cat MyFile > /dev/ttyS1 hangs second time it is launched

[DI BACCO ANTONIO - technolabs]

I tried to execute the command in the subject.
First time I launch it, it is successfull.
Second time it hangs when closing /dev/ttyS1, third time and subsequent times it clocks on opening /dev/ttyS1.
The same happen on /dev/ttyS0.
Is it necessary to save termios and restore them before closing the serial port?

Why?

Bye,
Antonio.
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