'SERIAL_9O1' was not declared in this scope

hier ein Ausschnitt aus dem Code:

void setup() {
  Serial.begin(9600, SERIAL_9O1);         // Set up a serial line for 9-bit serial with odd parity
  mySerial.begin(9600);                   // set the data rate for the SoftwareSerial port
  pinMode(LED_PIN, OUTPUT);               // set pin to output
  pinMode(SWITCHPIN, INPUT_PULLUP);       // set pin to input; this pin decides, if receiver-voltage or sensor-values will be read...
  while (zeiger < 33) {
    zeichenKette[zeiger] = ' ';
    zeiger++;
  }
  delay(3000);  	                      // kurz warten  
}

und die Fehlermeldung:

Jeti2Frsky_0C1:124: error: 'SERIAL_9O1' was not declared in this scope

   Serial.begin(9600, SERIAL_9O1);         // Set up a serial line for 9-bit serial with odd parity

                      ^

exit status 1
'SERIAL_9O1' was not declared in this scope

@Serenifly

wo kann ich dies von Hand auf 9 Bits stellen?

Gruß Dirk