//for class
    public void ReadComprateJSON(object data)
    {
        item = data as SPAPItem;

        //Example Read Data : {"Right":1.0,"Center":0.5,"Left":0.0}
        Debug.Log(string.Format("C:{0}, R:{1}, L:{2}",
                                item.Center,
                                item.Right,
                                item.Left));
    }
 // Update is called once per frame
 void Update()
 {
     if (serialPort != null)
     {
         if (Input.GetKeyDown(writeKey))
         {
             SPAPItem itobj = new SPAPItem();
             itobj.Center = 0.0f;
             itobj.Right  = 0.0f;
             itobj.Left   = 0.0f;
             serialPort.WriteJSON(itobj);
         }
     }
 }