Serial Port Reading with matlab

Question

yasin 2012-12-16

1
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/56730-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

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Answer 1

Walter Roberson 2012-12-16

1
链接

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https://ww2.mathworks.cn/matlabcentral/answers/56730-serial-port-reading-with-matlab#answer_68673

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.

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yasin 2012-12-17

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

Michael 2013-2-10

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??

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