Serial Communication Issue

/*
Software serial multple serial test

Receives from the hardware serial, sends to software serial.
Receives from software serial, sends to hardware serial.

The circuit:

  • RX is digital pin 10 (connect to TX of other device)
  • TX is digital pin 11 (connect to RX of other device)

Note:
Not all pins on the Mega and Mega 2560 support change interrupts,
so only the following can be used for RX:
10, 11, 12, 13, 50, 51, 52, 53, 62, 63, 64, 65, 66, 67, 68, 69

Not all pins on the Leonardo and Micro support change interrupts,
so only the following can be used for RX:
8, 9, 10, 11, 14 (MISO), 15 (SCK), 16 (MOSI).

created back in the mists of time
modified 25 May 2012
by Tom Igoe
based on Mikal Hart's example

This example code is in the public domain.

*/

void setup() {
// Open serial communications and wait for port to open:
Serial.begin(9600);

// set the data rate for the SoftwareSerial port
Serial1.begin(9600);

}

void loop()
{ // run over and over

if (Serial1.available())
{
Serial.print(Serial1.read());
}

if (Serial.available())
{
Serial1.print(Serial.read());
}
}