ayumisano

Dear Michael, I put both Port Config and DIO Clear in the while loop and luckily the triggering still works. Thank you for the help and suggestions from all of you! Ayumi

Hi Michael, I have attached the image of part of the DAQ program. I am not sure whether this helps but since the program is too large to use 'screen capture'. I am thinking whether it is the DIG line in the while loop that makes the problem. So now I am trying to use Port Conifg and Port read and DIO clear instead, and I put Port config outside the while loop and Port read and DIO clear inside the while loop. It seems that the memeory leak problem is solved (I ran the program for 12 hours but it didn't show me the message of insufficient ram as it did in the past), but I have not yet tested whether the triggering still works properly (that is, whether it can still receive a signal from the PCI-6534) if I put it this way. Thank you for your help! Ayumi

Hi Louis: I don't understand what you mean by "create reference". Do you mean using port config inside a while loop? Thanks for your help! Ayumi

Dear all, Thank you for your reply. I know that it is memory leakage because I open the task manager and I can see that the the ram "comsumed" by LabVIEW is increasing while there is no triggering. I will try to find a simpler version to post here. I would like to know whether PCI-6602, PCI-6601 and PCI-6534 can be used for hardware triggering. Thank you very much for your help. Ayumi

Dear all, I am writing a data acquisition program with LabVIEW. The program has a while loop which waits for triggering from outside. The program works properly when there is triggering but there is memory leakage when there is no triggering. I would like to know whether there is any method to solve this problem. Moreover, does hardware triggering require specific I/O cards such as PCI-6534? Thank you for your help in advance! Ayumi

Dear Pete Liiva, Thank you for your reply! I am using the digital input of PCI-6602 and NI 6509 only, there are at least 20 inputs for each card. (five PCI-6602 and one NI 6509) Actually the average event rate is not that high, it's only 1 event per second, but of course the faster the better. If the event rate is one event per second, how long would the delay be acceptable? Thank you in advance~ Ayumi

Dear all, I would like to know whether it is possible to synchronize five PCI-6602 and how. (I was told that it's impossible to synchroize more than 4 cards, by an NI staff) My aim is to synchronize a NI 6509 and five PCI-6602. Moreover, I would like to know the delay time of taking data and finishing taking data of a software type digital I/O card. Thank you very much for your attention! Ayumi

Dear all, I would like to buy an I/O card for data acquisition. The event rate is 1 per second on average. What I need is digital input and 96 bits. Which card do you recommend? Thank you very much for your attention! Ayumi

Dear all, I am writing a library for the LabVIEW Call library function. I have to include sstream and use istringstream and ostringstream from sstream. I am building the .dll using MS Visual C++. However, there is always error telling me that istringstream and ostringstream are undeclared identifier when I build the .dll file. I have tried building a simple .exe file which also include sstream and I use istringstream and ostringstream in it and I use MS Visual C++ to compile it. There was no error. I would like to know why the error only occurs when I build a .dll file and what I can do to solve this problem. Thank you very much for your attention! ^^ Ayumi

Dear Pete Liiva, Thank you so much for your help! Finally I did the job! Ayumi

Dear Pete Liiva, Thank you very much for the user manual of PCI-6602!! Should I set port 0 and line (for example) 12 if I am trying a read an input signal from line 12 of the I/O card? I am using LabVIEW 6.1 only and it cannot be used with NI-DAQmx devices, I wonder if it can read from all 32 lines of PCI-6602. Anyway, thanks a lot for your help! Ayumi

Dear Pete Liiva, Thank you for your reply! The signal I am reading is just 9V from a battery (simple circuit with a light bulb, made intentionally for testing these I/O cards). There is no way to add lines (other than 0 - 7) to 6602 and 6601 for NI-DAQ, I can only see port 1, lines 0 to 7 in the test panel in NI-DAQ traditional devices. Can all PFI be changed into DIO? Ayumi

Dear all, I am connecting 5 I/O cards (1 PCI-6534, 3 PCI-6602 and 1 PCI-6601) and trying to read digital signals from them. I was told by an NI staff member that 5 NI I/O cards cannont be connected together to take signals, however, it works properly for the combination mentioned above. I would like to know whether it works properly is because the 5 cards are of the same generation, or the claim of that NI staff was wrong? Another question: I would like to know whether it is possible to make PCI-660x family take 32 bits digital signals (I am using LabVIEW 6.1 and NI-DAQ [not DAQmx]). Thank you very much for your attention! Ayumi

I have tried both burst mode and executable file. The executable file of Cont Pattern Output did not give an incrase of frequency of 1 order. It was still around 1.5MHz. And for the burst mode, I don't know why there was no signal seen when I connected one of the line with a CRO. (I used PCI-6534) :headbang:

Thank you for your reply!! I will try burst mode to see if it can give a 20MHz pulse. At the same time, I am thinking about creating an executable file instead of running a vi. I would like to know whether running an executable file will be faster than running a vi. (I mean increasing MHz now to the order of 10MHz. It is said that because the exe file does not need compilation anymore but the vi does, is it true?) Ayumi

Thank you for your reply! ^^ Linux doesn't use .dll, right?? So what should I do to make a library in Linux? I am reading the articles from LabVIEW bookshelf about calling external code. It seems that only C source code can be used in Linux. Can C++ source code also be used in Linux?? (It would be a disaster for me to write the code again in C since I am not familiar with C) Ayumi

Neville, Thank you for your reply! 1. I am trying to send out pulses at highest frequency possible. (5V TTL) 2. I am using LabVIEW 6.1 3. PCI-6534 and I use electric cable to connect the I/O board and the CRO to read the signal 4. As seen in the attached vi, you can change the frequency of the signal output, the highest frequency which can be acheived is 1.25MHz with this vi. I would like to know whether it is because of the speed of my computer or it is because of other factors. Thank you very much for your attention! Ayumi Download File:post-2711-1125844859.vi

It's ok that I can build the vi again in Linux, but I just want to make sure that the functions which are available in Windows LabVIEW are also available in Linux LabVIEW.

Oh!! That means I cannnot use .DLLs that were written in Windows?? What can I do?? I used C++ to write and made a .dll (I spent a lot of time on it ) Is there any way that I can use these codes in Linux (so that I will not waste my effort)? I am sorry for being not familiar with Linux.

Thank you for your reply! The most difficult thing is...I have the cintool dir in the LabVIEW folder. ^^""" I was using Dev C++ for writing the .dll file. Now I change to MS Visual C++ and everything seems to be OK so far~ Ayumi

Thank you for your reply! I would also like to know whether the funtions available in LabVIEW for Windows will also be available in that for Linux. (Since I have finished writing some vi with LabVIEW in Windows, I understand that the vi written in Windows cannot be used in Linux, but at least I hope that I can use those vi written in Windows as the blueprint and modify not too much if I want to have the same function in Linux) Thank you for your attention~ Ayumi

Dear all, I have got a disc of LabVIEW which could be installed in Windows, I wonder if I can also install LabVIEW with the same disc in Linux. If yes, can I just install it in Linux by just putting the disc into the CD-rom? Sorry for my ignorance, I am not that familiar with Linux. Thank you for your attention~ Ayumi

Thank you for your reply! Now I am trying to make an output signal at highest possible frequency and the result was 125000Hz by the example named Const Pattern Output.vi (available with LabVIEW). Over 125000H it would show the following error message: "Because of system and/or bus-bandwidth limitations, the driver could not write data fast enough to keep; up with the device throughout; the onboard device reported on underflow error. This error may be returned erroneously wen an overrun has occured" But the PCI-6534 should have a maximum of 20MHz. Is it limited by Windows?? Will it be better if I use Linux instead? Thank you for your attention! Ayumi

Dear all, I would like to know what factors affect the speed of how fast a vi respond. I am trying to find out the time between sending a digital 5V TTL signal and then writing down the time in a file and after that asking the vi to send out a TTL signal back. (Since my final goal is to make it finish doing everything in the order of nano second) Is the speed of the whole process affected by the I/O card, the computer's speed and any other thing else? I am using PCI-6534. I saw the data sheet on the web that it works at 20MHz. How can I maximize its speed? Thank you very much for your attention!! Ayumi

Dear all, Thank you very much for your help Ayumi