Syntax Error with if statement expression block

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Batool Khader 2021-3-3

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https://ww2.mathworks.cn/matlabcentral/answers/762081-syntax-error-with-if-statement-expression-block

回答： Shiva Kalyan Diwakaruni 2021-3-10

I am trying to read the queried data from a serial COM port using Instrument Query block from Instrument Control Toolbox, where the input being queried is supposed to be one character such as 'C'. I would like to use the queried data in an if-statement block such that if it's equal to a certain character, then the model connected to the output is enabled and runs. However, since the queried data is in ASCII format, I added ASCII to String block to do the conversion. Despite all that, I get a syntax error as shown in the figure below. Could the issue be in my If expression?

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Shiva Kalyan Diwakaruni 2021-3-10

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https://ww2.mathworks.cn/matlabcentral/answers/762081-syntax-error-with-if-statement-expression-block#answer_643937

Hi,

The 'If' block cannot accept a signal of type string.It supports only

Data Types: single | double | int8 | int16 | int32 | uint8 | uint16 | uint32

Instead you can use stringcompare block

https://www.mathworks.com/help/simulink/slref/stringcompare.html

or

compare to constant block

https://www.mathworks.com/help/simulink/slref/comparetoconstant.html

hope it helps,

thanks

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