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