The first output terminal 130 of the microprocessor 13 is connected to {HEAD ~ a first input terminal} of {TAIL ~ the trigger} 143 via a diode  
of
The first output terminal 130 of the microprocessor 13 is connected to { HEAD ~ a first input terminal } of { TAIL ~ the trigger } 143 via a diode
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH