| 摘要 |
PURPOSE:To prevent easily and effectively the multi-production of the same message by providing memory areas at a message control part in response to plural messages and storing the discriminator showing the output of a message to the memory area. CONSTITUTION:A buffer memory 22 is provided to a message control part 21 of a data processor 2. The part 21 sets the #1 bit of the memory 22 at logic 1 if a message, e.g., #1 of a main memory 1 is transmitted. The memory 22 is cleared every time point set to a timer 25. If an output request is delivered for a message of #1, this message is supplied to a terminal at one side of an AND gate circuit 24. While the logic 0 obtained by inverting the logic 1 by an inverting circuit 23 is supplied to the other terminal of the circuit 24. Then the circuit 24 becomes nonconductive. In other words, the message of #1 is not delivered and therefore the retransmission is impossible for a prescribed period of time. As a result, the multi-production of the same message can be prevented easily and effectively. |
