Problem using surf() command in data acquisition wait(session, timeOut) !

Hi, I'm new to data acquisition toolbox. Currently I'm using the daq toolbox to generate and capture the data to and from NI 6211.

I acquire the data in background and process the data using listeners. The problem is:

When I plot the data using "plot" command, it's ok. But when using "surf" command, the timeOut of wait(session, timeOut) is not working correctly any more. It does not matter how long I set the value "timeOut" to be (e.g 20 seconds), Matlab always stop running after (approx. 3seconds).

here is my code:

Fs = 125e3;

sOut = daq.createSession('ni');

ao_0 = addAnalogOutputChannel(sOut, 'Dev1', 0, 'Voltage');

ai_4 = addAnalogInputChannel(sOut, 'Dev1', 4, 'Voltage'); ai_5 = addAnalogInputChannel(sOut, 'Dev1', 5, 'Voltage');

sOut.Rate = Fs; sOut.IsNotifyWhenScansQueuedBelowAuto = false; sOut.NotifyWhenScansQueuedBelow = Fs; sOut.IsContinuous = true;

queueOutputData(sOut, outSignal);

lhOut = addlistener(sOut,'DataRequired',@(src,event) src.queueOutputData(outSignal));

sOut.NotifyWhenDataAvailableExceeds = numSample;

lhIn = addlistener(sOut,'DataAvailable',@(src,event)myFunction);

sOut.startBackground();

wait(sOut,runningTime); delete(lhOut); delete(lhIn); end

function myFunction() plot(event.Data); %% this is ok surt(event.Data); %% this has a problem

end

.

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. Can someone help me please. Thanks