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Chapter 2 Installation and Configuration
© National Instruments Corporation 2-17 NI PXI-1052 User Manual
In Traditional NI-DAQ, you configure virtual channels using MAX. In
NI-DAQmx, you can configure virtual channels with the DAQ Assistant,
which you can open from MAX or your application software. You also can
configure virtual channels with the NI-DAQmx API in your application
program.
A task, an important new concept for NI-DAQmx, is a collection of one
or more virtual channels with timing, triggering, and other properties.
Conceptually, a task represents a measurement or generation you want to
perform. You can set up and save all of the configuration information in a
task and use the task in an application.
In NI-DAQmx, you can configure virtual channels as part of a task or
separate from a task. Virtual channels created inside a task are local
channels. Virtual channels defined outside a task are global channels. You
can create global channels in MAX or in your application software and then
save them in MAX. You can use global channels in any application or add
them to a number of different tasks. If you modify a global channel, the
change affects all tasks in which you reference that global channel. In most
cases, it is simpler to use local channels.
Configure a Task in NI-DAQmx
Configure tasks with the DAQ Assistant. You must have version 7.0 or
later of an NI application software package to create tasks and channels
with the DAQ Assistant.
• In MAX, right-click Data Neighborhood and select Create New.
In the Create New window, select NI-DAQmx Task and click Next.
• You also can open the DAQ Assistant directly from within
NI application software.
– In LabVIEW, there are several ways to open the DAQ Assistant.
• Drop the DAQ Assistant Express VI from the Express Input
palette, as described in the Getting Started with LabVIEW
document.
• You also can use the DAQmx Task Name control to open the
DAQ Assistant. Right-click the control and select New Task.
The Taking an NI-DAQmx Measurement in LabVIEW tutorial
has step-by-step instructions on how to create a task from the
DAQmx Task Name control and generate code for the task.
In LabVIEW, select Help»Taking an NI-DAQmx
Measurement to open the tutorial.