A scanning device 1, wherein {HEAD ~ the data} encoded by the tags is redundantly encoded and the processor uses the redundantly encoded data to detect {TAIL ~ one or more errors} therein 
A scanning device 1 , wherein { HEAD ~ the data } encoded by the tags is redundantly encoded and the processor uses the redundantly encoded data to detect { TAIL ~ one or more errors } therein
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH