the pull up voltage supply circuit supplies the pull up voltage equal to the first predetermined voltage to the first device via the bus during the standby state, while supplying the pull up voltage equal to the second predetermined voltage to {TAIL ~ the first device} and {HEAD ~ the second device} via the bus during the power ON state; and 
the pull up voltage supply circuit supplies the pull up voltage equal to the first predetermined voltage to the first device via the bus during the standby state , while supplying the pull up voltage equal to the second predetermined voltage to { TAIL ~ the first device } and { HEAD ~ the second device } via the bus during the power ON state ; and
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH