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