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A data transmission method and voice alarm fire detector based on pulse width -based modulation

A data transmission method and technology for fire detectors, which are applied in the directions of alarms, fire alarms, transmission systems, etc., can solve the problems of inability to realize other functions, lack of I/O ports of the main control MCU, and save I/O ports. Effect

Active Publication Date: 2016-09-21
SHENZHEN FANHAI SANJIANG TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The voice alarm fire detector mainly includes the main control MCU and the voice IC. At present, the communication mode between the main control MCU and the voice IC is two-wire communication or three-line communication. Since the number of I / O ports of the main control MCU is fixed, when the voice detector is required When realizing low-voltage detection, power control, smoke detection and correct alarm, other functions cannot be realized due to the lack of I / O ports of the main control MCU.

Method used

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  • A data transmission method and voice alarm fire detector based on pulse width -based modulation
  • A data transmission method and voice alarm fire detector based on pulse width -based modulation
  • A data transmission method and voice alarm fire detector based on pulse width -based modulation

Examples

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Embodiment 1

[0027] Such as figure 1 As shown, this example provides a voice alarm fire detector, including main control MCU1, voice IC2, power supply 3, power amplifier IC4, light indicating circuit 5 and buzzer 6; wherein, main control MUC1 provides two I / O port, one I / O port is used to control the power supply 3, and the other I / O port is used to communicate with the voice IC2; the voice IC2 provides five I / O ports, which are: communication port 21, enable signal output port 22 , sound signal output port 23, light indication signal output port 24 and test signal output port 25; Communication port 21 works under the two-way mode, and when voice IC2 receives data, its work is in input mode, and when voice IC2 sends answer, its Work in output mode.

[0028] In this example, the main control MCU1 and voice IC2 of the voice alarm fire detector are connected with a single I / O line; Modulate into a one-to-one corresponding pulse unit; where, when the bit is 0, it is converted into a pulse un...

Embodiment 2

[0085] The main control MCU1 of embodiment one encodes the Hamming code check digit and the command code in the data packet into binary data, and in this example, the command code in the data packet is first generated by the main control MCU1 to generate binary command bits, and then according to The binary command bit generates a parity bit, and finally encodes the data packet into binary data. The parity bit in this example is the parity bit, specifically the even parity bit.

[0086] In this example, the even parity bit is used to encode the command code. During the communication process, the frame format of the data packet on the communication port 21 of this example is as follows: Figure 9 As shown, wherein, when there is no data communication, the communication port 21 is at low level. During communication, the main control MCU1 first outputs 1 start bit, then outputs 8 data bits, and then outputs 1 even parity bit. The data bits follow the The high bit comes first, the...

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Abstract

The invention discloses a data transmission method based on pulse width modulation and a voice alarming fire disaster detector. A master control MCU is connected with a voice IC single I / O wire. The data transmission method based on pulse width modulation comprises the following steps of data conversion, wherein the master control MCU encodes a check bit and a command code in a data package into binary data; or, the master control MCU firstly generates a binary command bit through the command code in the data package, then adds the check bit according to the binary command code, and encodes the data package into the binary data; pulse width modulation, wherein the binary data are sequentially modulated into one-to-one-correspondence pulse units according to bits, when the bit is zero, the binary data are converted into pulse units with the pulse width of T1, and when the bit is one, the binary data are converted into pulse units with the pulse width of T2; pulse signal sending, wherein the master control MCU enables the pulse units to form pulse signals with the pulse interval of T3 and sends the pulse signals to a voice IC through a single wire; data receiving, wherein the voice IC obtains the pulse signals and restores the data package according to the pulse width.

Description

technical field [0001] The application relates to a communication method in the field of fire protection, in particular to a data transmission in a voice alarm fire detector. Background technique [0002] With the rapid development of science and technology in today's society, people's living standards are also improving day by day, and their requirements for quality of life and safety are getting higher and higher. More and more natural disasters and man-made disasters endanger people's property and life safety, among which fire accounts for a very large proportion. [0003] In the fire protection industry, more and more products are used in thousands of households and various public places. These products can extinguish the fire scene through early warning and linkage control, and notify and instruct people to escape, so as to minimize casualties and property losses. Commonly used fire-fighting products include: fire-fighting fire linkage controllers, point detectors, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B14/02G08B17/00
Inventor 金鹏胡元智柴雪峰
Owner SHENZHEN FANHAI SANJIANG TECH DEV
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