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Error using fclose Invalid file identifier. Use fopen to generate a valid file identifier.

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David Pereira
David Pereira 2017-3-14
评论： Walter Roberson 2017-3-14
Hello,
My code is:
% Find a serial port object.
obj1 = instrfind('Type', 'serial', 'Port', 'COM3', 'Tag', '');
obj1.Baudrate=115200;
obj1.Timeout=2000;
obj1.Terminator='CR';
% Create the serial port object if it does not exist
% otherwise use the object that was found.
if isempty(obj1)
obj1 = serial('COM3');
else
fclose(obj1);
obj1 = obj1(1)
end
% Connect to instrument object, obj1.
fopen(obj1);
%send message
fprintf(obj1,'#1Zmt\r');
%read the command
fscanf(obj1)
Could you please help me? If I use the tmtool first,connect to the instrument and then Run this code, it will work. But if I open Matlab and try to run it, it gives me this error.
Thank you
  1 个评论
Walter Roberson
Walter Roberson 2017-3-14
Your code does not check that the fopen works, but you should be checking that it works before trying to use the port
I do not know why it is failing

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