DAQ change detection function that returns a BCD to indicate which lines have had state changes

[zo999]

Hi,

It was recommended to me to use the DAQ change detection function that returns a BCD to indicate which lines have had state changes. Does anyone know of this function, and it it is DAQmx or Traditional DAQ?

Thank you.

Danielle

[B_Sherm]

Danielle,

Check out this link which gives an overview of change detection using NI-DAQmx. It depends mostly on your hardware.

http://www.ni.com/white-paper/4102/en/

[zo999]

Hi Brad,

I saw that white paper before. I am just looking for the name of the method described above. I have a USB 6509. I am using C, not labview.

Best,

Danielle

[B_Sherm]

There are text based examples that install when you install DAQmx. They are located at Start » All Programs » National Instruments » NI-DAQ » Text-Based Code Support » ANSI C Examples » Digital » Read Examples. There will be examples on how to do change detection in C. 

If they are not installed follow the instructions here to install them.

http://digital.ni.com/public.nsf/allkb/E3BAF6FC4017960B8625755A00525D37

Here is a link to the C Reference Help for DAQmx Functions

http://digital.ni.com/manuals.nsf/websearch/6A79EF4F9F30AFC086257A4400600861