function Decode(fPort, bytes) {
  var SENSOR_TEMP = (1 << 1);
  var SENSOR_RH = (1 << 2);
  var SENSOR_CO2 = (1 << 3);
  var TOTAL_DATA_SLOTS = 4;
  
  var data = {};
  var slot = 0;
  
  var sensors = (bytes[0] << 8) | (bytes[1] & 0xFE);
  
  var vBat = ((bytes[1] & 0x01) << 8) | bytes[2];
  data.Battery = vBat / 100;
  if(vBat >= 330)
      data.BatteryStatus = "Good";
  else if(vBat < 300)
      data.BatteryStatus = "Poor";
  else
      data.BatteryStatus = "OK";
  
  for(var i = 1; i < 16; i++) {
    var d = (bytes[3+(2*slot)] << 8) | (bytes[4+(2*slot)]);
    
    if(d > 0x7FFF)
        d -= 0xFFFF;    // Correct for a negative value
    
    switch(sensors & (1 << i)) {
      case SENSOR_TEMP:
        data.Temperature = d / 100;
        break;
      case SENSOR_RH:
        data.Humidity = d / 10;
        break;
      case SENSOR_CO2:
        data.CO2 = d;
        break;
      default:
        continue;
    }
    
    if(++slot > TOTAL_DATA_SLOTS)
      break;
  }
  
  return data

}