Programming NI-DAQmx Using Microsoft Visual Basic .NET

Overview

This article explains how to program an NI DAQ hardware device or module using Visual Basic .NET with NI-DAQmx or Traditional NI-DAQ (Legacy).

Contents

Introduction

Using either the NI-DAQmx or Traditional NI-DAQ (Legacy) driver you can program in Visual Basic .NET. With NI-DAQmx you can use Measurement Studio for Visual Studio which provides additional tools for use with NI-DAQmx, though Measurement Studio is not required to use NI-DAQmx in a text-based environment.

 

NI-DAQmx

  • National Instruments provides a native .NET API for NI-DAQmx. This is available as a part of the NI-DAQmx driver and does not require Measurement Studio.
  • If Measurement Studio is installed it will provide support for Visual Studio provides native .NET class libraries and integration and code generation tools for NI-DAQmx and Visual Studio. For example, Measurement Studio 7.0 and later adds the DAQ Assistant for code generation, integrated Visual Studio help, user interface .NET controls, and project wizards.
  • Examples are included with NI-DAQmx and can be found at:

C:\Documents and Settings\All Users\Documents\National Instruments\NI-DAQ\Examples\DotNET<.NET Framework Version>
 or
C:\Users\<User Name>\Documents\National Instruments\NI-DAQ\Examples\DotNET<.NET Framework Version>

or
C:\Users\Public\Documents\National Instruments\NI-DAQ\Examples

Note: If the paths above do not exist, be sure you have .NET support installed for NI-DAQmx.

  • Additional examples using Measurement Studio and NI-DAQmx are available. These examples are available in the Measurement Studio help and can also be found at:

C:\Documents and Settings\All Users\Documents\National Instruments\MStudioVS<Visual Studio Version>\DotNet\Examples
 or
C:\Users\<User Name>\Documents\National Instruments\MStudioVS<Visual Studio Version>\DotNet\Examples

or
C:\Users\Public\Documents\National Instruments\MStudioVS<Visual Studio Version>\DotNET\Examples>

  • For both NI-DAQmx and Measurement Studio examples, sub-folders named vb contain Visual Basic examples.

 

Traditional NI-DAQ (Legacy)

  • NI-DAQmx replaced Traditional NI-DAQ (Legacy) in 2003.  NI strongly recommends using NI-DAQmx for new applications. 
  • National Instruments does not provide native .NET components for Traditional NI-DAQ (Legacy).
  • You can use the Traditional NI-DAQ ActiveX controls to perform data acquisition. The CWDAQ ActiveX control is provided with the Traditional NI-DAQ Driver and does not require Measurement Studio.
  • You can create a new VB  project and use the ActiveX controls that are installed with Traditional NI-DAQ. To add the CWDAQ ActiveX Controls to a .NET project, complete the following steps: 
    1. Inside a .NET project, select View » Toolbox from the pull-down menu.
    2. The Toolbox will appear. Right-click in the toolbox and select Add/Remove Items.
    3. The Customize Toolbox will appear. Select the COM Components tab.
    4. On this tab, you can select the specific CWDAQ control you want to use and click OK.
    5. The control you selected will now show up in the toolbox, where you can drag and drop it onto the form.