The function dio_tcsetattr() sets the terminal attributes and baud rate of the open resource. The currently available options are
'baud' - baud rate of the port - can be 38400,19200,9600,4800,2400,1800,1200,600,300,200,150,134,110,75 or 50, default value is 9600
'bits' - data bits - can be 8,7,6 or 5 default value is 8
'stop' - stop bits - can be 1 or 2 default value is 1
'parity' - can be 0,1 or 2 default value is 0
Note: This function was introduced in PHP 4.3.0.