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    Missing REQUIRED setting for BAUD at Foo.pm line 35
write_settings failed, closing port at Foo.pm line 35
Failed to write settings at Foo.pm line 35.
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    my $Serial = new Win32::SerialPort('COM1') or die "Serial port died";
$Serial->baudrate(115200);
$Serial->parity('none');
...
$Serial->error_msg(1);
$Serial->user_msg(1);
$Serial->write_settings || die "Failed to write settings";