To transmit and receive different kinds of data signals under reduced wiring for carrying and controlling the same while connecting a master to each slave corresponding to each conveyer with a serial line in a conveyer system.

A communication master part 301 of a carrying control part 300, a main conveyer line 101, carrying conveyer lines 111-113 and communication slaves 401, 402, 403 of carrying-out conveyer lines 121, 122 are connected with a serial line L0, and various kinds of data signals to a motor roller carrying an object to be carried by the packet exchange system and a corresponding sensor. Accordingly, saving of wiring is attained.