I want to run my program with continuous aquisition and write data to file when a button is pressed and get the most recent samples from the DAQ board.

[HAL]

This is an update to a question I asked earlier. I am still trying to solve the problem. I have included a zip file with a library file. The file to open in pj_pushbutton.vi. I have placed comments explaining the issues and problems in this vi and the subvi's.

When I push my button to write the data to file I think it is writing the data that has already been stored in the buffer and writing to file all at once. I want the data that is taken from the DAQ board from the time that I press the Write File button. How do I do this?

[Sastry V.]

Hi,

1. In AI read, you need to set the Read/Search option to "Relative to End of Data".

2. Next you should not start AI Read VI until you press the Write to File. I am attaching an example VI below. Please see if it helps.

Regards,
Sastry V
applications Engineer
National Instruments