JPS59142888U - analog alarm device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an example of a conventional device, FIG. 2 is a circuit block diagram showing an embodiment of the present invention, and FIG. 3 is an example of a frame pulse train sent out from the receiver of the present invention. FIG. 4 is a signal waveform diagram showing logic levels in the frame pulse train of FIG. 3, FIG. 5 is a signal waveform diagram showing data returned from the terminal device in the embodiment of FIG. 2, and FIG. The figure is a circuit block diagram showing another embodiment of the present invention, and FIG. 7 is a signal waveform diagram for data return in the embodiment of FIG. 6. 6: Analog sensor, 10: Receiver, 11.12: Power signal line, 13: Terminal device, 14: Constant voltage port. 15: terminal control circuit, 16: transistor.

Claims (1)

[Claims for Utility Model Registration] A plurality of terminal devices are connected in parallel to a pair of power supply signal lines □ led out from the receiver, and each of the terminal devices has a device that detects and detects changes in the surrounding physical development. An analog alarm device in which an analog sensor that outputs an analog detection signal according to a change is connected, and each of the terminal devices converts the detection signal of the analog sensor into a digital signal and sends it back to the receiver in response to a call from the receiver. The receiver is equipped with a synchronization pulse generating means for outputting a synchronization pulse of a constant period giving a return timing of digital data following an address signal for calling the terminal device, An analog alarm device comprising data sending means for sequentially sending code pits of digital data to a receiver in current or voltage mode using pulse idle time.