Talkback device and interlayer device and system for building paging

Abstract

The invention discloses a talkback device and an interlayer device and system for building paging. The talkback device comprises a command signal generating unit, a data drive output unit and an extension set picking and hanging up detection unit, wherein the command signal generating unit is used for generating a plurality of square signals with different periods; the data drive output unit is connected with the command signal generating unit and is used for sending the square signals; and the extension set picking and hanging up detection unit is respectively connected with the command signal generating unit and the data drive output unit and is used for detecting the working state of the talkback device and controlling the on-off of the data drive output unit according to the current working state. According to the invention, a CPU (central processing unit) component is not needed, the device cost is reduced, the corresponding software cost is reduced, the development difficulty is reduced, and the maintenance cost after sale is reduced as far as possible.

Description

technical field [0001] The invention relates to building security technology, in particular to an intercom device, interlayer equipment and system for building paging. Background technique [0002] In the building intercom system industry, the data command communication between the inter-floor equipment and the home extension equipment generally adopts the following two methods. One is that the home extension equipment uses MCU single-chip microcomputer, data transceiver drive interface circuit and data commands. The combination of communication and communication protocols enables the exchange of data commands with the inter-layer equipment, thereby realizing the basic functions of on-hook, on-hook, unlocking, monitoring, calling the management office, and alarm functions of the home extension equipment; the other way is in The home extension equipment adopts the voltage division method to transmit different level values ​​to the interlayer equipment to represent different d...

AI Technical Summary

Problems solved by technology

[0003] Among them, the first method is flexible in application, easy to modify the function definition, and has strong function scalability, but the circuit cost and development cost are relatively high due to the complexity of the implementation method, so it is not suitable for low-cost intercom system design; Although the second method is simple to implement and low in cost, it will cause problems of poor reliability because it relies on distinguishing signal level values ​​and the ground levels are unequal due to long-distance wiring, especially on one line. More error-prone when expressing multiple different functional instructions

It can be solved by using multiple wires, but it will bring troubles in engineering construction and increase costs for wiring problems

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