JPS5778238A - Roll call device - Google Patents

Abstract

PURPOSE:To call the roll of slave radio equipments easily and accurately, by transmitting a call signal to slave radio equipments from a master radio equipment by making a switch in the master radio equipment from the external and transmitting response signals from slave radio equipments for receiving of this call signal and receiving and displaying these response signals in the master radio equipment. CONSTITUTION:A master radio equipment 1 has a transmitting circuit 3, a receiving circuit 4, and a display device 5; and when a roll call command is given by making a switch 6 by the operation from the external, power is fed from a battery 7 to operate the transmitting circuit 3. Then, different call signals A are transmitted successively to respective slave radio equipments 2 from an tranmission antenna 8. Simultaneously, the receiving circuit 4 is operated and different response signals B from respective slave radio equipments 2 are received through a receiving antenna 9, and display signals (d) corresponding to signals B are outputted. The display device 5 receives signals (d) to emit the light and displays the transmission of response signals B of respective slave radio equipments.