Maximum property node for one of the x-axis (the other two autoscale). If I click right in the (Create Blockdiagram; Node property; X scale; Maximum) I can not choose what x-axis I want to put the Maximum for.

  So my question: how to select a specific axis allows you to set the XScale.Maximum property node when having several axes?

  Thank you for your help, any suggestions are appreciated!

  Hello

  After some more research and experimentation, I found that using the scale property X Active I can determine/set for which the XScale.Maximum Xscale is used.

  This solved my problem.

  I hope someone else can save themselves a few hours with this thread!

  Thank you

• Line break in the name of the Enum element? (no further questions on the property node)

  I don't know what is the meaning to allow element enum with line feeds them names (\n):

  

  It is easy to do by directly editing the control over the public Service or a constant on the comic, but it's somehow not if you use the context menu 'modify Items... "who jumps to the top of the Properties window.

  As a subsidiary question, if I try to do it programmatically:

  

  It fails with this error:

  which simply means

  That's the script as an indication only (never used script before)? If I disable the "Show script methods, etc." option, it is still available though...

  This type of property node is useful if you use LabVIEW to write LabVIEW.  The main example of this is the DAQ Assistant, but things like the right frame click JKI also do.  You usually encounter when writing automation tools development.  For example, this particular node would be useful in a tool that converts a task manager based on a string to an enum-based task manager.

  You can find the full properties of each property and method using LabVIEW.  This includes whether or not it will work in the execution or change environments.  The enum is an interesting case that confuses many.  Modification of strings of the enum of the code changes.  Most people who want to change the strings of the enum runtime should use a ring or a listbox, instead, since you can change their strings at run time.

• niDMM property node

  niDMM property node I use LabView 2011 on Win7. I'm working my way through the part of the "verification Procedure" of the "NI PXI-4071 calibration procedure. Step 5 of the procedure of verification of applications invoking an "accessible property niDMM node in writing to set the resistance of the NI 4071 entry" with the schema of Figure 5.» How is called this property node? Is there a control it is called from? Please provide the required steps. Thank you

  For me, the Instrument of e / s->-> NI-DMM instrument Drivers

• Graphic property node indicator position

  Hello! I have several graphic indicators and I want them to appear on certain positions, so I created property nodes where I define their exact position. I have a tab control in my design to separate the 2 pages front and the problem is that indicators are displayed on both pages. I want them to appear only on one page, how do I solve this problem?

  Thank you for your time.

  Hi cocopa.

  On the front panel, if you drag the graphical indicator in the appropriate page then it should stay there. If the graphical indicator has a shadow, it is on the top of the tab rather than inside a page control. In the block diagram, you must have a business controlled by the tab control structure. When you want to adjust the graphic position, have the indicator and the property node in the box to the right page. That should allow you to move the chart inside your tab control page.

  Kind regards

  Daniel H.