What is the 'NotifyWhe​nScansQueu​edBelow' in session based interface?

2021 7 7
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Hi all,
I've studied and tested ni-daq device.
But I can't understand what is the 'NotifyWhenScansQueuedBelow' feature.
s = daq.createSession('ni');
addAnalogOutputChannel(s,'Dev1',0,'Voltage');
outputData = (linspace(-1,1,1000))';
s.queueOutputData(outputData);
s.NotifyWhenScansQueuedBelow = 500;
lh = s.addlistener('DataRequired', ...
@(src,event)disp(1));
startForeground(s);
So I tried some code like this to check when the 'NotifyWhenScansQueuedBelow' work.
I thought it would display '1' when NotifyWhenScansQueuedBelow work, but it doesn't happen.
I changed value of 'NotifyWhenScansQueuedBelow', But nothing happened.
Please let me know what is this, and how can I apply this in practice.

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