query and read the status from Com port

Question

KANG 2015-5-29

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https://ww2.mathworks.cn/matlabcentral/answers/220597-query-and-read-the-status-from-com-port

评论： Ajit Singh 2020-11-2

Hi all!

I am working at the com port in order to control the optical shutter (SC10; Thorlabs) using MATLAB. While I could control it, I am looking for the way to read the optical shutter status (open or closed). There is a command 'closed?' to do this but MATLAB does not return the correct value. My code is like,,

s=serial('COM1');

s.Terminator='CR';

fopen(s);

fprintf(s,'ens');

fprintf(s,'closed?');

Ret=fscanf(s)

It would be greatly appreciated if I could get any input!

Thanks,

Kang

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Ajit Singh 2020-11-2

Dear Sir,

Could you provide the MatLab script to operate the shutter: opens for 200 mili second in every 10 seconds for 3 times.

Thank you.

Regards

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Answer 1

Dasharath Gulvady 2015-5-29

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/220597-query-and-read-the-status-from-com-port#answer_180977

You have two "fprintf" calls in the code and one "fscanf". The "fscanf" will return the result of "ens". For "closed?" execute "fscanf" one more time.