a second device connected with the pull up voltage supply circuit and {HEAD ~ the first device} by {TAIL ~ the bus} 
by
a second device connected with the pull up voltage supply circuit and { HEAD ~ the first device } by { TAIL ~ the bus }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL