binary read then exit by 1 channel

Similar Questions

• Binary reading

  Hello world

  I read so many lines and topics related to this BinaryRead I wonder how could I not make it work properly.

  Shrtly I have a LXI instrument I used via TCPIP interface. The LXI instrument is called hollow driver an IVI - COM who use NI-VISA COM.

  SCPI sending back answers without problem. The problem start when I need to read a block of IEEE of the VXI instrument. My driver is based on VISA-COM library and implemented a few interfaces formatted as IFormattedIO488, IMessage, but no ISerial that I don't need to use the interface series. The binary response from the instrument is: #41200ABCDABCDXXXXXXXXXX0AXXXXXXXXX which is made of 1200 bytes representing 300 float numbers.

  To avoid getting the Stop 0x0A character which is part of the binary data stream, I turn off the character of endpoint using the IMessage interface and by setting TerminationCharacterEnabled = FALSE.

  When I read the bit stream of the ReadIEEEBlock is always stop playback at character 0x0A anything.

  I read al of the places in this forum that read binary stream properly by any instrument requires two parameters not only one that I have just mentioned.

  The first, I'm able to control is on EnableTerminationCharacter to FALSE.

  The NDDN is the VI_ATTR_ASRL_END_IN attribute that could be put in a pit ISerial interface only and I couldn't access this interface of my IVI - COM driver.

  As we do not expect to use the interface series with our instruments of TCP/IP what other options I have to allow reading full of the binary stream of bytes, even when a 0x0A is inside.

  Our IVI - COM drivers are written in C++ and use NI-VISA version is 4.4.1.

  Last resort I tried to change the character of endpoints via interface IMessage for TerminationCharacter = 0 x 00 (NULL), but the ReadIEEEBlock always stops the character 0x0A?

  Binary reading is performed inside the IVI - COM driver and if successful the full range of float data points is passed a potential customer request inside a SAFEARRAY * pData object passed as parameter to a public service of the IVI - COM. The problem is that I couldn't read to pass beyond hollow character 0x0A VISACOM interface.

  Thank you

  Sorin

  Hi yytseng

  Yes, I can confirm that the bug is from VXI-11 implementation on instrument LXI himself. Until binary reading all of the previous answers have been terminated by LF (0x0A) character who has the character to end on the device_write function. The VXI-11 specifications are very bad when talking about terminator on device_write then talk to the END indicator on device_read which is not necessarily the same for device_write and device_read. I talked to the guys implementing LXI instruments VXI-11 module and the two agreed to a lack of clarity about the nature of writing and reading processed stop. Ultimately our instrument for reading binary is only the form #41200ABCDABCDXXXXXX format the only character of termination to set TermCharEnabled = TRUE and TermChar = 0x0A, who could be the interface IMessage hollow of the VISACOM interface.

  If the problem was not within the VISACOM, but inside the LXI, VXI instrument - 11 which has send the response of VISA as soon as detected a 0x0A byte value in the bit stream. Now after the BinaryRead change pass beyond 0x0A character but I find myself struggling to read in a ReadIEEEBlock appeal huge amount of float up to 100,000 points data, equivalent to 400,000 bytes for buffers used between instruments LXI and VISA are very small about 1 KB only.

  In any case the solution to my original question was the poor implementation of the VXI-11 instrument on the treatment of device_read termination characters

  Thanks for your help

  Sorin

• Difficulty using the binary read/write

  Hello

  The binary read/write function somehow not working properly in my application.

  I have one store a 2D strign binary array. When the user closes the application, the application stores the values in table in the Bin file.

  N when the application starts, it reads the file and displays its contents on the table.

  The system works well if the total size of the content is 3 bytes. But if the size of the content is greater than 3 bytes, the program simply returns a NULL value at first when I read the Bin file.

  How to save:

  Convert 2D in String table using "Flatten the string" fn and to save in a binary file.

  Procedure to read:

  read a binary file. convert the output string table 2D using 'string Unflatten ".

  I enclose my code here. PLS, have a look at it and let me know the cause of the problem.

  Ritesh

  I don't understand why you're flattening of a string, a 2D channels table. It's redundant. You seem to be also the substitution of the default big-endian to little endian byte order. You try to save it in a format suitable for other programs on other platforms?

  If this is not the case, all you have to do is:

  

• How can I exit the alpha channel in first 10 items

  How can I exit the alpha channel in first 10 elements. Should what format I use?

  Out tried in a net AVI but the file did not contain an alpha channel that would recognize After Effects 5.5.

  Unfortunately, you need transcoding video to be "millions of colors +, ' where the + is the Alpha channel. As Steve mentions, is not a capacity of the machine of transcoding in the meadow. PrPro which offers a variety of formats. Same transparency (Alpha channel) is not available for FLV, off pre - only PrPro.

  Sorry for the bad news.

  Now AE CS 5.5 has the big, new RotoBrush, which might be useful for what you need. Make you a common export/share and then use the RotoBrush AE to create transparency (chroma). Just a possibility.

  Good luck

  Hunt

• After that I have to crop a photo, apply to the harvest and then exit, the picture disappears!

  In Windows Live Photo Gallery, after I have crop a photo, apply to the harvest and then exit, the picture disappears!  I am running Windows 7.

  You have McAfee? Had the headaches.

  The Windows 7 library files are not displayed
  http://service.McAfee.com/faqdocument.aspx?ID=TS101228

• Reading and recording of several channels simultaneously

  I use a NI PCIe-6363 map to acquire data from various sensors in an experimental engine.  I need to be able to show views and record data on all channels simultaneously.  I'm relatively new to Labview, so I think I'm doing things inefficiently.  I am also having a problem with the display of multiple signals.  I have attached the vi.  I look forward to the advice.

  DAQmx is able to take multiple samples at the same time, so you need only a wire covering your While loop. See this example VI that comes with LabVIEW. You can find others with the help > menu examples and digging from there:

  C:\Program Files (x 86) \National Instruments\LabVIEW 2012\examples\DAQmx\Analog Input\Voltage - Input.vi continues

  Initialization DAQmx VI would need another kind of entry rather than "PXI1Slot2/ai0. I forgot the exact syntax, but it would be something like "PXI1Slot2/ai0-15". In addition, the read DAQMx VI is polymorphic, so that it can read all these channels in sub form of table. Then, you have to build the table of these PXI objects to initialize DAQmx VI with the function 'Building the matrix' of LabVIEW and indexing table in 16 items with function "Array Index. You only have a single function Index Array, expand right down it and it automatically will give you items between 0 and 15 (or however far you develop) without having to wire in all indexes.

• How to read the data from a channel named in windows using labview

  Hello

  I need to read the channel named in windows data. The pipe is created by python by another application. This application post permanent data on the pipe. But I don't know how to read data using labview. is it possible to read the data from different application? If possible, how to start?

  Thanks in advance

  concerning

  RJ

  Hi Rolf,.

  It's just, because of driving is not initialized completely, pipe read returns error 42, I added 2 seconds late, then its work perfect.

  Thank you very much.

  Concerning

  RJ

• What is the best way to change this program and to read 1 sample of each channel?

  The initial program was conducted with NOR-traditional DAQ. I change it to DAQmx the best I could. The program, he is already the application of voltage to generate code (Daqmx Write.vi). But I have problems with the acquisition of tensions, give me readings rare (Daqmx Read.vi) I don't know if I have to make a (Daqmx start Task.vi) for each channel in the program or if I can make it work with a single. Notice I have no significant changes a lot because this program is already running in another lab, and they send us the program so we had no problems so much but rather than get the BNC-2090, they got the BNC-2090 is who uses DAQmx instead of the traditional. If anyone can help?

  A BNC-2090 is just a connection block.  It has no effect on the question of whether you should use traditional DAQ or DAQmx.  Which is determined by the DAQ card that you are connected to the terminal block too.

  You can refer to this document, differences between the BNC-2090 and connector BNC-2090 blocks has, but it's just saying to change the label of the Terminal Board to reflect the new DAQ cards.

  What problems are you having with the new VI you just posted?  You get an erro rmessage?  I don't know what mean "rare readings.

  You really shoud look at some cases DAQmx in the finder of the example.  Some problems that you are experiencing, is that your blocks of data acquisition are all kinds of disconnected.  Generally, you should connect the purple wire from your work function of creation, through the beginning, reading or writing, then the narrow task.  Many of your data acquisition functions are sitting there on the small islands now.  You should also connect to your son for the error.

  With DAQmx, you should be combining all your analogue channels in a single task.  It should resemble Dev0/AI0... AI7.  Then use a sample of channel 1 N DAQmx read to get an array of the readings, you can then use array of index to break.

  Other things you need to do is to replace the structures sequence stacked with flat sequence structures.  Turn on automatic growth for some of your structures such as loops.  At the end of the day, you might find, you can eliminate some of the structures of the sequence.

• Binary read with one of the many possible definitions - or - how ot loop over different groups?

  Hi all

  I have a group of different data types that I save as a binary file and read it again at a later date with an another VI. I saved the definiton of cluster with a typedef, so I am sure that I use the same type of reading and writing.

  Now, I needed to change the cluster in the writing program should include another value. However, I still want to be able to use the VI of reading to read the old and new data files. I also have the opportunity to change the definition of binary file in the future (in VI writing) and be able to quickly adapt the VI to read the new definition while maintaining compatibility with the old.

  My plan was to have a typedef of the pole for each revision, say v1.ctl, v2.ctl, v3.ctl...

  Suppose I have a binary input file that has been saved using one of these typedefs but I don't know which. I now open the file and try to read its binary contents with each of my typedefs for data type and to stop once the reading of the binary VI gives no error. Then I would translate this cluster to the definition of cluster current version by wiring through existing values and assigning values of model / default for variables that are not on the binary file.

  My idea on how this could work is described here, with three versions of filetype:

  

  For each new version of filetype I would need a new business structure although the content of the business structures is almost identical.

  Because I save the file type definition version in my files, I could even simplify and use a separate case structure to update the data and fill in the dummy data:

  

  Now the error structures are completely identical, only their inputs differ by type. How can I work around this? How can I loop over the typedefs from different cluster effectively?

  I use LabView 2012 SP1.

  Since you already have a version of the cluster, just read this byte digital itself and then use a case structure date back to before the version and read the entire cluster based on whatever the version of the type definition read you.

• How to use DAQmx Read to measure several analog channels

  I have two analog inputs using USB 6221 and I want to measure the voltage of each of them.  I use vi DAQmx-read and I select input analog, 1 sample, several channels, but I do not know how to connect several channels at the entrance of the physical channel.

  Hello, Bernadette.

  For reference - I would recommend ad DAQmx questions here:

  NEITHER Forums: Multifunction Data Acquisition

  http://forums.NI.com/T5/Multifunction-DAQ/BD-p/250

  There are several ways to add multiple channels for a fast task-ni.com look for "select multiple channels DAQmx" gives me this like the hit albums:

  2X8D7F5Z knowledge base: How can I select more than one channel of NOR-DAQmx LabVIEW?

  http://digital.NI.com/public.nsf/allkb/A3A05920BF915F1486256D210069BE49

  Hope that helps!

• Binary read incorrectly

  Hello

  I did a vi to read a tiff file as binary.

  But I found that the total number of bytes read by my vi alwas missing 15 bytes.

  I checked the total number of bytes with another Binary Editor (for example, hex fiend and 0xOD).

  Anyone know why this problem occurs?

  I have attached my vi and the tiff image I tried to read it.

  Xiang00 wrote:

  Hello

  I did a vi to read a tiff file as binary.

  But I found that the total number of bytes read by my vi alwas missing 15 bytes.

  I checked the total number of bytes with another Binary Editor (for example, hex fiend and 0xOD).

  Anyone know why this problem occurs?

  I have attached my vi and the tiff image I tried to read it.

  You have a tiff file you should not interpret as a text file to count the number of bytes. You're probably losing bytes in the ASCII conversion). Use Get Size.vi file (from file IO - range of advanced functions of file) to get the total number of bytes or Binary File.vi reading (set the entrance of count-1 to read all bytes) and connect a constant U8 on the type of input data to count the number of bytes in the vi you posted (using the size of the array).

  Ben64

• Installed a Windows Update and now 5 Lightroom keeps showing an error message, and then exits.

  Windows Update and now when I try to open Lightroom it gives me a message that says "Lightroom has encountered an error when reading it is an overview of the cache and will try again during the reboot" reboot is not good at all.

  The problem you are experiencing is not related to an update of Windows. The preview cache is corrupt. You must use Windows Explorer or the Finder to open the folder that contains your catalog. Find the folder that has the extension .lrdata and delete the entire folder. Then, launch Lightroom as you normally would. Lightroom will be in the construction of a new Preview file and you should be able to continue normally.

  I don't know the reason, but a lot of people have experienced this same problem. Take a look at the more "like this" list to the right of this message. It is more common than you might expect.

• Skype says "checking account", and then exits.

  Skype was working fine until I think when I got to the window Surface Pro 3. I tried to connect & it worked for a second then says "checking account". It closed after. I have uninstalled & deleted the data. Tried to connect, plugged into my Microsoft account & it worked. Then he did the same thing again.
  Help?
  I'm on my android with a LG Optimus F5.

  Here is a workaround solution that I found. Turn off the internet. WiFi and data. Open Skype. The press page oops pass in the upper right. This goes to Skype. Now re - turn on the internet. Skype works now.
  Long way round, but it works for me until we hope support Skype can fix it properly

• Not able to read 4000 samples the analog channels of cDAQ module (module NI 9205)

  Please check the chart bloack (FALSE Structure box state a wait with 20ms function) and attached the code (saved in LabVIEW 2015).

  

  On executing the code and using the button 'Trig', I can see only 1000 samples (for each channel) and not 4000 examples.

  Please help me to understand what I am doing wrong?

  Entry of son "4000" to "samples per channel" Schedule VI DAQmx. The default value when unwired is "1000".

• Calendar in a loop DAQ with write, read, then a bit of transformation

  (I use a PXI-6052e, DAQmx and Labview 8.6. I have time real module installed if it would help to solve the problem that I have.)

  I am writing a control program that requires a certain sequence in a loop, which is:

  1 four of the digital i/o pins on the Board (to set the status of a switch), then update

  2. to provide a boost to a brooch (to launch the failover), then

  3. take a sample on each of the three analog inputs,

  4. processing on these three samples and use the output to update maps.

  Now, I know that, separately, my methods of control for the switch and the subsections of sampling/dsp doesn't work. However, when I try to combine them into the same loop there is a problem with the sync the sequence above. Clearly I'm not going to things the correct way.

  I have attached the main VI containing the 'main measure loop' so that you can see how I'm trying to do things. The loop is in the last picture of the stacked sequence (the first two are just stuff of calibration - ignore them).

  Ideally what I want is to have this loop running at 1 kHz (for example), and each iteration has the above followed by sequence [i] in that order [/ i]. To monitor the output pins and switch output but it is clear that this is not the case.

  Thank you very much for any advice. I know that I'm doing it wrong, but I can't work on how it is supposed to be. I tried using a loop timed but in vain.

  I've implemented the attached file. If you could have a look to make sure that's not crazy, it would be great.

  I use two counters. The first is at 1 kHz and begins immediately. The 500 Hz counter is triggered to start on the front of the meter to 1 kHz.

  Also, AI samples are acquired on each rising edge of the counter from 1 kHz.

  In the future, I should be able to increase this to have a few more counters, I suppose?