Communication device with {HEAD ~ circuitry} to promote {TAIL ~ cascade series connection} including identification of device position in the series and sensing the end device in the series 
to promote
Communication device with { HEAD ~ circuitry } to promote { TAIL ~ cascade series connection } including identification of device position in the series and sensing the end device in the series
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH