Analog Output (DAC) with LabView

9 posts / 0 new

Mon, 10/03/2016 - 00:21

Jimmy

Hi all,

I am new user for T7pro and LabView as well. I have downloaded LJM library and I found the example of analog input, unfortunately I could not find the example of analog output or DAC. May I please have some examples or instructions of DAC from you? Thank you!

Mon, 10/03/2016 - 11:34

LabJack Support

The reason there is not a

The reason there is not a specific example is because you can just use the generic example "LJM_eWriteName Example.vi". This example is showing you how to call the eWriteName function which is probably the easiest way to write a value to 1 register:

https://labjack.com/support/software/api/ljm/function-reference/ljmewrit...

You can use that to write to any register including DAC0 and DAC1:

https://labjack.com/support/datasheets/t7/dac

https://labjack.com/support/datasheets/t7/communication/modbus-map

Tue, 10/04/2016 - 20:53

Jimmy

Thanks for your help!

Now I am able to output a stable voltage signal and I tried to make a circuit to output a waveform. Unfortunately I failed when I used the example in library (Stream basic with stream out.vi) and my own circuit. May I please know where should I correct?

My circuit is attached with this comment and thanks for your reading!

File Attachment:

Untitled 1.vi

Wed, 10/05/2016 - 09:15

LabJack Support

We have LabVIEW 7.1, so we

We have LabVIEW 7.1, so we are unable to open VIs created by 8 or above.

The "Stream basic with stream out.vi" is limited to waveforms with a maximum of 13 points. That is a limitation of the example, not the LabJack device. The next revision of the example will allow larger data sets.

We just finished a Lua example that demonstrates Stream-Out. The example is attached and will be in the next version of Kipling. If you are unfamiliar with the T7's scripting features you can find out more here: https://labjack.com/support/datasheets/t7/scripting

File Attachment:

Waveform_Gen.lua

Fri, 01/08/2021 - 04:27

Vincent

Hello,

I've been using the a U12 in a LabView VI for a sensing applicaiton, but want to add a control using the A01 pin. I would like to access the example files referred to in this thread, but am having issues finding them. I searched my computer (search function and manual in the usual suspect locations) but cannot find them. When I try to install the package LabJack-U12-Installer-2016-09-14_0 I get an error that I need to uninstall my version to install this newer verison. But, when I click OK it cannot find the uninstaller. I have searched for the uninstaller manually as well and cannot find it. Looking at the file create date of my drivers, it looks like I have a 9/9/2015 version of the drivers

Is it possible to get the 9/9/2020 uninstaller so I can install the newest version and access the example VIs?

Thanks

Vincent

Fri, 01/08/2021 - 13:43

LabJack Support

I'm marking this for someone

I'm marking this for someone else to follow up about how to uninstall.

This thread about about the T7 which uses the LJM library, so different LabVIEW examples.

The LabVIEW examples for the U12 are not included in the U12 installer. Rather you download them from this page:

https://labjack.com/support/software/examples/u12/labview

See the Getting Started steps on that page. Since you want to set the voltage on AO1, I suggest you call the EAnalogOut function, so see the following documentation and "e function example.vi".

Fri, 01/08/2021 - 15:30

LabJack Support

You can uninstall by going to

You can uninstall by going to your system's "App & features", selecting LabJackUW, and uninstalling. Alternatively, in your installation's LabJackU12Legacy folder, run Uninstall-LabJack-U12-Software.exe . The default install location is:

C:\Program Files (x86)\LabJackU12Legacy

Close all LabJack U12 related software before running the uninstaller.

If for some reason there is no uninstaller on your system and you are getting an error when reinstalling (Probably the "You must first uninstall the current LabJack U12 Legacy version before using this installer" error), delete the following files:

C:\Windows\System32\ljackuw.dll
C:\Windows\SysWOW64\ljackuw.dll

Then run the installer again. The installer also creates the uninstaller for you installation.

The latest version of the installer is LabJack-U12-Installer-2016-09-14_0.exe. It has driver version 1.22 which has a last modified date of 9/9/2015.

Thu, 02/04/2021 - 21:53

Hal