         PORTC = 0x00;
         attachInterrupt(digitalPinToInterrupt(triggerPin), ToggleLED,  CHANGE);
         
-        break;   
+        break;  
+
+	   case ('Y') : 
+		// Return device ID 
+		Serial.println("NicoLaseSequencer");
+		break;
 
 
       case ('?') : 


          // Return current shutter state
            if (shutterState){
              Serial.println('1');            
            }
            else {
              Serial.println('0');
            }

            break;

        }

        break;
	
	  default :
	  // Command not recognized. Return error character 0x15.
	      Serial.println(15, HEX);
		  
		break;



