Re: How do I prioritize DMA transfers in Labview?
Hello, In researching your question and talking with other engineers, I=92ve discovered that another engineer, Jeremy L, has been working on this issue. In order to address your question more effectively I=92d like to link back to the other posting. In this way, Jeremy and I can more efficiently combine our effort to help you. The link to the other post: http://exchange.ni.com/servlet/ProcessRequest?RHIVEID=3D101&RPAGEID=3D135&H= OID=3D5065000800AAC5&UCATEGORY_0=3D_32_%24_12_&UCATEGORY_S=3D0 Thanks, Ken S. National Instruments
Re: printing error
Hello, This problem seems like something described in the following Knowledge Base: http://digital.ni.com/public.nsf/websearch/2FCAAF080951FCAB86256982007AA16C= ?OpenDocument This Knowledge Base basically states that something may not have been installed correctly. It walks through how to completely uninstall the Report Toolkit. Let me know if this doesn=92t help out. Have a great day! Ken S. National Instruments
Re: Where is 'goop.zip' download for LabVIEW 7?
Hello, Thanks for posting a location for the GOOP zip file, PJM_Labview. I also found an additional discussion forum post that discusses compatibility with Labview 7.0: http://exchange.ni.com/servlet/ProcessRequest?RHIVEID=101&RNAME=ViewQuestion&HOID=506500080073A8&ECategory=LabVIEW.LabVIEW+General Hope this helps. Let me know if there is anything else I can help with or clarify. Ken S. National Instruments
Re: can I use my usb port by itself as an DO/DI?
Hello, There=92s good advice here from all who have posted on this thread. I=92d like to second their comments on the parallel port. The parallel port is probably the easiest way to do what you=92d like, but be very careful as the parallel port I/O can=92t source/sink very much current, and you can burn it out quite easily. Here are some links to example programs involving controlling the parallel port from Labview: http://sine.ni.com/apps/we/niepd_web_display.display_epd4?p_guid=3DB123AE0C= BAFEE034080020E74861&p_node=3DDZ53015 http://sine.ni.com/apps/we/niepd_web_display.display_epd4?p_guid=3DB45EACE3= DDDF56A4E034080020E74861&p_node=3DDZ52058 http://sine.ni.com/apps/we/niepd_web_display.display_epd4?p_guid=3DB123AE0C= BA4C111EE034080020E74861&p_node=3DDZ52058&p_source=3DExternal I hope these help out. Ken S. National Instruments
Re: Why does the Skale option in a Subpanel object doesn't work Propperly?
Hello, Unfortunately the line decorations are known not scale properly with the other front panel objects. One possible workaround is to use a =93Flat Box=94 decoration and make it into a very thin box. This box can then be filled with a black color using the set color tool from the tool palette. This technique can be use to create horizontal and vertical lines. Hope this helps! Let me know if I can help with or clarify anything. Ken S. National Instruments
Re: Intensity VS. Time
Hello, I=92m not sure I understand your application. From you block diagram, it looks like you are turning on a laser with a digital line 3. Then it appears that you are writing some analog input data to a file until the user presses the stop button. When the stop button is pressed it looks like you=92re turning off the laser control line. Does this accurately summarize your application? There were several possible issues I noticed with your VI: 1. The =93Laser On/Off=94 button was connected to the Port Width input of the Digital Line Write VI. I believe this should be connected to the Line State input of this VI. Having this Boolean value connected to the wrong input was not allowing your VI to run. Also, the iteration input of this VI should be connected to the iteration counter of the While Loop. 2. I=92m not certain of what is being done in the Case Structure attached to the Stop button. Are you trying to read from the digital line 0, and then write this value to digital line 3? If so, a Digital Line Read VI should be used to get the value of digital line 0. This VI can be found in the same function palette as the Digital Line Write VI. Please let me know if there is anything I can help with or clarify. Have a great day! Ken S. National Instruments
Re: This message "internal fault graphobjs.cpp in line 56 pops...
Hello, Thanks for reporting this. I=92d like to try and replicate this crash. Could you please post the smallest VI which causes this crash? Also could you please tell me what operating system you are running, and exactly what values you put in for the =93Find=94 command (including search string, options, etc.)? Thanks, Ken S. National Instruments
Re: LV crashes while loading my llb, but the built app. functions correctly???
Hello, As I understand it you=92ve basically got several subVIs which cause Labview to crash (on two different PCs) when they load, regardless of whether these subVIs are in an llb, etc. The only exception to this is when you build an application using these VIs or you use your splash screen program to load them into memory. One thing to try to fix this would be to do a Mass Compile on the llb which contains these VIs. To do this, open a blank VI in Labview (you don=92t have to open the llb to do this), and from the menu choose =93Tools->Advanced->Mass Compile=85=94. It will then prompt you for the location of the llb file. After choosing the llb file hit the =93Mass Compile=94 button. If this doesn=92t fix the subVIs, could you post one of the offending subVIs so that I could see if I can repeat the issue you=92re seeing? Thanks, Ken S. National Instruments
Re: Analog Output buffer delay
Hello, I=92m certain of what you mean when you say that =93the waveforms in output have a delay equal to output buffer length=94. Do you mean that the output waveform values should be changed and the buffer size should stay the same size? Or do you want to add new waveform data to the end of the waveform you created with the Initialize Array VI? Thanks, Ken S. National Instruments
Re: Unknown Excel Error code -2146959355
Hello, This error can sometimes occur when different versions of Excel are used on the different computers (2000 vs. XP, for instance). I would check the Excel Active Object that your Automation Refnum is attached to and make sure these objects are the same version on the two different machines. Also do you know which Invoke Node or VI is throwing this error? Hope this helps! Let me know if there is anything else I can help with or clarify. Ken S. National Instruments
Re: Has anybody built a BERTS generator and detector over a network?
Hello, I=92m not exactly sure what your application is but here are the two paths I can see: 1) You=92d like to do BERT testing on a data set. This data set is transferred to the PC via TCP/IP. In this case I would suggest using the standard TCP/IP VIs that are included with Labview 7.0 to transfer the data. These VIs are located in the following location on the Function Palette: =93All Functions -> Communications -> TCP.=94 There are also examples for using the TCP/IP VIs at the following location in the NI Example Finder: =93Networking -> TCP & UDP=94 Once this data is collected you could perform BERT on the data set using the Modulation Toolkit: http://sine.ni.com/apps/we/nioc.vp?lang=3DUS&cid=3D12855 2) You=92d like to do BERT testing on the actual TCP/IP traffic that=92s going by on the Ethernet segment your PC is attached to. The TCP/IP data that is received by Labview and most other TCP/IP applications has already had data packets with errors in them removed and retransmitted by the networking card and/or the operating system, so the data you would see from Labview shouldn=92t have any errors in it. To get the raw data from the Ethernet segment would require low-level Windows API calls and/or access to the networking card driver itself. Hope this helps! Let me know if there is anything I can help with or clarify. Ken S. National Instruments
Re: Why does a strictly Typed Control cause error 1082
Hello, I think a similar issue has already been reported to our Research and Development department, and they are currently working on it. Could you post your code so that I can make sure this is the same issue that has been reported? I can also take a look at your code and see if I can find a workaround for you. The important thing here is to have the Main VI, the sub VI and the strictly typedef=92ed control. Thanks, Ken S. National Instruments
Re: interrupt timer driven
Hello Kai, Unfortunately we aren=92t able to support other manufacturer=92s data acquisition cards. Interfacing to an interrupt on your Wasco card really depends on the driver and programming interface that was created by the card=92s manufacturer. National Instrument's data acquisition cards include a driver called NI-DAQ which installs the card drivers, VIs to interface to the card from LabVIEW, and example programs to do many common measurement tasks. I can give you a general idea of how to access your DIO card. First you would need to install drivers and any development tools that are included with the card. Next you would need to determine from the manufacturer=92s documentation how to access the interrupt. After that you can either call VIs directly (if the VIs were provided by a manufacturer), or you can make calls to a DLL (which would also need to be supplied by the manufacturer). The DLL functions can be called by using a =93Call Library Function Node=94. This VI is located on your Function Palette at the following location: =93All Functions > Advanced=94. If you need any other help or clarification, please let me know. Have a great day! Ken S. National Instruments
Re: Problem with mail browser
Hello, Typically email attachments are added to the text of a mail message just as you are seeing in the mail browser. To extract files from this data you must parse it from the message text. The protocol for how this info is encoded is called MIME. Documents called RFCs define this protocol. These RFCs can be retrieved from http://www.ietf.org/rfc.html. The RFCs corresponding to MIME are 1521, 1522, 1524, 1563, 1437, 1652, 1651, 1556, 1740, and 1741. Another option is to look at the =93SMTP Email Send File=94 VI included with LabVIEW 7.0. This VI encodes a file into MIME to transmit via SMTP. You could look at this code to try and reverse engineer it to decode MIME. Hope this helps! Let me know if I can help with or clarify anything. Ken S. National Instruments
Re: Why does a strictly Typed Control cause error 1082
Hello, I=92m glad to hear you found a workaround for this issue. There is nothing you have done wrong in your program to cause this. There doesn=92t have to be any relationship between the strictly typed VI and the VI which is throwing the error. The error can actually be replicated by two independently running VIs. Our R&D engineers are currently working on this issue. Ken S. National Instruments
Re: ValueChanged event programmatically ?
Hello Oliver, What Greg stated above is entirely true. The design of the Value Change property in the Event case was intentional. However, there is a way to programmatically =93fake=94 the Event case into thinking that a Value Change event was initiated by a front panel user. This is a feature that was added in LabVIEW 7.0, so it is unavailable in previous versions of LabVIEW. To programmatically trigger this event, create a property node from the front panel control you wish to change. Setting the =93Value (Signaling)=94 property of this control changes the value AND generates a Value Changed event. This property was specifically designed to allow programmatic generation of the Value Changed Event. Hope this helps! Let me know if there is anything I can help with or clarify. Ken S. National Instruments
