Visa read doesnot see the output of the read buffer

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• difference between VISA READ buffer and chain

  Hello I'm just starting to use the VISA read and write the function in labVIEW

  everyone knows what are the degree between reading VISA and the string buffer? and the comparison of the VISA Write buffer and chain

  Thank you

  Ein salvation,

  "read buffer" is the string given by VISAReadlabel, "write buffer" is the label of the string that is expected by VISAWrite!

  There is no difference...

• Number of files PDB EM doesnot see the correctly, cannot navigate to page container

  Hallo,

  I use the Oracle Enterprise Edition Release 12.1.0.2.0 12 c database. I connected on EM Express using a common use in the State information displayed in the home page, when I click on the link below 'Type' option which indicates the number of PDB within the CDB files, I get the below error

  Fehler von Datenbankserver gemeldet

  ORA-00942: table or view does not exist

  ORA-06512: at "SYS." PRVTEMX_DBHOME', line 2356

  ORA-06512: at "SYS." "WRI$ _REPT_DBHOME ', line 124

  ORA-06512: at "SYS." DBMS_REPORT', line 898

  ORA-06512: at line 1

  can anyone help on this?

  Metalink note

  EM_EXPRESS_ALL gives a user the required privileges to perform any action in EM Express.

  is that your common username is allowed to request PDB, to test the role DBA grant common user and check again. I think the problem is with the roles of common use and not EM

  concerning

  Pravin

• VISA read lose characters beyond the end of the output string

  Hello

  I wrote a VI to take a string of output data of an ardunio Uno and analysand. I use the vi read Visa to enter the output channel of the unit. In the end I will connect a device that actually gives the value in this type of format string: (#80212164,2289,2292,2296,2300,2328,2289,2297,2290,2300,2308,2292,2295,2298,2289,22,24,0 *).

  So after a large number of loops, the program starts to drop the last characters of the string that it generates. If the string of Visa Read output reads something like (#80212164,2289,2292,2296,2300,2328,2289,2297,2290,2300,2308,2292,2295,2298,2289,22,24,). The only way to solve this problem, once it has occurred must completely close labview (completely). Once I open again and start the program running, all is well in the world.

  Has anyone had this problem? I tried to debug it in different ways and the only weird symptom I have other Visa Read function lose a few characters of the string is the fact that by looking at the bytes to the Port after I read visa, is that she starts showing five bytes instead of zero.

  my last attempt at resolving this issue is attached.

  Note: The Ardunio outputs a string of this format every 2 seconds with the values being incrimental on a specified range. (80212164,2289,2292,2296,2300,2328,2289,2297,2290,2300,2308,2292,2295,2298,2289,22,24,0 # *)

  You can configure the * your character of termination if your Arduino does not send the carriage return or line feed.  Use the configure a Serial Port to ensure that your settings are correct.  You can also use this VI to increase your timeout so that you no longer need your waiting.

• Visa read byte at the port

  My visa to read, I feed in the bytes in the property node port as input for the number of bytes to read (it's 4 bytes).  However, the output of the read visa give only 2 bytes.  It seems that a few bytes have been lost during the read operation?  Why is this?  It is an easy to see what is in the buffer of the serial port?  Thank you!

  Yik

  You likely the session VISA set to end readings when he sees a stop character and VISA reading is to see the stop character, and ending the reading, regardless of the number of bytes you told to read. If you want that it explicitly read that much then you must disable the option "Activate the stop character" in VISA set up a Serial Port.

• Visa reading reads all bytes to the port

  I have a camera that I communicate via the Serial Port. I have a standard communications protocol. For a particular command, I know that the exact number of bytes expected in return. I send my order. I see the correct number and exepcted to bytes in the port. I then read the number of bytes in the port. However, the VISA read returns only the first two bytes.

  I contacted success with this camera and this Protocol for more than 130 commands unique and different. There are only about 6 orders in which the read visa does not read all the bytes in the port. Anyone know why that would happen?  I expect to see 6 bytes. I see 6 bytes. I have visa read the command with 6 bytes. The visa read returns only the first 2 bytes. It's very very frustrating. I can do this exact process even with a different command. I expect 45 bytes of this command. I see 45 bytes with this command and I read 45 bytes with this command.

  I don't think that it is device connected as I can converse with success with the same camera on the same computer with the same cable of connector using non-LabView. It seems to be a problem strictly related to labview and VISA read the order. If someone could help that would be greatly apprecicated.

  Thank you.

  What is the exact byte stream that await you in return with this command?

  Instead of opening VISA, use the configuration Serial Port VI.  In this way, you can override the default values.  It looks that your instrument using all the defaults VISA of speed in baud rate, start and stop bits, etc.  However, in the VISA software, there is a failure to use a termination character, and this character is 10 (0x0A).  If you use the configure Serial Port, you can tell the pilot VISA do not use the stop character.

• No VISA Read reading all the bytes available and ordered

  Hi all

  I use Write.vi VISA and VISA Read.vi to send and receive packets of bytes to and from a processor.  Generally, everything works fine.  I put a loop repeats until he sees at least 20 bytes to the port, then I VISA Read to read 20 bytes.   However, when I receive some packets of bytes, my property node indicates 20 bytes to the port, I ask VISA Read to read 20 bytes, but it reads 13 bytes and leaves seven bytes to the port.  If I run the read operation again, it will read their remaining 13 bytes.

  Any ideas on what might materialize this project?

  Thank you

  Forbes

  OK, I thought about it.  I put 'Stop character activate' in 'VISA configure Serial Port' to 'False', and all my problems disappeared.

  It's fun to talk to myself.

  See you soon,.

  Forbes

• Can't see the terminal emulator port after all control with VISA

  Hello

  I created a LabVIEW VI to control cycle to PWM channels on a microcontroller FRDM KE02Z reports. The microcontroller, programmed in CodeWarrior, is set up to receive an an input of the terminal string and break it in two parts (the channel name and ratio), which are then applied to the PWM. The code works and I tested with the 2.9 Termite and a Logic Analyzer before ordering through LabVIEW. The problem I had, though, is that I have to completely close LabVIEW to see the port on the new Termite and vice versa.

  Previously, I had problems with VI after I something else in it, even a VI almost identical, more open as he was using the same port. I get errors and be unable to get my VI to work again unless I restarted LabVIEW. I was able to fix by adding a VISA flush the IO buffer according to a discussion earlier (http://forums.ni.com/t5/LabVIEW/Timing-issues-with-Serial-Read-Write-can-t-achieve-terminal/m-p/2636... once the configuration of the Port series and at least now I can jump between the screws I am still unable to see the port jumps between LabVIEW and termite, unless I close one;) Close VISA and the closure of the VI are not enough, I must close LabVIEW himself. Is it possible to achieve only within the VI? For example using a VISA or VISA clear Flush at the end (after closing VISA)? If Yes, what is the difference/preference between them?

  As I mentioned previously, the VI is functional, but I would like to know what is happening for future considerations. Would appreciate any advice.

  Hope to hear from you,
  Yusif Nurizade

  You have not wired resource VISA through the stop event name so it doesn't close anything.

• How to stop the series 'VISA read' the sends packets instead of bytes available.

  Dear Labvillians,

  Highlights:

  How can I stop series "VISA read" send me packages rather bytes?

  Background:

  I have a system which publishes series of 14 bytes on a semi-regular interval packets.

  At busy times, the producer of these these queues of data packets, effectively producing Super-paquets multiple of 14 times larger than 8 packages (112 bytes) bytes.

  My protocol handler is designed to process bytes, packets, or packets Super.

  Now, my request has multiple devices and the order of message processing is essential to the proper functioning.

  My observation is that read VISA waits until the end of a package / super package before moving the data to the application code. (See chart below)

  My expectation is that VISA read should give me bytes available, get too smart for itself and not wait for a package.

  

  .

  

  I noticed this on PXI, PC shipped, PSC and, more recently, cRIO

  I've experimented with Scan interface the cRIO rate, which helps to reduce the backlog of packages but don't decide to package under read byte.

  I understand that a solution is FPGA code write to handle and pass the bytes by R/T-FIFO, and there are some great examples on this site.

  Unfortunately, it does not help with FPGA devices not.

  I have also dabbled in the event based sequential reads, but he is evil on vxWorks devices.

  Any help is appreciated

  It is helpful to sometimes talk to yourself.

  

  

  I hope that is useful for someone sprinkle in the future

• Having trouble getting lists of reading is displayed on my iphone. I have already implemented the Division of the family and you can see the playlist on my other Mac (I have 2). Also, I have 2 iphones and cannot get the playlists will appear on the other.

  I have 2 macs. Let's call them A and B.

  Every Mac has an iPhone.

  I want to share playlists on A Mac with iPhone attached to Mac B and did not

  I have enabled the sharing of family and you can see the playlists of A Mac on Mac B

  Were unable have them appear on the iPad or the iPhone connected to the Mac B

  Have managed to see the playlists on the iphone connected to A Mac

  https://www.Apple.com/support/homesharing/getstarted/

  Read the guide carefully first.

  Then, make sure you have the same Homeshaing account (Apple ID) entered A and b.

  Enable sharing with in the preferences.

  Each library should appear and look like an icon 'home' in the top left area of iTunes (on both A & B).

  Select the library that has the playlist. Once the loading of the library, select the playlist view.

  Select the playlist that you want to import.

  Choose the area «...» "with your mouse and select"import playlist ".

  The playlist must synchronize with the goal of Mac. Under the iPhone sync settings, choose the playlist you just imported, and then press 'sync '.

• want to use visa read only when the pieces is in port

  Hi all

  I do a lot of serial data communications and visa read doesn't have an undo feature.  Heres so the question.  If I'm in the middle of the read visa, set up the picture picture and block, and I press the stop button, I have to wait for the visa reading for timeout, in this case 2 seconds, before I can move to the next step in the shutdown sequence.  Now, I know, there is a way to use the events of specefic bus, but I have yet to find a good example.  Any help or advice for a workarond for that matter?

  

  Thank you

  Matt

  
  

• 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.

• The value read by visa read that VI is not correct!

  I design a labview program to control the Agilent E5072C Network Analyzer. When I want to get the value of this instrument, I use VI "VISA read" listed in the plate. However, the value read from this VI's latest measurement of time value. For example, the last time that the read value is 1.0 db, and this time the measurement value is 1.2 db. But when I use 'VISA read' VI to extract the value is 1.0 db.

  Agilent also provide a VI for this device to read the measurement value and she was always correct value. If someone could tell me why? need to do any action before the value read from this instrument if I want to use VI "VISA reading" instead of Agilent VI?

  You are probably reading too quickly.  Reading it in NOR-MAX, you do it by hand, it takes more time.  When you do that programmatically, it is "instant".  Try using the * OPC? command to activate your order in a query.  He returned then a '1' in the buffer.  Read the '1' and then create the command fetch.

  For Dennis:

  I've had bad experiences with the drivers provided by the manufacturer to the point where I don't even try to use more.  But Agilent is also anal about their drivers, because they are on their books, they should pose no problems.

• The VISA read function is not read the bytes specified in the buffer zone

  I created a program that continuously acquire data of the inverter. But, the "Reading of VISA" function is not rreading all bytes of the buffer, which is a big problem because the way my work programme is it will extract the specific buffer bytes and convert these values in voltage and current values.

  I specified the number of bytes that I want to read the buffer as for example I want to read 21 bytes. But, even if there are 21 bytes in the buffer, the read function VISA read only 9 bytes. Im not using any character of endpoints so this is weird. I'm using LabVIEW 2011.

  Is attached a photo of my program and the results.

  You still have the active stop character.  You must connect up to a FAKE at the entrance of termination character activate on the Serial Port to set it up.

• Outlook Express - I can see the list of received emails, but can't read them in the display below pane. It is empty.

  I use Outlook Express for my e-mail.

  I can see the list of emails received, but cannot be read in the display below pane. It is empty.
  You are dragging the separator between the components of Message and preview low path by chance?
   
  See this news, but at least you're behind in the updates should not be the reason.
   
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  www.oehelp.com/OETips.aspx#10 
   
   
  Finally, try in a new identity. File | Identities | Add the new identity. Create a new one and try it. If all goes well, you can import your messages and address book from the old identity and delete it.
   
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