| 摘要 |
<p>PROBLEM TO BE SOLVED: To decrease the frequency of issue of a control instruction to devices, to reduce the load, and to improve the performance, by setting a control instruction that the devices receive as their addresses to addresses which are one incremented and issuing them. SOLUTION: The power source control unit 1 when issuing power source control instructions to all devices, issues them ton only a device #1 connected to a port 1 and a device #5 connected a port 2. The device #1 of the port 1 recognizes that the issues power source control instruction is addressed to itself and processes it, increments its own address by one and sets the address of an adjacent device #2, and issues a power source control instruction. Similarly, the device #2 recognize that the power source control instruction whose address is issued by the device #1 is addressed to itself, performs a process similar to that of the device #1, and issues a power source control instruction to a device 3. Thus, the respective devices performs the same operation to issue the instructions issued by the power source control unit 1 to the devices #1 to #4 in order.</p> |
