| 摘要 |
PURPOSE:To facilitate the priority control by applying status report from a data communication circuit to a central processing unit individually according to the priority while status words are stored separately according to the priority. CONSTITUTION:Plural levels are set according to the priority of reception processing and a status word table by each level is provided to a common memory 12, each data communication circuit divides the status by levels according to the priority of reception processing, writes it on a table, and a central control unit 13 reads the data from the table while recognizing the leveling. One status word table is not prepared for each data communication circuits 11a-11k but plural levels are set according to the processing priority, plural tables are provided corresponding to the plural levels as to the same data communication circuit so as to store the status (status word) according to the priority onto the corresponding table thereby facilitating the priority control.
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