| 摘要 |
PURPOSE:To improve the efficiency of up stream radio channels by allocating the number of slave stations using the up stream radio channels so as to be equal to the up stream radio channels in number when the plural up stream radio channels are assigned to the slave stations through which the slave stations respond to the master station upon receiving multi-address communication. CONSTITUTION:Plural radio channels CH1-CH3 shared by plural slave stations 2 are assigned for returning a response to the multi-address communication by the slave stations 2, and the slave stations 2 which return the response are allocated so as to be equal to the radio channels CH1-CH3 in number. Then, a master station 1 transmits a control signal in the multi-address communication, and the control signal designates the radio channels to be used by the slave stations 2 for the response and the transmitting timing, and the slave stations 2 which return the response are allocated so as to be equal to the radio channels CH1-CH3 in number. The slave stations 2 identify the control signal from among the multi-communication, and return the response through the designated radio channels and in the designated timing under the control of a control circuit. |
