Error Dialog Box for Serial Communication

Question

Shawn Chang 2012-11-14

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/53684-error-dialog-box-for-serial-communication

Hi all, is that any possible way to display the error dialog box whenever the desired port to be connected is currently not available.

Currently my code is write as following which will connect the 'COM6' directly when the button callback. I wish to write it in such a way, if the 'COM6' is currently no available, it will display an error message. Any solution to do so? Thanks you.

    instrreset;              
    s_port=serial('COM6','BaudRate',115200,'Parity','none'...             
     ,'DataBits',8,'FlowControl','none');
    set(s_port,'InputBufferSize',11,'OutputBufferSize',11,'Timeout',1);
    fopen(s_port);                         
    fprintf(s_port,'s');
    fgetl('%s',s_port);
    fclose(s_port);

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Answer 1

Jan 2012-11-14

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/53684-error-dialog-box-for-serial-communication#answer_65341

在 MATLAB Online 中打开

Unfortunately the documentation of serial does not explain what happens, if the port cannot be opened. Therefore I guess:

try
  s_port=serial('COM6','BaudRate',115200,'Parity','none', ...
                'DataBits',8,'FlowControl','none');
catch
  errordlg(...)
  return;
end

Or:

s_port = serial('COM6','BaudRate',115200,'Parity','none', ...
                'DataBits',8,'FlowControl','none');
if isempty(s_port)  % or what ever, please simply test this
  errordlg(...)
  return;
end