uart problem can't receive

i trying send decimal number can't receive anything. here code send on 1 arduino:

code: [select]


// sends "a"s through serial port every second

// 'setup' function
void setup()
{
 // start uart @ 9600 bits-per-second (baud)
 serial.begin(9600);
}

// main loop
void loop()
{
 // print through uart
 serial.print(2);

 // pause 1 second
 delay(1000);
}



here receive other arduino:

code: [select]


int incomingbyte = 0;      // incoming serial data

void setup() {
     serial.begin(9600);      // opens serial port, sets data rate 9600 bps
}

void loop() {

     // send data when receive data:
     if (serial.available() > 0) {
           // read incoming byte:
           incomingbyte = serial.read();

           // got:
           serial.print("i received: ");
           serial.println(incomingbyte);
     }
}


any more welcome!! know simple problem. oh , have tx on 1 rx on other , vice versa.

do have common "ground" connection ?

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