Add event to VISA N read/write

Similar Questions

• How to add more variables to a read/write control?

  

  See how the read/write control is connected to global variables? I want to add more variables, I created the globals (some are listed in the table above), but as you can see that they are not available in the read/write control. How can I add them? I also tried to create a new read/write control, but as you can see that didn't help.

  Any help would be appreciated.

  Hi count3r5tr1ke,

  It seems that you are referencing a particular bitfile in open FPGA reference. I think that even when you save your FPGA VI, VI real time still referencing an older bitfile. Have you tried re - compile and referring to the new bitfile once finished compiling? A sure way to make sure that you have the most up-to-date bitfile is to check the VI option when you right-click on the FPGA Open reference and select Configure the reference open FPGA. When this option is checked, if you make changes to the FPGA code, it will force you to re - compile the FPGA VI before you reference it on the real-time side.

  Best regards,

• Visa series read write

  Hello..

  I have no problem with reading series. I want to playback multiple visa series... Fist read I want to read the data of 5x8bit uC then if visa data read isnot "NOT" I'm going to send data to the CPU as the character ' end then read data from uC to new but is leght data 2x8bit data...

  Please, help me...

  This is the number of bytes you want to read. You already said you first want to read 5 bytes. If you use VISA set up the Serial Port and the stop character allow to true, you can set a number of high bytes and playback will end when the stop character is detected. The character of default endpoint is a line break. If you set it to false, you can use the bytes VISA to the Serial Port to determine the number of bytes in the buffer is and read this number. This makes the basic example.

  Did you do any debugging serial communication base? I suggest that you use a program like Hyperterminal/Procomm/Putty/.etc before trying to write your own program. It is also difficult to give detailed advice without knowing how you have set the serial communication of the microphone.

• VISA from read/write to serial port - unable to implements several orders of writing!

  Hello

  I'm new to Labview and I'm reading from a pressure through a virtual serial port USB sensor. I am able to read the port when you use HyperTerminal

  The code sequence that I should write to the port in order to obtain measurements using hyperterminal is the following:

  ' *' (2A hex)-online start and the responses of the port by asking 'Command', I should then enter

  FF-online measurement select the port must ask the 'mode', so I should enter

  0 has-online measurement of high resolution mode and it was then that I should start receiving action.

  The port is always answer by errors when I write the start command or the FF one. I tried to establish a sequence stacked to write the three commands then read the port, I added some delay between the three of them, but it does not work.

  Now I made really simple and removed the stacked sequence and just put the three commands one after the other and try to remedy not to not on the code.

  I'm really stuck at this point, could someone help me please? I read a lot fo articles on the forum, but I can't solve this problem

  Thank you

  I have attached my VI and the SCP1000 documentation (I can provide other versions of my demo if necessary)

  The reason for your problem is a frequent misunderstanding even among experienced programmers. Take a look at this thread

  http://forums.NI.com/NI/board/message?board.ID=170&thread.ID=417750

  In your data sheet, then they return codes like 0xFF or 0x0A so has a single byte of average value. Then you in your-active code constant writing FF\n is so this equal to values in format hexadecimal 46460A and your instrument do not understand. But it will include FF0A. In order to solve your problem, you would type in \FF\n in your '-' chain helped codes. Remember too, if you type in \32 it will be converted to character 2 this being 0 x 32 50 decimals and code ASCII 50 is equal 2

  Take the time and change the display format of string between '-' display and Hex display and you will see the difference

  Hope this helps

• Several problems of reads/writes of Visa

  Hi all.

  I've been using labview VISA to communicate with an I/O device called a µChameleon.

  I need to monitor the status of mutiple pins by sending an entry VISA to query the PIN then use a read VISA to identify the State of the PIN.

  The problem I have is when I use several reads/writes VISA. When I run the present, only one VISA reading returns the corresponding pin State, but everything else show nothing. The funniest is when I use run highlight, they will return all the State of the PIN.

  The photo below shows the basic principle of what im doing by simply copying the base serial number read and write code. For example, I send the string 'State of pin 1' followed by a carriage return and if it works correctly it should return a string Read VISA saying ' pin 1 1 "(top) or" pin 1 0 "(low)." ""

  Can someone help me witht that. Is this a timing problem with the VISA of the readings?

  
  

• Possible timeout in VISA read/write in While loop

  As the title says, I have a while loop that is constantly written followed by reading using VISA read/write.  I'm waiting for buffer correspond to a certain one, which the true value would end the loop.  In this loop, I have an indicator showing how many times he runs. All of this is repeated in another while loop.

  My problem comes the counter arrives at 10, then stops at the "write" command.  Do not know why.  I tried to increase the time-out of the instruments, but nothing has changed.  I added a delay of 10ms in loop, which also has not changed anything.

  For reference, I use a tektronix scope series 3000 of the MDGS and checking its state of relaxation.

  You said chill to read earlier!

  But it is not supposed to have to write it either.  Experimentally, access all VISA nodes, right-click and choose the Mode of synchronous i/o.  Make it synchronous instead of asynchronous.  The watch symbol will disappear from the top right corner.  See if that changes anything.

  What kind of serial port are you using?  What is an integrated in the PC?  A USB to serial port adapter?  Makes the chips on that, Prolific and FTDI?  You can try with a different serial port or a brand of adapter?  A lot of people have had problems with prolific chips.  And I have also heard of people having problems using adapters who had fake chips in them.

• Synchronization with Serial read/write problems. can not get the functionality of the terminal emulator

  Hello

  I am writing a VI to control PWM with a microcontroller via a serial port. I wrote a simple code for the microcontroller that allows me to set the ratio of duty cycle on a scale of 0-65535. It works very well with Termite of Compuphase (RS-232 plug); The microcontroller invited me to an entry, expected that I would one, updates and expected another entry when I decided to send him. Now, I'm trying to get the same functionality on a LabVIEW vi but hit a snag.

  When I tried to send my orders with a series read base and an example of writing, everything worked fine. I could see the prompt entry, write an entry and if I was quick enough, check out the update message. Even when I was not fast enough, I was able to check the update by monitoring the PWM pin with a Logic Analyzer. The problem with the basic example, however, is that I need to update the report to aura cyclical ratio, so I went for an example of reading continues writing. The problem I've met; is that I have to switch between reading and writing to make it work. When I do that, either I don't hold write it down long enough and nothing happens, or I get several updates when I switch to reading. Some of these updates don't even match and produce updates to defective upgrades for example; 16000 16000, 16000, 16000, 6000, 600, 60, 16000, 1600, 60, 0, 0, 0, 16000, 60, 0, 0 etc.

  I tried which allows characters of endpoint in the hope that the writing would end at the end and go to reading where he would receive a termination character and wait for me allow writing once again, but nothing helped. I still have to alternate between the two and either get no response on reading several updates of variable accuracy. I tried to remove her allows read/write and their structures of matter in the hope that the loop flow, associated with the characters of endpoint would the case, but then the updates don't register at all. The funny thing is I did a VI like this before with an Arduino and that there not even no need to switch between writing and reading (I'm now using a Board of Freescale FRDM).

  I was also the frequency of timeout errors; Error-1073807339 at VISA Read, reason Possible: VISA Hex 0xBFFF0015. I removed the option to stop the while loop if there is an error so I can run but always pops up an error on the judgment occasionally. Could the problem of synchronization always cause me problems?

  Would appreciate all advice really, I am providing my slightly modified example screws and can provide the code for microcontroller on request, even if it's very simple.

  Thanks in advance, it is
  Yusif Nurizade

  In other words, frankly, a good bad example you according to your code. Also, you have the order of writing and read upside down in your amendment if the instrument requires a command to return something. It should really be using a structure of the event. The structure of the event around a write and read and use a value change event. I have attached a quick change. This mod is still a reading after writing. If necessary, you may have two separate events to write and read.

• Cannot access the card reader/writer internal Flash

  After a few updates, I can access is no longer any SD card inserted into the card reader/writer Flash. I tried to use the convenience store but just that said there is no problem found. When I insert the SD card, it appears in the 'control Panel\Hardware and Sound\Devices and printers' as ' Flash Card Reader/Writer "but I am not able to access the card.

  Hi Tim,.

  Was there a card player offered to you via Windows update driver update?

  -You see no drive letter assigned to the flash card while you see for readers in the window 'computer '?

  -What is the error you get when you go to the map?

  I suggest you try to change the drive letter assigned to the card and see if that helps.

  1 type diskmgmt.msc in the RUN prompt or in start search to open the computer management window.

  2. right click on the indicated card device and select "paths of access and change drive letter.

  3. click on change if there is an assigned drive letter, and then change to another letter. If this is not the case, click on add and select a drive letter.

  4 restart the computer so that the changes are applied and see if you are able to access the content in the map.

  For more information: http://windows.microsoft.com/en-in/windows7/change-add-or-remove-a-drive-letter

  Alternatively, you can try to uninstall and reinstall the drivers for the card and see if that makes a difference.

  Visit the website of your computer manufacturer to download and install the latest drivers.

  Let us know the results.

• Enter a share with read rights and have read/write rights

  I have a folder with my photos on my Mac. In this folder, I have all my photos in subfolders and will add new pictures once I created the share. I want to make them accessible to my family there own PC/Mac. But only with READ ONLY. My problem is that a user (account to share on my Mac) with reading rights can access my shared with read/write rights.

  I have my Mac with 10.11.2 the following users/groups:

  • (Jens) My Admin account
  • (Erika) Account sharing
  • (Family) A group

  Group of members of the family are:

  • Jens
  • Erika

  My folder permissions to "/ Volumes/ExtHD/Bilder" are:

  • Family: read
  • Jens: Read/write
  • everyone: read

  I enabled file sharing in the system settings and the 'Pictures' folder added to the share list.

  Now I go to another Mac with Yosemite, go to network in the Finder, select the computer with the share, connect to the "Erika" and open the folder "pictures". I can generate records or files, delete files, so I have read/write rights. Why?

  Finder don't show me no option 'Erika' should have rights to write to this folder. Why is she able to delete files?

  If get you information on the drive, it is the checkbox ignore verified property?

  What is the format of the disc?

• Big against little endian - how will this affect my Performance of read/write PDM

  Hello

  I read that LABVIEW intrinsically stores data in big endian format, but the read/write of the VIs DDHN have the little-endian as a default. Simply, you wonder what is recommended for these screws TDMS and if these options affect writing / reading performance somehow?

  Hello

  The endian of data does not affect the performance of the read/write of the DDHN screw the primacy of the format is just down to personal preference when working low level with data.

  If you do not read or write the bits in a personalized way, then I would recommend leaving the endian as it is by default when reading or writing. Otherwise, use any kind you like or prefer to go through.

• I use VISA 5.3 for reading my serial device... my standard equipment is WELL this device will send four messages for only one comand I need all four messages to display at the same time in VISA SERIES READ BUFFER

  I use VISA 5.3 for reading my serial device... my standard equipment is WELL this device will send four messages of single command given to this instrument... and I read messages through VISA series READ... during the race, the VI buffer displays the messages individually...  I need all four messages to display at the same time in VISA SERIES READ BUFFER, in order to find more than this block, I should add from the palette of function.

  Disable character of endpoint detection or make four readings where you concantanate simply the strings together.

• Make the NTFS read/write permissions without possibility to create/delete folders

  Out to one of our sites, we have a server running Windows Server R2 of 2012 which took a file share accessible to our people on the spot. Our project managers have developed a very strict folder for this file share structure, and for the purposes of verification, they want to stick to the closer this structure as possible.

  Therefore, although the local people must have read/write access to create, edit, and delete files, they won't they are able to create or delete folders. They want to use the existing folders and not to store stuff in folders that nobody knows there is except for the person who created them.

  The closest way to you, I got to do is to uncheck the advanced permissions "create folders / adding data" and "Delete subfolders and files." This has some side effects, however, the most notable being the inability to add data to the files, some files (such as CAD drawings) can be changed by anyone except the person who created them.

  Is there a way using only the NTFS permissions to accomplish what the project leaders? And if not, are there any third-party utilities that will help us do this?

  Thanks in advance for any help.

  Try asking in the Windows Server forum:
  http://social.technet.Microsoft.com/forums/en-us/category/WindowsServer

• Read/write function reads a bad value?

  HY,

  I'm using on my FPGA OR Quadrature encoder.

  (http://www.ni.com/white-paper/6608/en/)

  I add a few entries, so that its possible to set an offset value.

  

  In all the VI on the FPGA, works very well with my encoder.

  If I start the VI on my FPGA, the position value is 0, because of the "first round"? Element.

  Now, I used the command of read/write in a while loop on my host VI to get the current value of the encoder.

  After I start my host vi the defiler position always shows the value "2".

  If I use the highlight function, the value remains at '0 '.

  This is a really strange behavior, I don't know what can be the cause of this problem.

  All positionsoffset values are 0 and encoders on my 9401 module entries are tied to the land.

  The position value is only written on the fpga, nowhere else.

  Anyone have any idea why?

  Thank you very much.

  

  
  

• events of visa do not work properly!

  Hello labview programmers!

  After that I realized that this visa read function is the poll the port so blocking of my code, I looked at how to use the visa events.

  I have exactly as delivered examples showed, but events visa acts as office of vote - it hangs the front panel and the blocking of other

  loops in my program runs correctly. I looked at his stats to cpu consumption and it was ok - 3%.

  What could be the problem?

  I thought about it!

  In the properties of the vi - enforcement - execution system - the value has been set by me in error to the user interface.

  events of visa and visa features evil works in this mode!

  I went it same as appellant and she finally solved my problem!

• Read/write file binary change greater than 128 bytes.

  Hi all, maybe a strange question, but I'm scratching my head on this one. There is undocumented behavior in the function of read/write binary file, where U8 a value greater than 128/0 x 80 get automatically converted to 0x3F value?

  I try to use LabVIEW to generate a binary file custom that we'll load in an EEPROM, so all data in the binary file is stored as values of U8. I have a "template" file, and eventually I'll take the logic implemented to replace the fields with the data from the true value. However, I am struck by the anomaly that when I just read the file in LabVIEW and then réécrirait, all the values 0x80 and more are truncated to 0x3F value. Has anyone seen this before, and is there a solution?

  I noticed writing the value 0 x 80 directly to one generates a binary file (such as a U8) 0 x 90, 0 x 70 being written in the binary file. It is also rather undesirable, as it adds additional bytes in the bytestream, and the bytes of EEPROM must be in exact locations.

  

  

  Join your data file.

  This program is to give the images below?  Are you sure that LabVIEW is to write the bytes differently?  I really doubt that.