Xbee communication problem with arduino

I have 2 Xbee Series modules, one set to Coordinator AT (Connected to PC with XCTU via USB dongle) and other set to Router AT(Connected to Arduino is connected to PC USB… RX>TX TX>RX and 5V GND)

http://continentalee.com.sg/xbee-adapter
My xbee adapter

I have the programme uploaded into Arduino, a very simple sketch to test xbee wireless communication.

char msg = ' '; //contains the message from arduino sender
const int led = 13; //led at pin 13


void setup() {
Serial.begin(9600);//Remember that the baud must be the same on both arduinos
pinMode(led,OUTPUT);
}
void loop() {
while(Serial.available() > 0) {
           msg=(char) Serial.read();
 
           if(msg=='H') {
               digitalWrite(led,HIGH);
           }
           if(msg=='L') {
                digitalWrite(led,LOW);
           }
delay(1000);
}
}[code]

The problem comes.

When I type "H" in the Serial Com, the led light up, and the letter "H" appears in the XCTU console.

however, when I type something into the XCTU console, nothing appears on my Serial comm.

Thank you for your help in advance.

sketch_jul02a.ino (720 Bytes)