DAQmx Digital waveform generation

Hello,

I have a problem generating a digital waveform on a digital output of my acquisition card.

I create a digital output task, with a clock (I don't know which one to use because I didn't understand this point).

Then, starting from a waveform of 750 points, I enter the data in the output buffer, start the task and repeat the data transmission as long as I need (number of repetitions) and close the task.

No data is generated.

Depending on the values I put in the sample clock rate, it crashes.

In short, I need your help.

I've attached an example where I've tried to set the minimum of elements,

Thanks a lot