Create DataAcquisition Interface

This example shows how to create a DataAcquisition interface object and add channels to acquire and generate data. You can also configure the DataAcquisition object with the channel properties needed for your operations.

Find Devices Based on Vendor

View all the available NI devices on your system using the daqlist function.

daqlist("ni")
  2×4 table

    DeviceID                Description                  Model             DeviceInfo       
    ________    ___________________________________    __________    _______________________

     "Dev2"     "National Instruments(TM) USB-6509"    "USB-6509"    [1×1 daq.ni.DeviceInfo]
     "Dev3"     "National Instruments(TM) USB-6211"    "USB-6211"    [1×1 daq.ni.DeviceInfo]

Create DataAcquisition Object

Create a DataAcquisition object d for a NI device using the daq function.

 d = daq("ni")
DataAcquisition using National Instruments(TM) hardware:

                     Running: 0
                        Rate: 1000
           NumScansAvailable: 0
            NumScansAcquired: 0
              NumScansQueued: 0
    NumScansOutputByHardware: 0
                   RateLimit: []

After you create a DataAcquisition object, add channels using the addinput and addoutput functions.

Add Channels to DataAcquisition Object

Add an analog input channel, and view the DataAcquisition channel list:

addinput(d,"Dev3","ai0","Voltage")
d.Channels
    Index    Type    Device    Channel    Measurement Type          Range              Name   
    _____    ____    ______    _______    ________________    __________________    __________

      1      "ai"    "Dev3"     "ai0"     "Voltage (Diff)"    "-10 to +10 Volts"    "Dev3_ai0"

Change Channel Properties

Change the TerminalConfig channel property to 'SingleEnded', and view the updated configuration. For more information, see Channel Properties.

d.Channels.TerminalConfig = "SingleEnded";
d.Channels
    Index    Type    Device    Channel      Measurement Type             Range              Name   
    _____    ____    ______    _______    _____________________    __________________    __________

      1      "ai"    "Dev3"     "ai0"     "Voltage (SingleEnd)"    "-10 to +10 Volts"    "Dev3_ai0"

See Also

Topics