The presence or absence of {HEAD ~ power voltage VDD supply} from the terminal 12 side is determined from {TAIL ~ the output} of detector 33 
The presence or absence of { HEAD ~ power voltage VDD supply } from the terminal 12 side is determined from { TAIL ~ the output } of detector 33
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH