As long as the periodic pulse is detected by the slave processor, the output of {TAIL ~ the master processor} remains enabled and the output of {HEAD ~ the slave processor} is disabled 
As long as the periodic pulse is detected by the slave processor , the output of { TAIL ~ the master processor } remains enabled and the output of { HEAD ~ the slave processor } is disabled
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH 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 OTH OTH