read into the buffer variable published network shared

Similar Questions

• The data read into the buffer HAVE lack samples at the beginning

  I use a box USB-6251. The program implements two channels of AI (read I and Q) on a single task and one channel on another task. The channel uses the ai\SampleClock as its clock, so that both are synchronized. C creates a digital pulse periodic rising edge (a clock basically) which is used as a trigger on an external function generator. The signal from the unit after going through some material, external signal processing is ultimately what is read by the channel of GOT it.

  We know from the relevant signals, they seem to be correctly synchronized scope. IE, the analog signal to read arrived on the channel of the AI of the acquisition of data more or less instananeously when the trigger is activated. If there is a delay, it is of the order of microseconds.

  However, when I read in the buffer of HAVE (repeated FiniteSamples), waveform, I always come back has a section of samples at the beginning that seem to be returned of the first actually read data-point (see attached image). This delay is of the order of milliseconds (it varies with each series).

  I want to totally eliminate this delay. The signal should be a sinusoid which begins to sample 0 and is continuous through until the last sample read.

  I put the code below.

  Installation program:

  Create analog read the task
  
  analogReadTask = new Task ("analogReadTask");
  
  Create the virtual channel for the component I
  
  analogReadTask.AIChannels.CreateVoltageChannel (initParams.AddrI.ChannelAddress, 'I', AITerminalConfiguration.Differential,-4, 4, AIVoltageUnits.Volts);
  Create the virtual channel for the Q component
  
  analogReadTask.AIChannels.CreateVoltageChannel (initParams.AddrQ.ChannelAddress, 'Q', AITerminalConfiguration.Differential,-4, 4, AIVoltageUnits.Volts);
  To set the clock for the analog readings
  
  analogReadTask.Timing.ConfigureSampleClock (string. Empty, initParams.SamplingRateHz, SampleClockActiveEdge.Rising, SampleQuantityMode.FiniteSamples, Totalechantillons);
  Create the mult-channel drive
  
  analogReader = new AnalogMultiChannelReader (analogReadTask.Stream);
  
                  analogReader.SynchronizeCallbacks = false;
  pulseWriterTask = new Task ("pulseWriterTask");
  Creating a digital output channel that provides the trigger to the U/S system
  
  pulseWriterTask.DOChannels.CreateChannel (initParams.AddrUsTrigger.PortLineAddress, "US trigger", ChannelLineGrouping.OneChannelForEachLine ");
  
  pulseWriterTask.Timing.ConfigureSampleClock ("/ SampleClock/AI/Dev1", initParams.SamplingRateHz, SampleClockActiveEdge.Rising, SampleQuantityMode.ContinuousSamples, samplesPerPulse);
  
  pulseWriterTask.Stream.Buffer.OutputBufferSize = samplesPerPulse;
  
  pulseWriterTask.Stream.WriteRegenerationMode = WriteRegenerationMode.AllowRegeneration;
  pulseWriter = new DigitalSingleChannelWriter (pulseWriterTask.Stream);
  pulseWaveform = new DigitalWaveform (samplesPerPulse, 1, DigitalState.ForceDown);
  
  pulseWaveform.Signals [0]. The States [0] = DigitalState.ForceUp;
  analogReadTask.Control (TaskAction.Verify);
  
  pulseWriterTask.Control (TaskAction.Verify);
  
  

  From reading:

  analogReadTask.Start ();
  
  Start writing the digital pulse, however it will not start
  
  until the AI/SampleClock begins, so implicitly synchronizing the two tasks
  
  pulseWriter.WriteWaveform (pulseWaveform, true);
  analogReader.BeginReadWaveform (Totalechantillons, readerCallback, analogReadTask);

  Result (should be a sinusoid from end to end)

  

  Always seems to solve these problems, shortly after their validation.

  The problem has start the digital task AFTER the analog task. In the small delay between the two lines of code running, read analog had already begun, and so some of the impulses of the AI/SampleClock were missed by the task. The order of departure between the two tasks of switching solves the problem.

• Are published network shared variable write & read Atomic actions

  Hello

  I have a very basic question about shered (published network) variable.

  I think I know the answer already, but since I couldn't find in my documentation, I thought that it is more prudent to request...

  Are reading and writing on a shared variable of stocks Atomic?

  To be more precise: on my target real time I create an array with data (each element being the configuration item or a cluster containing name, value, and type) and when the table is finished I am this store in a published network shared variable.

  On my host (Windows), I'm voting (in a loop) until the table contains at least 1 item, when this is true I'm parsing all the elements in the table.

  Is there a chance that, reading of the shared variable, the table contains a subset of the original painting on RT target (i.e. the action of reading takes place while writing is still ongoing).

  Or is the action of reading delayed until the write is completed? (i.e. both write and read actions are atomic even over the network)

  I think the latter is true but not could find no evidence in the documentation.

  Kind regards

  SoC

  Hello Rob,

  Yes, you can access the entire value, data type - you use both. For the table data type, the integer value is actually the full picture. So, Yes, you can see reading and writing as Atomic actions.

  But, on the other hand, you can lose data if the RT system rewrites the variable before the host had the time to read. To avoid this, you can enable buffering for the variable. See the following links for more information:

  http://www.NI.com/white-paper/4679/en

  http://zone.NI.com/reference/en-XX/help/371361H-01/lvconcepts/buffering_data/

  Finally, you can also activate a FIFO RT on your target RT if you need to send data through the variable in a deterministic section of the RT. See also, more information:

  http://zone.NI.com/reference/en-XX/help/370622H-01/lvrtconcepts/rt_projectvariable/

• VI refuses to run when the published network shared variable is not available

  I have a VI of logging data on my PC that gathers data from several sources, including several shared variable published network hosted on an RT target.

  The problem I have is that the data logger VI refuses to start if the target RT is disabled and the VI is abandoned if the network connection is interrupted.

  Is there an easy way to detect when running, be published these variable network are available and use a placeholder value, if they are not rather than the current behavior of refusing to work?

  I saw many people using data sockets, but I try to avoid the overhead of setting up and testing a loop of treatment relatively complex network on both ends when the network has published shared variables are so simple to use and works perfectly as this abnormal behavior.

  You can replace them with programmatic access (shared variable aperture and friends) and the dummy data placeholders if the variable is not accessible.

• Shared Variable (published network) communication

  Hi all

  All day I was hitting my head with variable communication shared between RT host and the host computer:

  I basically tried to pass an array of the host of the CR to the host computer. For this I used a published shared variable of network type Array U64. I used this link to help me understand usign shared variable communication

  http://www.ni.com/white-paper/4679/en ...

  I also activated RT FIFO. Now in the city that link the information given on the use of FIFO of the single element or Multi element FIFO

  "By enabling real-time FIFO, you can choose between two types of compatible FIFO slightly different variables: the only element and the buffer insurance program. A distinction between these two types of buffers, it's that the only element FIFO reports no warnings on positive or negative overflow conditions. A second distinction is the value returned by LabVIEW when several readers read an empty buffer. Several readers the only element FIFO receive the same value, and the only element FIFO returns the same value until a writer writes back to this variable. Several readers of a FIFO empty array each get the last value that they read from the buffer or the default value for the data type of the variable, if they have not read before variable. "

  I had read the content above a 100 times, but still I'm not able to get a clear picture of the difference and when to use which option. So I decided to take the text and tried to try something for me.

  I had a loop in the reception of RT who writes arrays of 3 different elements in the 'network published variable shared'. Now when I use the option of multi element with "number of berries as - 2" I am able to read tables separates one by one in the host computer (as you can read a queue in general).

  Now when I used the option of single element for the RT FIFO with 1 UN editable table option, only the last table written in the 'shared variable published network' is read in the host computer.

  This seems absolutely ridiculous as if this is the case, then what is the purpose of creating the "buffer". For testing purposes, I had put the buffer in 5 tables.

  In fact, I have only a single author (written in loop in the reception of RT) and a reader (new looping in the host computer). So I don't know even if I need option of the RT FIFO for the published network shared variable.

  I'm sorry for the long message but I've reached the limits of going around in circles waiting to type somewhere

  I know I made a mistake stupid somewher or it miss me probably a clear simple trick but don't know what it is...

  I request some clarification... In fact I posted a little while earlier today so ... bind - http://forums.ni.com/t5/LabVIEW/RT-Host-to-Host-computer-communication/td-p/2348130 )

  any help would be appreciated

  See you soon

  me

  Hello

  I think that the difference between these two types is clearer by using LabVIEW:

  "

  Activation of the FIFO in real-time

  You can activate the FIFO in real-time to a shared variable since the page FIFO in real-time of the properties of the shared Variable dialog box. Check the box Enable the FIFO in real-time in a deterministic way share data using the one element or several elements FIFO.

  Single element FIFO

  One FIFO shares the most recent value of the data. The shared variable overrides the value of data when it receives a new data value. Use this option when you need only the most recent value. Configure the size of the elements of the array or the size of the waveform for the FIFO buffer, if you select a table or a waveform data type.

  Several elements FIFO

  A FIFO multi-elements implements buffer the values shared by the shared variable. You can configure the size and elements of the buffer FIFO to match the parameters of buffering to use of the Variable page, or you can configure a custom size for the FIFO and FIFO elements.

  Note  For single item both multi-elements FIFOs, if the variable contains data table or a waveform, you must configure the size of the elements FIFO equals the size of the data to share. If the network buffer both the RT FIFO are enabled, the network buffer should be at least as big as one of the elements of FIFO. Sharing data smaller or larger that the specified length results in a memory allocation which affects determinism.

  Note  Waveforms contain variant of varying size that are not compatible with real-time FIFO. Therefore, if you enable the FIFO in real-time on a shared variable that contains the waveform data, the item variant waveform data does not transfer.

  "

  http://zone.NI.com/reference/en-XX/help/370622K-01/lvrtconcepts/rt_projectvariable/#Single_Element_F...

  ' Hope this helps

  Aurélie

• Shared data varying variable published network write error

  In my project in real time, on the VI host running on my Windows PC, I try to write in a number of published network shared variables.  All these write operations are successful (which means that I can read them on the RT target, then a cRIO-9012), except for these shared variables network-published with data type defined as Variant.  I'm not sure what is causing the problem.

  I take the table of clusters shown here...

  

  .. .and going through one "in Variant' VI and then subsequently in writing to the shared variable (data type: Variant).  Diagnosis of the failure of the VI in real-time to read the data, I found that variable writing shared on the host VI produced the following error:

  Error - 2147467259 appeared to Variable shared in the PC host TTS CTRL.vi

  Possible reasons:

  LabVIEW: Unspecified error (Hex 0x80004005).
  =========================
  System OR Configuration: Various operating default (Hex 0x80004005).

  This error or warning occurred when writing the following shared Variable:
  Shared \\My Computer\Network Variables\TC trust Array Group - network
  Shared \\128.144.90.143\Network Variables\TC trust Array Group - network

  .. where 128.144.90.143 is the IP address of the PC.

  Any thoughts?

  Sean

  I saw this post, and when I found myself with no other option, I have redefined the variables in question to the string data type and replaced all the "to variant" and "given Variant of ' functions with functions 'Flatten channel' and"The string Unflatten"respectively.  Initially, it did not work - functions "Chain Unflatten" would produce error 74, until I realized that the "data includes array or string of size? (T)"input on each 'string Unflatten" function must be set to FALSE. Wiring a constant false for each instance of "Unflatten to the string" seems to have corrected the problem.

  I have still no idea why wouldn t Variant.  Shared variables Editor allows to define a variant data type, so I guess it's supposed to?

  Sean

• I am connected to the internet, but my network sharing Center proclaims that I'm not.

  The paradox connected but not connected

  I am connected to the internet, but my network sharing Center proclaims that I'm not. Because some of my programs believe later, they refuse to patch. Also, I used the antivirals ware, scans, System Configuration and deleted and later restored the wireless network.

  Any help would be greatly appreciated. Thanks in advance.

  Hello

  1 reboot as often, this allows the refresh icon and also stops a few things of
  interfere with the slot troubleshooting process.

  Do a 1 Restore Point then you can go back to where you were if necessary.

  How to create a Vista System Restore Point
  http://www.Vistax64.com/tutorials/76332-system-restore-point-create.html

  ------------------------------------------------------

  Control Panel - network - write down of the brand and the model of the Wifi - double click top - tab of the driver - write
  version - click the driver update (cannot do something that MS is far behind the pilots of certification). Do
  It will be the same for network (NIC) card - then right click on the devices and UNINSTALL - Reboot -
  update the driver stacks.

  Now go look at the site of the manufacturer of the system for the updated drivers.

  After watching the system manufacturer, you can check the manufacturer of the device an even newer version. (The
  manufacturer of system become your backup policies).

  Look at the sites of the manufacturer for drivers - and the manufacturer of the device manually.
  http://pcsupport.about.com/od/driverssupport/HT/driverdlmfgr.htm

  How to install a device driver in Vista Device Manager
  http://www.Vistax64.com/tutorials/193584-Device-Manager-install-driver.html

  Download - SAVE - go where you put it - right click – RUN AS ADMIN.

  You can download several at once however restart after the installation of each of them.

  Repeat for network (NIC) card and is a good time to get the other updated drivers as Vista like
  updated drivers.

  If you update the drivers manually, then it's a good idea to disable the facilities of driver in the Windows updates,
  This leaves ONE of Windows updates, but it will not install the drivers who are generally older and cause
  questions. If updates offers a new driver and then hide it (right click on it) and then go look for new ones
  manually if you wish.

  How to disable automatic driver Installation in Windows Vista - drivers
  http://www.AddictiveTips.com/Windows-Tips/how-to-disable-automatic-driver-installation-in-Windows-Vista/
  http://TechNet.Microsoft.com/en-us/library/cc730606 (WS.10) .aspx

  -----------------------------

  Allow you to reset your TCP/IP stack just to make sure:

  Start - type in search - ORDER - search box at the top of list and RIGHT CLICK – RUN AS ADMIN

  Enter these one at a time (or copy and paste) and press ENTER after each

  ipconfig/flushdns

  nbtstat-r

  nbtstat - RR

  netsh int Reinitialis

  netsh int ip reset

  netsh winsock reset

  Reset

  ----------------------------------

  Make sure you know the details of connection to your wireless router - SSID and password.

  You lose connection when you do and have to redo your logon.

  Control Panel - Network & Sharing Center - right, click Customize - page set of network locations.
  lower left click on merge or delete network locations - REMOVE all instances of your network (and the
  others you don't use anymore) - REBOOT.

  ---------------------------------
  Other tips:

  If the use of a wired cable - Control Panel - device - network adapter - (NIC) Manager - double
  Click Advanced settings and set the "speed & Duplex" 10 Mbps full duplex and then try 1/2
  double-sided. Be sure to APPLY / OK. Maybe some help here: (don't forget the answer is)
  complicated because there's probably more than one single thing, the origin of the problem)

  Others.

  http://www.pctipstricks.com/tips-for-troubleshooting-network-cable-unplugged-error-for-wired-Microsoft-platform-PCs/

  http://www.how-to-hide-IP.info/2009/05/16/CYBERGHOST-VPN-fixing-network-cable-unplugged-error/

  http://www.annoyances.org/exec/Forum/WinXP/1109372091

  There are many causes, one of which is the small monitor pays attention to the evil network device.
  You can try to disable any other network such as WiFi device and reboot to see if that has an effect.

  Still a problem of equipment such as a loose network card that is not properly attached to the computer can
  cause this.

  http://compnetworking.about.com/od/WindowsNetworking/f/cableunplugged.htm

  I hope this helps and happy holidays!

  Rob Brown - Microsoft MVP<- profile="" -="" windows="" expert="" -="" consumer="" :="" bicycle=""><- mark="" twain="" said="" it="">

• the buffer copied into the buffer entry with Rs232

  Hello

  I have a problem with serial port and do not know what to think

  I send commands to a device (hmp231) and when I read the message on the entry stamp I retrieve the command

  only one thing that I've ever met, it would be a coding error? everybody respected this disorder?

  I thought that it could be specific to the device, but when you use hyperterminal just retrieve the response with the command...

  Concerning

  Tinnitus

  Your instrument has an echo, but then it should also be the case in hyperterminal or you have set the hyperterminal do echo off the coast.

  Or fill you the buffer via a shiftregister yourself. Please send the vi that you use to check this.

• writing in shared variable published network hosted on rt (defined as slave modbus for crio) problems

  Hello Forums or

  This is my first post on this forum and I've been using labview for about 8 months now

  I have a problem about writing data in the modbus registers through a server of e/s defined as a slave modbus for my hardware 9074. Once I finished the project of construction and deployment of the variables and by following the instructions here , he reports no results but a row of zeros. I have the DSM nor opened and configuration modbus master to see whether the data is actually read or written on the respective sides that give the same line of zeros so.  What I am actually trying to write is a single-precision floating data table. The registers are structured F40000-F46534 runs from 10 items or have them for range AF40001L1-AF46534L1 of the AF40001L10 point where it's an array of length 10. (Referenced beaches here)

  I know 1 thing for you, the modbus connection works and is ready for data requests, I tested cela NI DSM and set manually the data for and received my master.

  System and project specifications

  Windows 7 operating system

  LabVIEW edition development system complete 2011

  No module Labview DSC, but I use the real time such referenced by one of the documents

  This project is an application in real time with fpga mode (and not scan interface)

  The master and the slave are the same network and subnet

  Connection Modbus type: TCP

  9074 compact slots rio 8

  9234 module x 3

  module 9221 x 1

  9472 module x 1

  Engine service Variable shared running on windows os and rtos system

  Used this guide to learn more about the Protocol modbus, as I have searched all over the internet to learn more about modbus

  I already have software Modbus IO Server installed on the crio thanks to max or 1.8 for NI RIO 4.0 version

  file attachment (s)

  Image of software specifications Crio

  Image of data written in scheme-block rt variable

  Short version of the problem: why is the e/s no variable writes in with the converted correctly data?

  Okay, Yes, it's that I was the one proposed. Regarding the news of the error, if you look at the bottom of your image to DSM, you see a little commfail and an error code, but it seems that those are OK.

  The only thing I can think is that DSM (or another function) is written for a range of values that includes 400004. I suggest you to put into service 4-going to a range of 3. 3 s are entered only (perspective control), then you can be sure that the master is not trampling on the data. Once you have checked that, look at DSM and any other code running to make sure q EU not accidentally write 0s to the same reg.

• My PC detects that my Kingston card reader into the USB port but wont read SD card - why?

  Several ports USB in my PC w/Windows XP see all my USB key and can read the data, but while "type" my Kingston card reader 4ports are recognized, it will not read the SD card. Why?

  You should have installed service pack 3, a long time ago, but this probably isn't the cause of your immediate problem.  Until the last part of your response, I would say that you need to get a new card reader.  However, if the card reader works on another computer, something seems to be the issue.

  What is the model of your Kingston card reader? It should appear on the label.

  With the drive connected to a USB port, open the Device Manager (start > run > devmgmt.msc > OK).

  Normally, you should see a number of entries in the category 'Disks' for the number of different locations in the card reader.  They probably will be named something like, "Kingston USB 2 HS-CF USB Device" and similar.  It should also have an entry in the "De Bus USB controllers" category that says "USB Mass Storage Device".

  Check all the entries above.  If none of them display a warning icon (exclamation), double-click the entry and to report to what appears in "Device status" and "use of the device.

  Right click on each of the entries corresponding to the card reader (i.e. one for each location in the hard drives category card reader and an in the category USB controllers USB mass storage device) and select uninstall.  After all, entries have been uninstalled, disconnect the player from the computer card and restart.  Now reconnect the card reader.  Windows should recognize and install it automatically.

  NOTE: If you have a hard drive connected by USB, you must be careful that you uninstall the correct USB mass storage device.  The safest way to do this is to use the "Remove hardware safely" to stop your external drive and then disconnect it from the computer.  At this point, its entry will be removed from the Device Manager.

  If the procedure above does not read your card before the card reader, I am ideas.

• I try to print the laptop wireless to network shared printer

  Can I connect a wireless laptop that runs Windows XP on a home network with the ISP running on Windows Vista computer?

  Hello

  You can check the links that has steps on how to connect to the computer on the network below.

  Establishment of a network domestic: http://windows.microsoft.com/en-US/windows-vista/Setting-up-a-home-network

  Networking computers running different versions of Windows: http://windows.microsoft.com/en-US/windows-vista/Networking-home-computers-running-different-versions-of-Windows#section_5

  Add a device or computer to a network: http://windows.microsoft.com/en-US/windows-vista/Add-a-device-or-computer-to-a-network

• Could not start the service on the Local media player network sharing computer.

  Error 3: could not find the path specified th.

  Hello

  · Do you remember all the recent changes on the computer before the show?

  · What is the service pack installed?

  Run the checker system files on the computer. Link, we can see: Description of Windows XP and Windows Server 2003 System File Checker (Sfc.exe): http://support.microsoft.com/kb/310747

  Note that: if he asks you the service pack CD, follow these steps from the link: you are prompted to insert a Windows XP SP2 CD when you try to run the tool on a Windows XP SP2 computer system File Checker: http://support.microsoft.com/kb/900910 (valid for Service pack 3)

  How to troubleshoot possible causes of Internet connection problems in Windows XP: http://support.microsoft.com/kb/314095

• Difference between waiting occupied buffer and read by the wait of the other session in 10g

  Hello
  
  Can someone let me know the difference between waiting occupied buffer and read by other session wait in 10g
  
  Thank you

  http://download.Oracle.com/docs/CD/B19306_01/server.102/b14237/waitevents003.htm#sthref2988

  
  buffer busy waits

  Wait that a buffer becomes available. This event occurs because a buffer is either be read in the buffer cache by another session (and waiting for this reading end the session) or the buffer is the buffer cache, but in an incompatible mode (in other words, some other session changes the buffer).
  

  http://download.Oracle.com/docs/CD/B19306_01/server.102/b14237/waitevents003.htm#sthref3159
  
  read by another session

  This event occurs when a session requested a buffer that is currently being read into the buffer cache by another session. Prior to version 10.1, expected for this event have been grouped with the other reasons for waiting for the buffers under the event "wait occupied buffer.
  

• LV/CVI how can I access variables 'unique process' shared by his name?

  LabviewCVI 9.0, how can I access a variable shared 'unique process' by his name?

  Hi jenstl,

  If you are referring to a LabVIEW shared variable project unique process, then I don't think that you can access it (directly) from the CVI. As its name suggests, the variable is related to a single process, i.e., LabVIEW.

  If you want to share a variable between LabVIEW and CVI, you could try a shared Variable of published network. Not only is it really easy to convert a process unique to a network shared Variable shared Variable, but there is also an example on their share between LabVIEW and CVI.

  Community: CVI and LabVIEW shared Variables published network

  For more information on Variables shared:

  Developer Zone tutorial: use the LabVIEW shared Variable

  Also, I originally said that you cannot use a single shared Variable directly from the ICB process. I added the 'directly' in there because in all likelihood, you might happen to a (potentially convoluted) workaround involving the use of ActiveX to call the LabVIEW ActiveX Server and communicate to the Variable shared in this way.

  Hope that helps!

• Media Player network sharing service uses 40% of my processor

  Hello

  I bought the HP P6270IN with win 7. everything is perfect, but... I have a problem... media player network sharing service uses 40% of my processor . I do not want to use WMP library. Please advice how to solve this problem.

  Parth

  Hi Parth,

  Welcome to the Microsoft Answers site!

  You use the Windows Media Player network sharing feature?

  If you use this service while the service is required to operate to check computers or network devices with which you share your music. This service also index/updates of the library that is shared.

  If you do not use this service and still is using the CPU you can change the type of start up manual (which is to be launched by the user).

  To disable the service temporarily

  1. opening the Services Control Panel, or type services.msc into the start menu search/run box.

  2. double-click on Windows Media Player Network Sharing Service, and then change the service to Manualstartup.

  This has now disabled temporarily the service unless you manually start the service. You can restart the computer and check if the service has been stopped and the CPU usage was down.

  Hope this information is useful.

  Amrita M

  Microsoft Answers Support Engineer
  Visit our Microsoft answers feedback Forum and let us know what you think.