Error using fclose Invalid file identifier. Use fopen to generate a valid file identifier.
2 visualizzazioni (ultimi 30 giorni)
Mostra commenti meno recenti
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 Commento
Walter Roberson
il 14 Mar 2017
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
Risposte (0)
Vedere anche
Categorie
Scopri di più su Instrument Connection and Communication in Help Center e File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!