The electronic circuit 2 wherein {HEAD ~ the communications pin} is {TAIL ~ a serial communications protocol signal pin} 
is
The electronic circuit 2 wherein { HEAD ~ the communications pin } is { TAIL ~ a serial communications protocol signal pin }
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL