The NI-DAQ driver for use with National Instruments data acquisition products comes with an easy-to-use API of LabVIEW VIs. These LabVIEW VIs are made by the NI-DAQ team at NI. Similarly, if you wanted to use a 3rd party DAQ device in LabVIEW, you would need to check with the manufacturer of the DAQ board to see if there already exists a library of VIs to do so. If not, you still may be able to interact with the board through direct DLL calls (Call Library Function node)to the driver for the device. This is sometimes not easy to do, and you will need to know the functions supported by the 3rd party driver and in what order to call them to perform the desired operation. See the below links for more information on interfacing with 3rd party DLLs and DAQ devices.
How Can I Use 3rd-Party Hardware with LabVIEW?External Code for LabVIEW - CIN / DLL - Starting Point
