{TAIL ~ A bit pattern} represented by the dot matrix is detected and written to generate {HEAD ~ a byte pattern} 
{ TAIL ~ A bit pattern } represented by the dot matrix is detected and written to generate { HEAD ~ a byte pattern }
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD