Why my 4*4 digital signal can not work normally?

[leo321]

Dear ALL,

Hello everyone! I am trying to output 4*4 digital data (4bit : 0000~1111) with PCI6221 and the data will be sent to 4 outside shift register through data pin and then the data will be transferred into parallel data (for example output 15, that is 1111, then the output of shift register should be 1-1-1-1). After that the parallel digital data will be sent to 4 DACs. I got 4 analog inputs to test the results with the other IO of the PCI6221.

However, when I input different data to the array of DAQmx Write, the results of DACs are not influenced. What should I do to deal with the problem? The code is as follows, is there anything wrong?

Thanks a lot!

Best,

Jason