Error Dialog Box for Serial Communication

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Shawn Chang
Shawn Chang 2012-11-14
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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采纳的回答

Jan
Jan 2012-11-14
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

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