Continous Digital output express vi gives error -200609

[heel]

Using Express vi to generate continuous output on two digital ports of NI USB-6341 - extremely basic:

To test, I simply right-click create a control at the data input of the express-vi and types in some data manually.

There are two digital lines dev1/port0/line0 and dev1/port0/line0 so I would expect this input to be an array of two digital waveforms each with one line of data. Right?

Below  is what it looks like and the error I get. Sample rate is set at 1kHz. 

In the express vi, #samples to read is set at 4 (as wfm has) or 1k - it gives the same error.

1. How can I fix this without going _inside_ the generated express code and change the buffer size, which I would like to avoid.
2. Is the express vi generator broken for this particular - yet very simple and basic setup?

[crossrulz · Accepted solution]

The error is quite clear.  You have to give at least 2 samples.  So change your waveform data to have a second data point for each digital waveform.  You can just make it the same as the first data point.

[heel]

Thanks crossrulz,

Time evolves vertically not horizontally in a digital waveform control/indicator - as I implicitly assumed.

then the express vi works. Thanks for the tip