DAQmx Change Detection Event Registration

[A_Ryan]

Overview

This code demonstrates how to capture both the rising and falling events associated with change detection.

Description

This code demonstrates how to capture both the rising and falling events associated with change detection.  By adding the boolean logic, you can now have seperate actions based upon the rising or falling edge of a signal.

Requirements

Software

• LabVIEW 2012 or compatible
• NI-DAQmx 9.5.5 or compatible

Hardware

• NI Multifunction DAQ Device

Steps to Implement or Execute Code

1. Select the physical lines and connect signal.
2. Run the program.

Additional Information or References

 

**This document has been updated to meet the current required format for the NI Code Exchange.**

 

[Jeff_Long]

Very nice example of using change detection with events!  I used this today with a USB-6525 to detect a 10ms pulse from a host machine as a start signal for my software application.

[Gardo]

-- Author has updated example adding Unregister--

Thanks.

[Åland]

 Is it by any chance possible to get this example to work with USB-6003? 

I want to fire an event when a digital in pin go HI. 

I tried this example but get an error message saying

Requested value is not a supported value for this property.

The property value may be invalid because it conflicts with another property.

Property: SampTimingType
Requested Value: Change Detection
Possible Values: On Demand

[Titen]

Hardware Compatibility Note:

Not all DAQ hardware supports Change Detection. Please view the following KB to see if your device is compatible. 

[MAILFERTSeb]

That was mostly what I wanted to do, thank you!

Is it possible to monitor events coming form multiple digital lines and then know which line creates the event in order to respond with something specific and different for ecah line?

I'm not able to know in this example which line produced the event.

Best regards.