Abstract: In a data recording device which records a plurality of data items of different kinds, one or plurality of nodes set the plurality of data items to data frames with frame IDs uniquely assigned for respective kinds of the data items, and transmit the data frames to a multiplex communication line. A recording unit assorts the data items contained in the data frames sent from the multiplex communication line, in accordance with the frame IDs of the data frames, and stores the assorted data items in a storage unit.

Abstract: In a vehicle communication method in which communication between a plurality of communication devices is performed and an amount of communication data sent from each communication device is changed, features are as follows. That is, if the amount of communication data sent from the first communication device is to be increased, the amount of communication data sent from the second communication device is decreased so that a total sum of the amounts of communication data sent from all the communication devices does not exceed a predetermined value.

Abstract: In a fault diagnosis data recording system including a plurality of nodes interconnected by a multiplex communication line, a first node is provided to perform fault detection of the first node, and a second node connected to the first node via the multiplex communication line is provided to have a storage unit. The first node and the second node are configured to store at least a part of result data of the fault detection performed by the first node, into the storage unit of the second node.

Abstract: In a vehicle communication method in which communication between a plurality of communication devices is performed and an amount of communication data sent from each communication device is changed, features are as follows. That is, if the amount of communication data sent from the first communication device is to be increased, the amount of communication data sent from the second communication device is decreased so that a total sum of the amounts of communication data sent from all the communication devices does not exceed a predetermined value.

Abstract: In a fault diagnosis data recording system including a plurality of nodes interconnected by a multiplex communication line, a first node is provided to perform fault detection of the first node, and a second node connected to the first node via the multiplex communication line is provided to have a storage unit. The first node and the second node are configured to store at least a part of result data of the fault detection performed by the first node, into the storage unit of the second node.

Abstract: In a data recording device which records a plurality of data items of different kinds, one or plurality of nodes set the plurality of data items to data frames with frame IDs uniquely assigned for respective kinds of the data items, and transmit the data frames to a multiplex communication line. A recording unit assorts the data items contained in the data frames sent from the multiplex communication line, in accordance with the frame IDs of the data frames, and stores the assorted data items in a storage unit.

Abstract: A system for recording, in a recording apparatus, data transmitted from a plurality of nodes provided on board a vehicle includes an in-vehicle communication line to which the nodes are connected, and a connector configured to be connected to the in-vehicle communication line and to be detachably connectable to the recording apparatus, the connector serving to link the recording apparatus to the nodes via the in-vehicle communication line.