NI 9263 cDAQ1 gives the output signal just between -5 to +5 Volt instead of +/-10, using Matlab ICT

During a laboratory test I use an NI 9263 instrument for giving +/-10 V to an MTS MicroConsole. Somehow, the qued output data, that is between -10 and +10 Volts, just appeared to cause displacements that would belog to +/-5 V output signal. It seems, that the used MatLab functions halves my signal... I have not changed the range of the instrument (as it states as well), and the controlling program given with the NI device gives good results, as well, as a simple 9V baterry. This why I would say, that the error is somewhere inside the code...

if true
% controlling NI 9263 DAQ
% function
x=0:0.001:10; %--> signal is 10s long
y=sin(x)*9; %--> sine with a +/-9 amplitude
%    plot(x,y);title('signal');
% Getting the device
daq.getDevices()
% result:
%         cDAQ1Mod1: National Instruments NI 9263
%            Analog output subsystem supports:
%               -10 to +10 Volts range
%               Rates from 0.0 to 100000.0 scans/sec
%               4 channels
%               'voltage' measurement type
% 
%         This module is in chassis 'cDAQ1', slot 1
%
% que the data
s = daq.createSession('ni');
s.addAnalogOutputChannel('cDAQ1Mod1', 'ao0', 'voltage'); %in R2014b 'Voltage' !!!
s.queueOutputData (y');
% start the signal
s.startForeground;
% end of signal
s.removeChannel(1)
end

Thenk You for any help! Bests!