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