| 摘要 |
PURPOSE:To improve the performance of the whole of a system, by turning on the power source of each terminal device tthrough a bus controlling processor of each terminal device when a CPU fises and transmitting a control program and initializing data successively from the CPU. CONSTITUTION:A CPU2 and terminal devices 3-5 are connected to a transmission bus 1 through bus conrolling processors 7 respectively. Each bus contolling processor 7 detects the state, where the transmission bus 1 is not occupied by another processor, to connect its own station to the bus 1 and detects a message destined for the processor itself to take it into its own station. When the CPU1 rises, power sources of all terminal devices 3-5 are turned on, and a control program and initializing data are transmitted to each group. The power source of the terminal device which does not receive messages over a certain time is turned off. Thus, each terminal device is initialized easily, and the occupation time of the bus is shortened, and the burden of the CPU is reduced, thus improving the performance of the whole of the system. |
