The control function can be located in either or both of {HEAD ~ the RFID reader} and {TAIL ~ the gateway} 
The control function can be located in either or both of { HEAD ~ the RFID reader } and { TAIL ~ the gateway }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL