'Set break: Controls TXD. When active, to transmitting is
possible.'

def _update_break_state(self):

    if (not self.is_open):
        raise portNotOpenError
    if self.logger:
        self.logger.info('set    BREAK    to    {}'.format(('active' if self._break_state else 'inactive')))
    if self._break_state:
        self.rfc2217_set_control(SET_CONTROL_BREAK_ON)
    else:
        self.rfc2217_set_control(SET_CONTROL_BREAK_OFF)
