interface Constant {

   public static final byte SYNCH = 0x1b;
   public static final byte HEADER = 0x48;
   public static final byte TRAILER = 0x54;

   // command
   public static final byte X_10 = 0x58;
   public static final byte SENSOR_STATUS = 0x53;
   public static final byte ALARM_STATUS = 0x41;

   public static final byte HOUSE_CODE = 0x60;
   public static final byte A1_ON = 0x00;
   public static final byte A1_OFF = 0x20;
   public static final byte A2_ON = 0x10;
   public static final byte A2_OFF = 0x30;
   public static final byte A3_ON = 0x08;
   public static final byte A3_OFF = 0x28;
   public static final byte A4_ON = 0x18;
   public static final byte A4_OFF = 0x38;
   public static final byte A5_ON = 0x40;
   public static final byte A5_OFF = 0x60;
   public static final byte A6_ON = 0x50;
   public static final byte A6_OFF = 0x70;
   public static final byte A7_ON = 0x48;
   public static final byte A7_OFF = 0x68;
   public static final byte A8_ON = 0x58;
   public static final byte A8_OFF = 0x78;

   public static final byte DUMMY_BYTE = 0x31;

}