Arduino 2560 with Bluetooth device

[system]

Dear PaulS:
Thanks for you rapid reply
I am sorry that the problem still exist. The monitor keep showing blank(nothing) and à when I change int to char.
Is there hardware or software problem ?

Thanks again
Jay

Here is my modified code:

char BTread;

void setup()
{
  Serial.begin(57600); 
  Serial1.begin(57600);
}
void loop()
{
 if (Serial1.available() > 0) 
 {
 BTread =Serial1.read();
 Serial.println("");
 Serial.println(BTread);
 }
}

The attach file is the monitor screen