This is the public repository for LabVIEW code to use the LabJack UD Driver.
LabVIEW_LJUD - LabVIEW drivers/examples for LabJackUD [email protected]
October 16, 2020
Compatible with LabVIEW 7.1 or higher. Requires the LabJack UD driver.
Note that National Instruments provides a driver called NI-DAQ for their hardware. We have to provide our own driver, called LabJack UD, for our hardware. LabVIEW can talk to either driver, but realize that some NI tools like Measurement & Automation Explorer and DAQ Assistant are part of NI-DAQ and thus do not apply to LabJacks.
These VIs use the LabJackUD Driver for Windows. Before using the VIs, you should look at Section 4 of the U3/U6/UE9 Datasheet, and get an understanding of how the LabJackUD driver interacts with the hardware:
https://labjack.com/support/datasheets
This LabVIEW archive is kept as close as possible to all of our other programming examples. At its core, LabVIEW is just a graphical representation of C or similar, so although Section 4 of the user's guides is written in a text syntax, it maps very well to LabVIEW.
The downloadable zip file "LabVIEW_LJUD.zip" extracts to a single folder called "LabVIEW_LJUD" which contains this readme file, a .mnu file, and a few subdirectories. The folder can be stored anywhere, but if you want icons to show up on the LabVIEW function palette (after restarting LabVIEW), place this folder under:
...\national instruments\labview #\vi.lib\addons\
If the function palette icons are not required, a common place to store this folder is ...\LabJack\examples. We have found that most people, including us, just do this. Instead of using palette icons to select LabJack VIs, most people just:
- copy and paste from examples,
... and
- use the "Select a VI..." balloon from the function palette.
We recommend not having more than one copy of the VIs,and not changing these VIs. Make a copy in a different directory if, for instance, you wish to modify one of the example VIs. If you download new VIs from labjack.com, delete and replace the entire LabVIEW_LJUD folder.
6000 is added to the LabJack errorcodes to shift them into the LabVIEW user range of 5000-9999.
The \LabJackUD DLL Functions\ directory contains simple VIs that do little more than call functions from the LabJackUD driver DLL.
The \UE9 Raw OutIn VIs\ directory contains VIs that make calls to some of the UE9 low level functions (Section 5 of the UE9 User's Guide) through the UD driver. The UD driver has two IOTypes called RAW_OUT and RAW_IN that allow raw bytes to be sent and received. This allows the user to make calls, through the UD driver, to any low level function on any LabJack supported by the UD driver. This method should generally only be used when the desired low level functionality is not otherwise supported by the UD driver (through a different IOType).
The \Utility VIs\ directory contains VIs that encapsulate some useful functions. These will often be placed in a user's VI, and require an initial call to open a LabJack.
The \Examples\ directory has various examples. Generally these can be run stand-alone. Generally examples cannot be dropped into your program as a sub-VI. Rather, they demonstrate how to incorporate the driver sub-VIs in your VI, or serve as a starting point for your own VI.