A.發(fā)送數(shù)據(jù)/接收數(shù)據(jù)/供電/地線 B.接受數(shù)據(jù)/發(fā)送數(shù)據(jù)/地線/供電 C.發(fā)送數(shù)據(jù)/接收數(shù)據(jù)/地線/供電 D.接收數(shù)據(jù)/發(fā)送數(shù)據(jù)/供電/地線