| 摘要 |
<p>PURPOSE:To improve the efficiency of data transmission by letting a high order data transmitter perform communication only with a low order data transmitter while being energized in a radio data communication system constituted of one high order data transmitter and the plural low order data transmitters. CONSTITUTION:Between the high order data transmitter and the respective low order data transmitters, the high order data transmitter discriminates the number and the kind of the low order data transmitters participating in the data transmission by the transmission/reception of respective recognition codes. Also, by the transmission/reception of respective data lengths per packet in the high order and low order data transmitters, the low order data transmitters perform the data transmission based on the informed data length per packet and further, when the data length per packet is changed, the low order data transmitter informs the high order data transmitter of the data length to be changed. Similarly, communication operation conditions such as a carrier frequency, transmission power and a priority degree, etc., are turned to messages for status display and mutually informed.</p> |
