Abstract: A terminal signal operation apparatus is disclosed for transmitting in a multiplex transmission system in both directions signals between the terminal signal operation apparatus and a central operation apparatus for centrally generating control signals for controlling a plurality of electrical devices at terminals in accordance with a signal generated by a signal source.

Abstract: A central processing apparatus for use in a system which includes a plurality of remote electrical devices and a multiplex signal transmission line coupled to each of the plurality of devices.

Abstract: A control apparatus for controlling a plurality of electrical devices comprising a plurality of electrical devices, a central operation device for generating a plurality of control signals for controlling the electrical devices, the plurality of control signals comprising a first signal for driving a first electrical device and a second signal delayed in time from the first signal to permit discontinuance of the driving of the first electrical device if a high current is detected passing therethrough, a terminal operation device for each electrical device, a signal transmission line for transmitting the plurality of control signals from the central operation device to the terminal operation devices, a first terminal operation device for driving the first electrical device comprising a signal division circuit for dividing from the plurality of control signals said first and second signals, a driving circuit connected to the signal division circuit for driving the first electrical device in response to said fir

Abstract: An electrical device control system comprising: a plurality of signal sources; a plurality of electrical loads; a central operation apparatus; a plurality of terminal operation apparatus connected to the plurality of electrical loads and having means to detect the operation and a fault of the signal source and a fault of the electrical load and to generate a time division signal thereof; a multiple signal transmission line connecting the plurality of terminal operation apparatus to the central operation apparatus to transmit the time division signal to the central operation apparatus; the central operating apparatus having means to generate an activating signal for transmission over the multiple signal transmission line to the terminal station apparatus to operate an electrical load in response to the detection of the time division signal.

Abstract: State detecting apparatus comprising: first, second and third terminals, first and second potential detecting circuits each having an input and an output, a resistance, means connecting the inputs of the first and second potential detecting circuits to the first terminal, means connecting the resistance between the first terminal and a power source, means connecting the output of the first potential detecting circuit to the second terminal, means connecting the output of the second potential detecting circuit to the third terminal.

Abstract: A time division multiple transmission control apparatus which comprises a central processing device for generating a reference timing signal having a predetermined frequency and a time division multiple signal having substantially the same frequency for controlling a plurality of electrical devices during predetermined time periods, terminal processing devices for controlling each electrical device during a different predetermined time period under the control of said reference timing signal and said time division multiple signal and means for generating a phase difference between said reference timing signal and said time division multiple signal.