{HEAD ~ The preset time window} for each sensor can be viewed as {TAIL ~ the address} of the sensor 
viewed as
{ HEAD ~ The preset time window } for each sensor can be viewed as { TAIL ~ the address } of the sensor
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH