SetDataRate
status_t SetDataRate(data_rate bitsPerSecond);
serial->SetDataRate(B_9600_BPS);
fSerialPort->SetDataRate(B_1200_BPS);
fSerialPort->SetDataRate(B_9600_BPS);
fSerialPort->SetDataRate(B_1200_BPS);
fSerialPort->SetDataRate(B_1200_BPS);
fSerialPort.SetDataRate(rate);
port.SetDataRate(B_9600_BPS);