NI-DAQmx: Generate Finite Digital Pulse Train with Digital Start in .NET

This example demonstrates how to generate a finite digital pulse train  from a Counter Output Channel. The Frequency, Duty Cycle, Initial Delay,  and Idle State are all configurable. This example uses two counters.  This example shows how to configure the pulse in terms of Frequency/Duty  Cycle, but can easily be modified to generate a pulse in terms of Time or Ticks. 

Description

This example demonstrates how to generate a finite digital pulse train  from a Counter Output Channel. The Frequency, Duty Cycle, Initial Delay,  and Idle State are all configurable. This example uses two counters.  This example shows how to configure the pulse in terms of Frequency/Duty  Cycle, but can easily be modified to generate a pulse in terms of Time or Ticks. 

Instructions for Running

Select the Physical Channel which corresponds to the counter you  want to output your signal to on the DAQ device.

1. Enter the Frequency and Duty Cycle to define the pulse parameters.  Enter the Number Of Pulses into the DAQmx Timing VI to determine the  duration of the generation (Note: if the Number of Pulses is greater  than 1, the paired counter will also be used for the generation).  Additionally, you can set the Initial Delay (in seconds) which will delay  the beginning of the pulse train from the start call. Also, you can  change the Idle State to set the state the line will remain in after the  generation is stopped.  
   Note: Use the Measure Period example to verify you are outputting  the finite pulse train on the DAQ device.

Steps:

1. Create a Task object. Create a COChannel object for pulse generation in  terms of frequency. If the idle state of the pulse is set to low the  first transition of the generated signal is from low to high.
2. Configure the Triggers object to have pulse generation start on a  digital edge.
3. Use the ConfigureImplicit() method to configure the pulse generation to  be finite.
4. Call the Start() method to arm the counter and begin waiting for the  trigger to start the pulse train generation.
5. Call the Stop() method to stop the task and Dispose() method to  de-allocate any resources used by the Task.

I/O Connections Overview

This example will cause the counter to output the pulse on the output terminal of the counter specified. The default counter terminal(s) depend on  the type of measurement being taken. For more information on the default  counter input and output terminals for your device, open the NI-DAQmx Help,  and refer to Counter Signal Connections found under the Device  Considerations book in the table of contents.

Requirements

Filename: digpulsetrainfinitedigstart.zip

Software Requirements

Language(s): Visual Basic .NET, C#

Hardware Requirements

Driver: NI-DAQmx 8.6

Reader Comments | Submit a comment »