| 摘要 |
The data communication system according to the present invention executes data transmissions and data receptions between a main unit and a plurality of terminals by the polling/selecting method. The main unit comprises a key input section and a memory that stores information on communication periods of each terminal, which were set by using the key input section. In a case where polling/selecting is performed, the communication periods of the designated terminal are read. The main unit further comprises a timer. The present time which is read from the timer is compared with the designated communication periods which are read from the memory and whether or not the present time is within the communication periods is determined. In the case where the time is within the communication periods, the main unit executes the polling/selecting processing to the terminal and the data communication is performed. On the other hand, in the case where the time is out of the designated communication periods, the main unit does not perform any processing to the terminal. The above-described processes are sequentially executed to each of the plurality of terminals.
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