Can't find DAQmx Write.vi

[MS2010]

I'm trying to open a project with LV 2014. The project can't find VIs such as DAQmx write.vi, DAQmx Read.vi and other VIs like these. When I tried to download the DAQmx drivers from the CD, it said that I had a newer version (15.0) already installed and it won't give me an option to install version 14.0. According to the compatibility chart, version 15.0 should work with LV 2014 but it is not working. when I look for the vi it needs and select it, it says that it is a new version and won't take it(giving error code 9). How do I go about solving this problem?

[sebastianm127]

Hello MS2010,

Download the right version of NI DAQmx driver regarding your LabVIEW version.

Here are some links for DAQmx 14 and 15,

http://www.ni.com/download/ni-daqmx-14.0/4918/en/

http://www.ni.com/download/ni-daqmx-15.0.1/5353/en/

I hope this helps.

Regards.

Sebastian.

[Bob_Schor]

If you have multiple versions of LabVIEW installed on a single PC, you are setting yourself up for a mess unless (a) you are extremely careful how you install, and (b) you are careful to use the "correct" version for each Project.

In general, you can open an older VI (say, from LabVIEW 2014) in a newer one (say, LabVIEW 2015), but when you save the VI, you cannot (easily) go "backwards" and open it again with the older LabVIEW.  Similarly, when you install a newer version of LabVIEW, it effectively prevents you from installing earlier versions.

Several times, I've "messed up" the installation.  The easiest fix, which works most of the time, is to use Control Panel to "Remove All" in Program and Features under National Instruments.  Then reinstall, being sure to finish one version (and to reboot) before starting the next one.  In extreme cases (I've been there, too), the safest solution starts with "Reformat the C: drive ...".

Good Luck.  I think you'll do fine with "Remove All" and a reinstall of, first, 2014 (test it before going on), and then 2015.

Bob Schor

[Gregory · Accepted solution]

Hi MS2010,

Is it possible that you have DAQmx 15.0 drivers installed for run-time but not for development? If that is the case, re-install the 15.0 drivers, this time making sure to enable development as well. That would explain why it says a "newer version is installed" but does not find the VIs when opened in LabVIEW.

[MS2010]

Hi sebastianm127,

Since I already have DAQmx 15.0 installed, it won't let me install 14.0 version. The problem is when I start 2014 LV project, it won't allow me to use the DAQmx 15.0 version because it is a different version. DAQmx 15.0 should be compatible with LV 2014 according to NI but it is not working.

[MS2010]

Hi Bob Schor,

I'm starting to see how big of a mess it can be. I was hoping to get an easier fix than uninstalling everything and reinstalling as that will take a lot of time. Thank you for your input though

[MS2010]

Hi gregoryj,

LabVIEW 2015 sees the drivers but 2014 version doesn't. When I go manually and select the VIs to load, it says that the VI is for a newer version and won't load it. Thanks for your input

[Gregory]

---

@MS2010 wrote:

Hi gregoryj,

LabVIEW 2015 sees the drivers but 2014 version doesn't. When I go manually and select the VIs to load, it says that the VI is for a newer version and won't load it. Thanks for your input

---

That doesn't sound right, the LV 2014 and 2015 files should be in different folders. On my computer it would be <C:\Program Files (x86)\National Instruments\LabVIEW 201X>

So if it cannot find the VIs in the LV 2014 folder, that tells me you did not install DAQmx drivers for LV 2014. Was your order of install something like LV 2015 >> DAQmx drivers >> LV 2014?

[MS2010]

---

@Gregory wrote:

---

@MS2010 wrote:

Hi gregoryj,

LabVIEW 2015 sees the drivers but 2014 version doesn't. When I go manually and select the VIs to load, it says that the VI is for a newer version and won't load it. Thanks for your input

---

That doesn't sound right, the LV 2014 and 2015 files should be in different folders. On my computer it would be <C:\Program Files (x86)\National Instruments\LabVIEW 201X>

So if it cannot find the VIs in the LV 2014 folder, that tells me you did not install DAQmx drivers for LV 2014. Was your order of install something like LV 2015 >> DAQmx drivers >> LV 2014?

---

I do have the LV 2014 and 2015 in separate folders. And yes, I do not have the DAQmx drivers installed for LV 2014 but that is because it won't let me install them (saying that there is a newer version installed already which is DAQmx 15.0). Check the pictures. What I need is a way for LV 2014 to work with DAQmx 15.0 version.

[RavensFan · Accepted solution]

Install the DAQmx 15.0 drivers again.  Check to make sure that support for LabVIEW 2014 is checked within the installer.  It should have been automatically the first time you installed it (assuming that you already had 2014 installed.)