Closing an RS232 serial port connection, if open

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Jason
Jason 2015-3-12
评论： Jason 2015-3-13
Hello. I am using the following code to open, send a command and receive a response - it works fine:
s = serial('COM1');
set(s,'BaudRate',4800);
fopen(s);
fprintf(s,'o')
out = fscanf(s);
What is the best way to close, delete or remove the serial object to prevent my external device hanging up:
I have an exit button where I would need to pass the s serial object and then do what ever is the appropriate operation. However, not all of the times I open the coms port, so I would need to account for cases where the coms port is not open.
Thanks for any advice. Jason

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