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The following code snippet shows its use for an internal clock running at hz. If the task is currently running, the function first stops the task and then releases all of its resources. NI recommends the Typical Installation to ensure that all dependent software is installed. Before you begin using your DAQ software, you must install your application development environment first, and then your driver software.
After instanting a new Task object, creating and assigning an AIChannel object is done by calling the appropriate member function in the Channel class. Although it is not always required, using the NI-DAQmx Start Task function to explicitly start a task involving a hardware-timed acquisition or generation is preferred.
Because NI-DAQmx is multithreaded, multiple data acquisition operations can occur simultaneously, significantly improving the performance of your applications that contain multiple operations. With this overhead removed, both configuration and acquisition are optimized.
NI-DAQmx Software – National Instruments
Specifying a number of samples per channel of -1 for a continuous acquisition results in the function reading all of the samples that are currently available in the buffer when the function kabview. For operations that require sample timing analog input, analog output, and counterthe Sample Clock instance of the NI-DAQmx Timing function sets both the source of the sample clock, which could be an internal or external source, and its rate.
Based on the parameters sent to the ConfigureDigitalEdgeTrigger labvkew the device will look to in an internal or external line for a rising or falling digital edge before it begins to acquire data. These instances correspond to the specific type of measurement or generation the virtual channel s perform.
Otherwise, the task performance will be reduced because it will be repeatedly started and stopped. If prompted to choose the installation directory for your NI software, this should be the same root directory where you installed LabVIEW. An NI-DAQmx task is a collection of virtual channels, timing and triggering information, and other properties regarding the acquisition or generation.
The following code snippet shows the use of the Start function. Back to Top 2. This programming pattern is similar to the pattern used dqmx the.
Digital output channels— DOChannel class.
In the running state, the task performs the specified acquisition or labveiw. Furthermore, since the number of samples per channel input has been wired to a constant value of 10, each time the VI executes it will read 10 samples from each virtual channel. To start a task use the Start function in the Task object. One of the ways NI-DAQmx saves development time is by providing an API that requires only a small number of functions to daqqmx the majority of its functionality.
Learn 10 Functions in NI-DAQmx and Handle 80 Percent of Your Data Acquisition Applications
Rate this document Select a Rating 1 – Poor 2 3 4 5 – Excellent. Albview uses an exchange of request and acknowledge timing signals with an external device to transfer each sample. Then, the source of the sample clock is read. When using the NI-DAQmx Trigger function, all valid trigger signals are available as the source input to the function.
For example, in the following DAQmx Timing VI, the analog output sample clock signal labvew the device is available as the source of the sample clock for the analog input channels, without any explicit routing being performed. Others require multiple devices to be synchronized. This state model consists of five states in which a task can reside.
NI-DAQmx automatically performs this routing. If the acquisition or generation does not complete within this amount of time, the function exits and an appropriate error is generated.