How to generate +5V signal using matlab?

Hi, i want to generate continuous +5V signal for 3 seconds from NI DAQ device.

s=daq.createSession('ni');
addAnalogOutputChannel(s,'Dev1',0,'Voltage');
addAnalogOutputChannel(s,'Dev1',1,'Voltage');
t=0:0.001:3;
w=6;
outputSignal=0.5*rectpuls(t,w)';
queueOutputData(s,[outputSignal outputSignal]);
s.startForeground

However it does not work properly, anyone can tell me is there anything wrong with the code?