| 摘要 |
PURPOSE:To realize a common utilization of a central processor by plural slave stations, by a simple means, by sending to each slave station from the central processor a command indicating that its processor can be used. CONSTITUTION:To a control processor 50, plural terminals (slave stations) are connected in a multidrop form. In a memory 61 in the central processor 50, a memory area consisting of a timer area M1 and an area M2 for controlling each terminal equipment, etc. is provided so that one terminal does not occupy the central processor exceeding a prescribed time (for intance, 30min). In this way, a CPU60 in the central processor sends out to each terminal the information that the central processor is idle, through a series-parallel converter 63, and when a processing request is received from one specified terminal, the information that the processing is impossible is sent out to other terminals than said terminal. |
