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I can't change the baud rate of ttyS0 and ttyS1 from 115200. I want to change the baud rate to 9600 because the baud rate of POS printer is 9600.

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The stty command handles that:

sudo stty -F /dev/ttyS0 9600

You can confirm that you succeeded in changing the baud rate by asking stty to print out the current settings with:

sudo stty -F /dev/ttyS0 -a

See man stty for more details.

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