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