Why do I fail to communicate with an external device using "serialport" in a script but not in the command window?

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MathWorks Support Team 2021-9-15

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https://ww2.mathworks.cn/matlabcentral/answers/1454624-why-do-i-fail-to-communicate-with-an-external-device-using-serialport-in-a-script-but-not-in-the-c

编辑： MathWorks Support Team 2023-7-21

I am using the "serialport" command to connect to my external device like an Arduino board. The code doesn't work when I try to run it as script, but works when I run them line by line in the Command Window. Why is that?

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Answer 1

MathWorks Support Team 2023-7-21

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https://ww2.mathworks.cn/matlabcentral/answers/1454624-why-do-i-fail-to-communicate-with-an-external-device-using-serialport-in-a-script-but-not-in-the-c#answer_788804

编辑：MathWorks Support Team 2023-7-21

Please try to add in a "pause(5)" after the object creation and see if it helps. The device might need some time to be in the correct state before you send data to it.

Running a command from a script and Command Window should give the same result. The only difference in your two executions of your code is the time between executions of each line.