| 摘要 |
When a parent device of a wireless transmission system receives a transmission request, then in S1, the parent device generates a data packet to be transmitted to the child device. In S2, the parent device confirms whether or not the parent device is presently receiving data. In S3, the parent device transmits the data packet to the child device. When the parent device receives no response packet (S4:NO), then after waiting for a retry waiting time to elapse (S5), the parent device retransmits the data packet in S6. A retry waiting time of the parent device is set longer than a retry waiting time of the child device by an amount equivalent to the time width of the data packet itself and twice a delay time generated during wireless transmission. Therefore, the child device retransmits its data packet with priority over the parent device. With this configuration, data can be stably transmitted and received even after data collides.
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