| 摘要 |
DERATIZATION SYSTEM WITH CONTROL OF THE REMOTE TERMINALS BY MEANS OF SIMULTANEOUSLY TRANSMITTED FREQUENCIES The novel system comprises a plurality of vibrating remote terminals controlled by a central transmitting unit. The control signals are transmitted by the central unit to the remote terminals utilizing the conventional and preexisting electrical system of the building, sending in line a modulated signal at high frequency. Depending upon the embodiment, the signal may energize directly the remote terminal or may send to the terminal a binary code capable of energizing each remote terminal according to a preestablished sequential logic. Each remote terminal sends in turn to the transmitting central unit a modulated signal in frequency capable of communicating possible conditions of partial and/or total malfunction. |
