| 摘要 |
PURPOSE:To enable a required control signal transmitted to the terminal equipment automatically when a return signal is received from said terminal equipment, with an operation not required at the receiver side. CONSTITUTION:A linkage, between a receiver 1 and many terminal equipments 2, is made by a multicore cord 20, comprising a data signal line, synchronous signal line, etc., with an address signal and a control signal, for controlling the terminal equipment 2 of its selected address, transmitted to the terminal equipment 2 from the receiver 1 through the data signal line, simultaneously with a clock signal transmitted through the sychronous signal line to dominate a relation of synchronization in the system total unit. The above said receiver 1 comprises a transmitting circuit 3, for successively calling each of the terminal equipments 2 to transmit a control signal, a receiving circuit 4, for receiving a return signal from the terminal equipment 2 made calling, and an indicator circuit 5, for indicating a presence of reception of the return signal by its output, and the constitution is made such that, by an output of said circuit 5, a corresponding control signal is transmitted to the terminal equipment 2 with a return signal generated. |
