{HEAD ~ the first device} is driven by the first power supply, and capable of performing {TAIL ~ a communication} via the bus in the condition in which the pull up voltage is equal to either of the first predetermined voltage and the second predetermined voltage, 
capable of performing
{ HEAD ~ the first device } is driven by the first power supply , and capable of performing { TAIL ~ a communication } via the bus in the condition in which the pull up voltage is equal to either of the first predetermined voltage and the second predetermined voltage ,
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL 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