fd
- The file descriptor returned by dio_open().
options
- 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.