matlab serial communication A timeout occurred before the Terminator was reached

[aswathymohan]

Hi

I am planning to send some data from pic to matlab and plot the same accordingly.Pic code was working fine.I simulated it on proteus and found that the data is sending correctly.But the issue was with Matlab.It gives the following error "a timeout occured before the terminator has reached"

how to fix the problem

% Serial Data Logger
% Yu Hin Hau
% 7/9/2013
% **CLOSE PLOT TO END SESSION
 
clear
clc
 
%User Defined Properties 
serialPort = 'COM11';            % define COM port #
plotTitle = 'Serial Data Log';  % plot title
xLabel = 'Elapsed Time (s)';    % x-axis label
yLabel = 'Data';                % y-axis label
plotGrid = 'on';                % 'off' to turn off grid
min = -1.5;                     % set y-min
max = 1.5;                      % set y-max
scrollWidth = 10;               % display period in plot, plot entire data log if <= 0
delay = .01;                    % make sure sample faster than resolution
 
%Define Function Variables
time = 0;
data = 0;
count = 0;
 
%Set up Plot
plotGraph = plot(time,data,'-mo',...
                'LineWidth',1,...
                'MarkerEdgeColor','k',...
                'MarkerFaceColor',[.49 1 .63],...
                'MarkerSize',2);
             
title(plotTitle,'FontSize',25);
xlabel(xLabel,'FontSize',15);
ylabel(yLabel,'FontSize',15);
axis([0 10 min max]);
grid(plotGrid);
 
%Open Serial COM Port
s = serial(serialPort);
set(s,'BaudRate',9600,'Terminator','LF/CR','Parity','None');
disp('Close Plot to End Session');
fopen(s);
 
tic
 
while ishandle(plotGraph) %Loop when Plot is Active
     %pause(2);
    dat = fscanf(s,'%f'); %Read Data from Serial as Float
  pause(0.5);
    if(~isempty(dat) && isfloat(dat)) %Make sure Data Type is Correct        
        count = count + 1;    
        time(count) = toc;    %Extract Elapsed Time
        data(count) = dat(1); %Extract 1st Data Element         
         
        %Set Axis according to Scroll Width
        if(scrollWidth > 0)
        set(plotGraph,'XData',time(time > time(count)-scrollWidth),'YData',data(time > time(count)-scrollWidth));
        axis([time(count)-scrollWidth time(count) min max]);
        else
        set(plotGraph,'XData',time,'YData',data);
        axis([0 time(count) min max]);
        end
         
        %Allow MATLAB to Update Plot
        pause(delay);
    end
end
 
%Close Serial COM Port and Delete useless Variables
fclose(s);
clear count dat delay max min plotGraph plotGrid plotTitle s ...
        scrollWidth serialPort xLabel yLabel;
 
 
disp('Session Terminated...');