Serial Port Reading with matlab

clear all;

p=serial('COM2','BaudRate',9600,'DataBits',8);
set(p,'Parity','none');
set(p,'Terminator','LF');
fopen(p);

son=100;

figure 
xlabel('zaman')
ylabel('veri')
title('veri okuma')
grid on;
hold on;

for t=1:1:son

      ylim([0 50])
      xlim([1 100])
      veri=fscanf(p,'%f');
      plot(t,veri);
      drawnow
  end

fclose(p);
delete(p);
clear all

I want to read volue from seria port and with plot I wanna see graphic but there is a warning

 Unsuccessful read: A timeout occurred before the Terminator was reached.

I dont solve problem.Help

Answer 1

[Walter Roberson]

Either the remote device is not active, or it is not using 9600 baud, or it is not using LF as its line terminator, or it is not responding to you (such as if it is waiting for you to say something to it first.) Or there could be a cabling problem.

[yasin]

thank you for answer , I understand you word problem isn't my code right? device cause the problem or wrong properties

[Michael]

I also have the same problem here.. at first, it didn't show any warning and worked completely fine.. but then after around 5hours, I got this problem : warning Unsuccessful read: A timeout occurred before the Terminator was reached. Can someone help please??