Loosing data during serial connection.

Dear All! I have a device sending data to my PC via COM port. Firstly device sends 1000 strings with data, then another info (plus 3 strings) and after all EOT symbol. I receive and process all this data on my PC using MATLAB. But MATLAB receives only 608 strings, at that the last string includes a EOT symbol. When I use a terminal programm to receive data from my device it receives all the data. Please help me to resolve this problem. And one more question: I receive data while EOT symbol is received. Is there any elegant way to catch it? Thank you!

    try
          sp = serial(currentPort, 'baudRate', 115200);
          msg = strcat(currentPort,' opened successfully!');
          fopen(sp);

          set(handles.state, 'ForegroundColor', [0, 1, 0]);    
          set(handles.state, 'String', msg);

      catch ME
          set(handles.state, 'ForegroundColor', [1, 0, 0]);
          set(handles.state, 'String', 'Error');
          fclose(sp);
          msg = strcat(currentPort,' CLOSED!');
          set(handles.state, 'ForegroundColor', [0, 0, 0]);    
          set(handles.state, 'String', msg);
          delete(sp);
          clear sp;
      end;
      %----------DATA aquisition&Processing----------
      %----------------------------------------------
      try
          fprintf(sp, 'r');
          set(handles.state, 'String', 'Aquiring data...');
          i = 1;
          while(sp.BytesAvailable)

              receivedChar = fscanf(sp);
              msg = strrep(receivedChar, ';', ' ');
              msg = strrep(msg, ':', ' ');
              if(str2num(msg))
                  numOfData = numOfData + 1;
              end;

              if(contains(msg, 'key'))            
                  numOfKeys = numOfKeys + 1;
              end; 

              dataCells{i,1} = msg;
              i = i + 1; 
              disp(dataCells);   
          end;   
      catch ME
          set(handles.state, 'ForegroundColor', [1, 0, 0]);
          set(handles.state, 'String', 'Error');
          fclose(sp);
          msg = strcat(currentPort,' CLOSED!');
          set(handles.state, 'ForegroundColor', [0, 0, 0]);    
          set(handles.state, 'String', msg);
          delete(sp);
          clear sp;
      end;
      keys = zeros(numOfKeys, 1);
      time = zeros(numOfData,1);
      dataODS10L = zeros(numOfData,1);
      dataODS96 = zeros(numOfData, 1);
      k = 1;
      l = 1;
      try
      set(handles.state, 'String', 'Data processing...');
      for i = 1 : size(dataCells)    
          if((~isempty(dataCells{i,1})))
              if(contains(dataCells{i,1}, 'key'))
                  [keyToken, keyRemain] = strtok(dataCells{i, 1}, ' ')        
                  keys(k) = str2double(keyRemain);
                  k = k + 1;
              end;       
              [data, status] = str2num(dataCells{i,1});
              if(status)        
                  time(l) = data(1);
                  dataODS10L(l) = data(2);
                  dataODS96(l) = data(3);
                  l = l + 1;
              end;
          end;
      end;
      catch ME
          set(handles.state, 'ForegroundColor', [1, 0, 0]);
          set(handles.state, 'String', 'Error');
          fclose(sp);
          msg = strcat(currentPort,' CLOSED!');
          set(handles.state, 'ForegroundColor', [0, 0, 0]);    
          set(handles.state, 'String', msg);
          delete(sp);
          clear sp;
      end;
      fclose(sp);
      delete(sp);
      clear sp;

Answer 1

[Walter Roberson]

When you use rates beyond 9600 with actual rs232 then you will typically lose data unless you turn on hardware flow control.

This consideration is not relevant for serial emulated over USB.

[Vic Bay]

I use USB-UART converter. But I've tried to set BR 9600. Has no effect

[Vic Bay]

My Bad. You were right! Decreasing baud rate to 9600 value helped! Thank you!