Fio Xbee communication Problems

Hey Guys,
i have some Problems with the communication between the Fio (with a Xbee Modul on it) and the PC. The Setup Function works well, but if i have opened the Serial Monitor an type something, it doesn´t reach the Fio... If i remove the Xbee the communication works fine,but with the Xbee on it, it doesn´t work. I think the Problem is that the Xbee and the Fio use the same Rx,Tx Pins! But there must be a way to communicate over the Xbee with the Fio & the PC.. Hope you understand my Problem... Greetings, Ruediger

char x;
void setup() {
 
   Serial.begin(9600);
   Serial.println("A3000#");
  
}

void loop() {
   
  if (Serial.available() > 0) {
   
     x = Serial.read();
     Serial.print(x);
    
  }
}

Ps: For better understanding an Example:
I want to send an 'A' from the PC to the Fio which send´s the 'A' over the Xbee in the Air..