| 摘要 |
An object of this invention is to provide a multiplex transmission system which can temporarily use an existing data area as a destination address area and an area for designating data to be transmitted when a communication node of the multiplex transmission system is started or reset, and can prevent unnecessary data other than designated data from being transmitted even when a data sendback request is issued to another communication node to which a transmission request is to be issued. In a multiplex transmission system in which a plurality of communication nodes A to E are connected via a multiplex transmission path MB, each communication node transmits a communication frame in which event data of, e.g., switch ON states of its own lamps, motors, and the like, via the multiplex transmission path MB, and the communication frame is received by all the communication nodes when a communication state is normal, when the communication node A at the transmitting side issues a data transmission request to another communication node D, the communication node A writes data representing that a frame F is a transmission request frame in an existing data area I, and the address of the communication node D which is to receive the frame F and ID(0) to ID(3) of data to be transmitted from the communication node D in data write areas D-0 to D-3, and transmits the frame.
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