xBee communication Arduino to Arduino

_x000D_ _x000D_ I have a realy weird problem with my xBee S1 Pro moduls. I used the XCTU software to configure them. I set one Arduino to recive data and the other one to transmit. When i use the XCTU Software to send some testframes, it works, the reciver gets the data. But if i want my arduinos to communicate it dosent work. I assume that the moduls are configured the right way because PC -> Arduino works. So i'll provide the Sketches so you can tell me whats going wrong reciver void setup() { pinMode(13, OUTPUT); Serial.begin(9600); } void loop() { if(Serial.available() > 0){ digitalWrite(13, HIGH); delay(500); digitalWrite(13, LOW); Serial.print("recived some data: "); Serial.println(Serial.read()); Serial.flush(); } } and now the sender void setup() { pinMode(13, OUTPUT); Serial.begin(9600); } void loop() { Serial.println("data"); Serial.flush(); digitalWrite(13, HIGH); delay(1000); digitalWrite(13, LOW); delay(4000); } whats wrong? any ideas?