A timeout occurred before the Terminator was reached. first

Question

samir 2012-4-2

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/34257-a-timeout-occurred-before-the-terminator-was-reached-first

评论： kiarash 2021-4-29

ok this is my code

s=serial('com5');
set(s,'BaudRate',9600,'DataBits', 8, 'Parity', 'none','StopBits', 1, 'FlowControl', 'none','Terminator','CR');
fopen(s);
while(1)  
    fprintf(s,'0');
    pause(0.5);
    data=fscanf(s);
    data=str2num(data);
    display(data);
    if(data<=10)                   
            fprintf(s,'1');
            pause(0.5);
            fprintf(s,'2'); 
            pause(0.5);
            fprintf(s,'3');            
            pause(0.5);
             fprintf(s,'0');
            pause(0.5);
            data=fscanf(s);
            data=str2num(data);
            display('first');
            i=0;
            if(data<=10)
                fprintf(s,'2');
                pause(0.5);
                i=i+1;
            end  
            display('second');              
    end
end

fprintf(s,''1') fprintf(s,''2') fprintf(s,''3') are just commands sending in one direction so no returned data is excepted

fprintf(s,''0') sends a command to a roboter to use his pingsenzor the roboter returns a value stored in data(by the way the returned data from the roboter is [DEC distance, CR] -dec meaning decimal ,distance - variable,CR - terminator)

if the returned value is <10 then try to avoid the object.When i use a second time fprintf(s,'0') i always get the message

Warning: A timeout occurred before the Terminator was reached. first last

so why does this always appears the second time and how to avoid it.

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Hoang Nguyen 2015-9-17

I had the same your error when arduino uno was interfacing with matlab :(. I don't know how to solve this problem

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Answer 1

samir 2012-4-2

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https://ww2.mathworks.cn/matlabcentral/answers/34257-a-timeout-occurred-before-the-terminator-was-reached-first#answer_42960

ok i put an puase (2) before fprintf(s,'0'); and it works now wihtout the error.Don't know why it works now or why it didn't work earlier but at least it works now

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Answer 2

Hoang Nguyen 2015-9-17

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/34257-a-timeout-occurred-before-the-terminator-was-reached-first#answer_192748

hi every body! i used "Encoder Read" block in simulink to read value encoder of my motor. but if my motor operate with hight speed then following error occurred: "Error evaluating registered method 'Outputs' of MATLAB S-Function 'msfun_arduino_encoderread' in 'DaoChieuDongCo/Encoder Read'. The following is the MATLAB call stack (file names and line numbers) that produced this error: ['C:\MATLAB\SupportPackages\R2013b\ArduinoIO\simulink\msfun_arduino_encoderread.m'] [100]

Caused by: Invalid assignment in 'DaoChieuDongCo/Encoder Read': attempt to assign a matrix to a vector" so, how do i solve this error?