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