CN111431562B - Fire-fighting information transmission system, method and device - Google Patents

Fire-fighting information transmission system, method and device Download PDF

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Publication number
CN111431562B
CN111431562B CN202010148441.1A CN202010148441A CN111431562B CN 111431562 B CN111431562 B CN 111431562B CN 202010148441 A CN202010148441 A CN 202010148441A CN 111431562 B CN111431562 B CN 111431562B
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China
Prior art keywords
information
node
slave node
control information
slave
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CN202010148441.1A
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Chinese (zh)
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CN111431562A (en
Inventor
朱旭振
马金明
田辉
刘国泰
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Xuchang Beiyou Wanlian Network Technology Co ltd
Beijing University of Posts and Telecommunications
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Xuchang Beiyou Wanlian Network Technology Co ltd
Beijing University of Posts and Telecommunications
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Priority to CN202010148441.1A priority Critical patent/CN111431562B/en
Publication of CN111431562A publication Critical patent/CN111431562A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/54—Systems for transmission via power distribution lines
    • H04B3/542—Systems for transmission via power distribution lines the information being in digital form
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
    • G08B25/01—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
    • G08B25/06—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium using power transmission lines
    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C19/00—Electric signal transmission systems
    • G08C19/02—Electric signal transmission systems in which the signal transmitted is magnitude of current or voltage
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0264—Arrangements for coupling to transmission lines
    • H04L25/0272—Arrangements for coupling to multiple lines, e.g. for differential transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2203/00—Indexing scheme relating to line transmission systems
    • H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
    • H04B2203/5429—Applications for powerline communications
    • H04B2203/5441—Wireless systems or telephone
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2203/00—Indexing scheme relating to line transmission systems
    • H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
    • H04B2203/5429—Applications for powerline communications
    • H04B2203/5458—Monitor sensor; Alarm systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]

Abstract

In the embodiment of the application, the fire-fighting information transmission system comprises a wireless local area network; a main node and a plurality of slave nodes exist in the wireless local area network; the master node and the slave node establish communication connection through a shielded differential twisted pair; the slave node is used for detecting whether an event to be alarmed exists at the position of the slave node, generating and sending alarm state information for prompting whether the event to be alarmed exists to the master node; the master node is used for determining the identification information of the slave node with the event to be alarmed according to the received alarm state information; generating audio information and control information; the audio information and the control information are transmitted to the slave node in a superposition mode through a frequency division multiplexing transmission mode and a differential current transmission mode; the slave node is also used for receiving audio information and control information; and when the identification information carried in the control information is matched with the identification information of the slave node, playing corresponding alarm audio. This reduces the number of transmission lines required in the system and improves the immunity and reliability of the system to interference.

Description

Fire-fighting information transmission system, method and device
Technical Field
The application relates to the technical field of communication, in particular to a fire-fighting information transmission system, method and device.
Background
In the prior art, information transmission is required between a master node and a slave node in a fire-fighting information transmission system. Specifically, the master node is used as a master control end in a local area network in the system, and can judge whether the slave node needs to alarm or not according to the received alarm state information sent by the slave node. Then, the master node sends control information and audio information to the slave nodes, wherein the control information carries identification information of the slave nodes needing to be alarmed; the slave node is used as a slave end in a local area network in the system, can acquire alarm state information of the environment where the slave node is positioned, and sends the alarm state information to the master node; the slave node also needs to complete receiving the control information and the audio information sent by the master node; and when the identification information carried in the control information is matched with the identification information of the slave node, playing the alarm audio corresponding to the audio information to alarm.
However, since various information such as alarm state information, control information, audio information, etc. needs to be transmitted between the master node and the slave node, and each transmitted information needs two or more transmission lines for transmission, a plurality of groups of transmission lines exist between the master node and the slave node. Interference among multiple groups of transmission lines is easy to occur, so that the probability of interference on information transmission is increased, the anti-interference capability of the fire-fighting information transmission system is poor, and the reliability is reduced.
Disclosure of Invention
An object of the embodiments of the present application is to provide a fire protection information transmission system, method and apparatus, so as to reduce the number of transmission lines between a master node and a slave node, thereby improving the anti-interference capability and reliability of the system.
The specific technical scheme is as follows:
in a first aspect, a fire fighting information transmission system is provided, the system comprising a wireless local area network; a main node and a plurality of slave nodes exist in the wireless local area network; the master node and the slave node establish communication connection through a shielded differential twisted pair;
the slave node is used for: detecting whether an event to be alarmed exists at the position of the slave node, and generating alarm state information for prompting whether the event to be alarmed exists; sending alarm state information to a main node;
the master node is configured to: according to the received alarm state information, determining the identification information of the slave node with the event to be alarmed; generating audio information and control information; wherein, the control information carries identification information; the audio information and the control information are transmitted to the slave node in a superposition mode through a frequency division multiplexing transmission mode and a differential current transmission mode;
the slave node is further configured to: receiving audio information and control information; and when the identification information carried in the control information is matched with the identification information of the slave node, playing the alarm audio corresponding to the audio information according to the indication of the control information.
Optionally, the slave node is further configured to: and after the alarm audio corresponding to the audio information is played, sending the position information of the slave node to the master node as the position information of the event to be alarmed.
Optionally, the fire-fighting information transmission system further comprises a remote monitoring center; the remote monitoring center and the wireless local area network establish communication connection in a wireless transmission mode;
the master node is further configured to: receiving position information of an event to be alarmed sent from a node; the position information is sent to a remote monitoring center in a wireless transmission mode;
the remote monitoring center is used for: and prompting the position of the position information to generate an alarm event.
Optionally, the remote monitoring center is further configured to: and sending an upgrading instruction to the wireless local area network, wherein the upgrading instruction is used for indicating the master node and the slave node in the wireless local area network to carry out program upgrading.
Optionally, the master node is further configured to: after the audio information and the control information are generated, increasing the voltage value of the audio information to a first preset voltage value;
the slave node is further configured to: after receiving the audio information and the control information, converting the audio information into a signal satisfying a preset frequency and a second preset voltage value as a power supply signal of the slave node; the second preset voltage value is smaller than the first preset voltage value.
Optionally, the master node is further configured to: sending a preset number of training signaling to the slave node before the audio information and the control information are transmitted to the slave node in a superposition manner; wherein, the training signaling is used for determining a threshold value for decoding the training signaling;
the slave node is further configured to: after receiving the training signaling sent by the main node, decoding the training signaling;
after receiving the audio information and the control information, determining a threshold value when the training signaling is decoded as a threshold value of the decoding control information;
decoding the control information according to the threshold value to obtain the decoded control information; wherein the decoded control information includes identification information.
The second aspect provides a fire-fighting information transmission method applied to a master node in a fire-fighting information transmission system, wherein the master node is a master node in a wireless local area network in the fire-fighting information transmission system, a plurality of slave nodes are also arranged in the wireless local area network, and the master node and the slave nodes are in communication connection through a shielded differential twisted pair; the method comprises the following steps:
receiving alarm state information sent from a node; the alarm state information is used for prompting whether an event to be alarmed exists at the position of the slave node;
according to the alarm state information, determining the identification information of the slave node with the event to be alarmed;
generating audio information and control information; wherein, the control information carries identification information;
and transmitting the control information and the audio information to the slave node in a superposition manner by a frequency division multiplexing transmission manner and a differential current transmission manner.
Optionally, the fire-fighting information transmission system further includes a remote monitoring center; the remote monitoring center and the wireless local area network establish communication connection in a wireless transmission mode; the fire fighting information transmission method further comprises:
and after receiving the position information of the event to be alarmed sent by the slave node, sending the position information to a remote monitoring center in a wireless transmission mode.
Optionally, the fire fighting information transmission method further includes: receiving an upgrading instruction sent by a remote control center; and upgrading the program according to the instruction of the upgrading instruction.
In a third aspect, a fire-fighting information transmission device applied to a master node in a fire-fighting information transmission system is provided, wherein the master node is a master node in a wireless local area network in the fire-fighting information transmission system, a plurality of slave nodes are also present in the wireless local area network, and the master node and the slave nodes establish communication connection through a shielded differential twisted pair; the device includes:
the receiving module is used for receiving the alarm state information sent by the slave node; the alarm state information is used for prompting whether an event to be alarmed exists at the position of the slave node;
the determining module is used for determining the identification information of the slave node with the event to be alarmed according to the alarm state information;
the generating module is used for generating audio information and control information; wherein, the control information carries identification information;
and the sending module is used for transmitting the control information and the audio information to the slave node in a superposition manner through a frequency division multiplexing transmission mode and a differential current transmission mode.
In a fourth aspect, an electronic device is provided, which includes a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory complete communication with each other through the communication bus;
a memory for storing a computer program;
and the processor is used for realizing any method step in the fire fighting information transmission method embodiment when executing the program stored in the memory.
In a fourth aspect, a computer-readable storage medium is provided, in which a computer program is stored, which, when being executed by a processor, implements any one of the method steps in the above-mentioned fire fighting information transmission method embodiment.
In a fifth aspect, a computer program product containing instructions is provided, which when run on a computer causes the computer to perform any of the method steps of the above-described fire fighting information transmission method embodiments.
The embodiment of the application provides a fire-fighting information transmission system, a fire-fighting information transmission method and a fire-fighting information transmission device, wherein the system comprises a wireless local area network, and a main node and a plurality of slave nodes exist in the wireless local area network; and the master node and the slave node establish communication connection through a shielded differential twisted pair. The slave node is used for: detecting whether an event to be alarmed exists at the position of the slave node, and generating alarm state information for prompting whether the event to be alarmed exists; sending alarm state information to a main node; the master node is configured to: according to the received alarm state information, determining the identification information of the slave node with the event to be alarmed; generating audio information and control information; wherein, the control information carries identification information; the audio information and the control information are transmitted to the slave node in a superposition mode through a frequency division multiplexing transmission mode and a differential current transmission mode; the slave node is further configured to: receiving control information and audio information; and when the identification information carried in the control information is matched with the identification information of the slave node, playing the alarm audio corresponding to the audio information according to the indication of the control information. In the fire-fighting information transmission system, the main node transmits superposed control information and audio information to the slave node on the shielded differential twisted pair wire in a frequency division multiplexing transmission mode and a differential current transmission mode. Therefore, the number of transmission lines needed in the fire-fighting information transmission system is reduced, the anti-interference capacity of the system is improved, and the reliability of the fire-fighting information transmission system is improved.
Of course, not all advantages described above need to be achieved at the same time in the practice of any one product or method of the present application.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of a fire fighting information transmission system according to an embodiment of the present application;
fig. 2 is a schematic diagram of a signal waveform in an information transmission process according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a transmitting circuit according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a receiving circuit from a node according to an embodiment of the present disclosure;
fig. 5 is a flowchart of a control information transmission method according to an embodiment of the present application;
fig. 6 is a flowchart of an audio information transmission method according to an embodiment of the present application;
fig. 7 is a schematic diagram of an internal circuit structure of a wlan according to an embodiment of the present disclosure;
FIG. 8 is a schematic diagram of another fire information delivery system according to an embodiment of the present disclosure;
fig. 9 is a flowchart of a fire fighting information transmission method applied to a slave node according to an embodiment of the present application;
FIG. 10 shows an embodiment of the present application
The embodiment provides a flow chart of a fire-fighting information transmission method applied to a main node;
fig. 11 is a schematic structural diagram of a fire fighting information transmission device applied to a master node according to an embodiment of the present application;
fig. 12 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
A fire fighting information transmission system provided by the embodiment of the present application will be described in detail with reference to specific embodiments, where the system includes a wireless local area network; a main node and a plurality of slave nodes exist in the wireless local area network; as shown in fig. 1, which is a possible application scenario, the communication connection between the master node and the slave node is established through a shielded differential twisted pair, and a wireless local area network in the fire fighting information transmission system includes: master node, slave node 1, slave node 2 and slave node 3; the master node establishes communication connections with the slave node 2, the slave node 2 and the slave node 3 through shielded differential twisted pair lines.
In an embodiment of the present application, a slave node is configured to: detecting whether an event to be alarmed exists at the position of the slave node, and generating alarm state information for prompting whether the event to be alarmed exists; sending alarm state information to a main node;
the master node is configured to: according to the received alarm state information, determining the identification information of the slave node with the event to be alarmed; generating audio information and control information; wherein, the control information carries identification information; the audio information and the control information are transmitted to the slave node in a superposition mode through a frequency division multiplexing transmission mode and a differential current transmission mode;
for example, fig. 2 is a schematic diagram of a signal waveform in an information transmission process according to an embodiment of the present application. As shown in the figure, a waveform 1 in the left diagram in the figure is a waveform diagram of audio information to be transmitted with a frequency of 1KHz and a voltage of 110V, and a waveform 2 in the left diagram in the figure is a waveform diagram of control information to be transmitted with a frequency of 307.2 KHz. The waveform diagram on the right side in the figure is a waveform diagram of a differential signal in which audio information and control information are superimposed.
The slave node is used for: receiving audio information and control information; and when the identification information carried in the control information is matched with the identification information of the slave node, playing the alarm audio corresponding to the audio information according to the indication of the control information.
The embodiment of the application provides a fire-fighting information transmission system, a fire-fighting information transmission method and a fire-fighting information transmission device, wherein the system comprises a wireless local area network, and a main node and a plurality of slave nodes exist in the wireless local area network; and the master node and the slave node establish communication connection through a shielded differential twisted pair. The slave node is used for: detecting whether an event to be alarmed exists at the position of the slave node, and generating alarm state information for prompting whether the event to be alarmed exists; sending alarm state information to a main node; the master node is configured to: according to the received alarm state information, determining the identification information of the slave node with the event to be alarmed; generating audio information and control information; wherein, the control information carries identification information; the audio information and the control information are transmitted to the slave node in a superposition mode through a frequency division multiplexing transmission mode and a differential current transmission mode; the slave node is further configured to: receiving control information and audio information; and when the identification information carried in the control information is matched with the identification information of the slave node, playing the alarm audio corresponding to the audio information according to the indication of the control information. In the fire-fighting information transmission system, the main node transmits superposed control information and audio information to the slave node on the shielded differential twisted pair wire in a frequency division multiplexing transmission mode and a differential current transmission mode. Therefore, the number of transmission lines needed in the fire-fighting information transmission system is reduced, the anti-interference capacity of the system is improved, and the reliability of the fire-fighting information transmission system is improved.
For example, the master node may specifically transmit control information by using binary On-off Keying (OOK), and the modulated carrier may be a 307.2KHz frequency signal generated by a monostable trigger. When the control information to be sent is 1, the main node outputs a high level with 32 carrier periods in a 1-bit signal; when the control information to be transmitted is 0, the master node outputs a low level of 32 carrier cycles in a signal of 0 bit. The frequency band for transmitting the audio information by the main node is 300-3400 Hz; specifically, the audio signal is first amplified in power by a bridge class d power amplifier, and then converted to 110V by a transformer. The audio signal with the effective value of 110V and the control signal with the carrier frequency of 307.2KHz are superposed and transmitted to the slave node in a frequency division multiplexing and differential current mode. The communication protocol between the master node and the slave node satisfies three-way handshake, and a recommended Standard-485 protocol (RS-485 protocol), a High-level Data Link Control (HDLC) protocol, and a recommended Standard-422 protocol (RS-422 protocol) may be used specifically. And the reliability of the fire-fighting information transmission system is enhanced by using a communication protocol requiring three-way handshaking. Taking communication between a master node and a slave node according to an RS-485 protocol as an example, the specific communication protocol is defined as follows: the format of the master node sending commands is shown in table 1:
initiation of Address bit Copyright secret password Data bit Hamming verification Frame end
1bit 8bit 6bit 3bit 4bit 1bit
TABLE 1
The format of the command sent from the node is shown in table 2:
initiation of Address bit Copyright secret password Data bit Hamming verification Frame end
1bit 8bit 6bit 3bit 4bit 1bit
TABLE 2
In addition, as an embodiment, the slave node in the preset range of the event to be alarmed can be used as a nearby slave node to be alarmed, and the nearby slave node to be alarmed can send out alarm audios with different volumes according to the received indication of the control information, wherein the volume of the alarm audio of the nearby slave node to be alarmed closer to the event to be alarmed is larger, and the volume of the alarm audio of the slave node with the event to be alarmed is the largest. Therefore, the user can determine the position of the event to be alarmed according to the volume of the alarm audio, and make corresponding protective measures.
Specifically, fig. 3 is a schematic structural diagram of a transmitting circuit according to an embodiment of the present disclosure. The Ultra Wide Band (UWB) positioning circuit comprises an Ultra Wide Band (UWB) positioning module, a power supply, a single chip microcomputer, a USB (universal serial bus) conversion serial port, a PWM (pulse-width modulation) modulation circuit, a negative feedback operational amplifier circuit, an audio power amplifier, a transformer, a monostable trigger, a shielded transmission line (or a shielded differential twisted pair) and an RS-485 interface chip. Specifically, a monostable trigger generates a 307.2KHz periodic oscillation signal as carrier signals of both communication parties, and the carrier signals are used for OOK modulation on information to be transmitted, wherein the carrier signals comprise control information sent by a master node and alarm state information sent by a slave node; and then the control information and the alarm state information after OOK modulation can be transmitted in the form of differential current signals through an RS-485 chip. Then, the 1KHz audio signal is PWM modulated by a PWM control chip with adjustable duty ratio, converted into a signal with 110V amplitude and 1KHz frequency by a negative feedback operational amplifier circuit and an audio power amplifier, transmitted to a transformer, and transmitted to a corresponding receiving circuit by a shielding differential transmission line. In a sending circuit of the master node, a transformer superposes the modulated control information and the amplified audio information and sends the superposed control information and the amplified audio information to the slave node through a differential transmission line; in a transmitting circuit of the slave node, the transformer transmits the modulated alarm state information to the master node through the differential transmission line.
Fig. 4 is a schematic structural diagram of a receiving circuit from a node according to an embodiment of the present disclosure. The figure includes: the device comprises a UWB positioning module, a monostable trigger, a single chip microcomputer, a USB transfer serial port, a threshold-adjustable hysteresis comparator, an audio amplifier, a relay, a PWM (pulse-width modulation) circuit, a transformer 1, a second-order filter circuit, a transformer 2, an RS-485 chip, a differential transmission line and a power supply conversion circuit. Specifically, after the slave node receives the superposed control information and audio information from the differential transmission line, the superposed control information and audio information are converted and sent to the second-order filter circuit through the RS-485 chip, the audio signal with low frequency is filtered by the first-order filter, the audio signal is sent to the PWM modulation circuit for demodulation, the low-frequency signal left after the second-order high-pass filter, and the remaining high-frequency signal is the control information, so that the audio information and the control information are separated. The audio information demodulated by the PWM modulation circuit is converted into a 3.3V power supply signal through the transformer 2 so as to supply power to the slave node; the high-pass signal after the second-order high-pass filtering is converted into a pulse signal through the transformer 1 and the hysteresis comparator, so that the indication corresponding to the control information is determined. When the indication corresponding to the control information is to play audio, the single chip microcomputer opens the relay, and the alarm audio received from the transformer 2 is played through the audio amplifier.
In terms of the overall communication process, as shown in fig. 5, which is a flowchart of a method for transmitting control information provided in the embodiment of the present application, as shown in fig. 5, a single chip microcomputer in a master node generates power supply information; a monostable oscillating circuit generates a carrier signal carrying control information, and then the OOK modulated control information is subjected to RS-485 and audio aliasing to obtain superimposed power supply information and control information which can be transmitted; and the slave node sends the control information demodulated by the OOK to a single chip microcomputer in the slave node through high-pass filtering, transformer isolation and a comparator. As shown in fig. 6, for a flowchart of a method for transmitting audio information provided in the embodiment of the present application, as shown in fig. 6, a single chip of a master node converts audio information of a digital signal into audio information of an analog signal, and the audio information is amplified by gain amplification, an audio power amplifier, and a negative feedback operational amplifier circuit; the audio oscillation circuit generates a carrier signal for modulation; the audio signal is then boosted to a 110V voltage signal by a transformer and superimposed with a 307.2KHz carrier signal. And transmitting to the slave node through the differential transmission line. And the slave node performs attenuation and transformation on the received superposed audio information. And when the indication corresponding to the control information indicates that the slave node plays the audio, the slave node controls the relay to open the loudspeaker to play the alarm audio.
Further, the slave node is further configured to: and after the alarm audio corresponding to the audio information is played, sending the position information of the slave node to the master node as the position information of the event to be alarmed.
In the embodiment of the present application, the slave node may determine the specific location of the slave node by using an Ultra Wide Band (UWB) technology. Fig. 7 is a schematic diagram of an internal circuit structure of a wlan according to an embodiment of the present disclosure. As shown in fig. 7, there are a master node and n slave nodes in the wireless local area network; the main node is internally provided with a UWB wireless positioning module and a carrier and audio transmitting circuit module; a carrier and audio receiving circuit module and a UWB wireless positioning module are arranged from the node 1 to the slave node n. The position of the slave node with the event to be alarmed is used as the position of the event to be alarmed, so that the position of the event to be alarmed is accurately positioned, and the practicability of the system is improved.
Optionally, the system further comprises a remote monitoring center; the remote monitoring center and the wireless local area network establish communication connection in a wireless transmission mode;
the master node is further configured to: receiving position information of an event to be alarmed sent from a node; the position information is sent to a remote monitoring center in a wireless transmission mode;
the remote monitoring center is used for: and prompting the position of the position information to generate an alarm event.
The remote monitoring center and the wireless local area network can establish communication connection through wireless communication technologies such as a Long Range Radio (LoRa) gateway and a narrowband Internet of Things (NB-IoT). Therefore, the wiring cost of the fire-fighting information transmission system and the power consumption consumed in the information transmission process are reduced. Specifically, as shown in fig. 8, a schematic diagram of another fire fighting information transmission system provided in the embodiment of the present application is shown. As shown in fig. 8, the wireless lan 1 has a master node and n slave nodes; a master node and n slave nodes exist in the wireless local area network 2; the master node and the slave node in the same wireless local area network are in communication connection through a shielded differential twisted pair. The wireless local area network establishes wireless communication connection with a remote monitoring center through a network coordinator and a Lora gateway. Specifically, the network coordinator and the Lora gateway serve as a central hub for wireless information transmission between the remote monitoring center and the wireless local area network, and can transmit information to the remote monitoring center in a wireless manner and receive a remote control instruction of the remote monitoring center for the local area network.
In the embodiment of the application, the slave node having the event to be alarmed may send the position information of the position of the slave node to the master node, and the master node sends the position information to the remote monitoring center, specifically to a mobile phone terminal, a Personal Computer (PC) terminal, and the like of the user. Then, the user can determine the specific position of the event to be alarmed according to the information displayed by the remote monitoring center, and perform corresponding protection.
Optionally, the remote monitoring center is further configured to: and sending an upgrading instruction to the wireless local area network, wherein the upgrading instruction is used for indicating the master node and the slave node in the wireless local area network to carry out program upgrading.
The program upgrading of the fire-fighting information transmission system in the prior art is realized in an off-line mode of a master node and a slave node, and the upgrading mode consumes large manpower and material resources and is not beneficial to the real-time upgrading and upgrading of products.
In the embodiment of the application, the remote monitoring center can perform wireless remote upgrade on the programs of the master node and the slave node in the wireless local area network through the network coordinator and the Lora gateway. Therefore, manpower and material resources required by the fire fighting information system are reduced, and the program updating of the master node and the slave node is conveniently carried out in time.
Optionally, the master node is further configured to: after the audio information and the control information are generated, increasing the voltage value of the audio information to a first preset voltage value;
the slave node is further configured to: after receiving the audio information and the control information, converting the audio information into a signal satisfying a preset frequency and a second preset voltage value as a power supply signal of the slave node; the second preset voltage value is smaller than the first preset voltage value.
Specifically, the master node can increase the voltage for transmitting the audio information to 110V through the transformer for transmission, so that the anti-interference performance during the audio information transmission through the voltage is improved. In addition, after the slave node receives the audio information, the audio signal with the first-order filtered and attenuated amplitude can be subjected to bridge rectification by using a differential signal, and then the audio signal passes through a PWM control chip and a transformer to generate a 3.3V power supply voltage to supply power to the slave node. Since the first preset voltage value is higher than the second preset voltage value, the slave node is ensured to obtain enough energy from the audio information, and the power supply of the slave node is realized. Furthermore, the slave node can directly obtain the power supply signal from the received signal sent by the master node, and the complexity of power supply wiring of the slave node is reduced.
Optionally, the master node is further configured to: sending a preset number of training signaling to the slave node before the audio information and the control information are transmitted to the slave node in a superposition manner; wherein, the training signaling is used for determining a threshold value for decoding the training signaling;
the slave node is further configured to: after receiving the training signaling sent by the main node, decoding the training signaling;
after receiving the audio information and the control information, determining a threshold value when the training signaling is decoded as a threshold value of the decoding control information;
decoding the control information according to the threshold value to obtain the decoded control information; wherein the decoded control information includes identification information.
Fig. 9 is a flowchart of a fire fighting information transmission method applied to a slave node according to an embodiment of the present application. As shown, the slave node may perform the following steps:
step S901: receiving and decoding a training signaling sent by a main node; wherein, the training signaling is used for determining a threshold value for decoding the training signaling;
step S902: determining a threshold value when the training signaling is decoded as a threshold value of decoding control information;
step S903: monitoring alarm state information of the position; the alarm state information is used for prompting whether an event to be alarmed exists at the position of the slave node;
step S904: after receiving polling information sent by a main node, sending alarm state information; the polling information is used for inquiring the alarm state information of the position of the slave node;
step S905: decoding the control information according to the threshold value to obtain the decoded control information;
step S906: judging whether the identification information in the decoded control information is matched with the identification information of the slave node; if yes, go to step S907; if not, go to step S903;
step S907: and playing the alarm audio corresponding to the audio information according to the indication of the decoded control information.
And a Hamming code coding mode can be adopted when the information of the master node and the slave node is transmitted. Specifically, when the master node transmits the control information, the master node firstly performs coding transformation on the control information and then performs OOK modulation transmission; when the slave node sends the alarm state information, the alarm state information is firstly coded and then OOK modulation sending is carried out. When receiving information, the master node and the slave node decode the information according to the corresponding coding mode, and when an error occurs in communication, the error in the communication process can be corrected according to the characteristics of the coded signal. Therefore, communication can be simply and conveniently carried out, encryption transmission can be realized, and the anti-interference capability is improved.
In the embodiment of the application, the slave node can convert the received audio information and control information sent by the master node into direct current signals through high-pass filtering and a bridge rectifier circuit, and then converts the control information into pulse signals through a transformer and a hysteresis comparator. While decoding the training signaling, the slave node may adjust the threshold value of the threshold adaptively adjustable comparator to the threshold value indicated by the training signaling. And then decoding the control information according to the adjusted threshold value, and determining a control command corresponding to the control information. Therefore, when information occurs, the master node and the slave node carry out coding according to the corresponding coding rule, and when the information is received, the information is decoded according to the corresponding coding mode. When an error occurs in communication, the error in the communication process can be corrected according to the characteristics of the encoded signal. Therefore, carrier communication can be simply and conveniently carried out, transmission can be encrypted, and the anti-interference capability is improved. In addition, the threshold value of the slave node in decoding can be modified in real time, and the anti-interference capability is improved.
Based on the same conception, the embodiment of the application also provides a fire-fighting information transmission method, which is applied to the main node in the fire-fighting information transmission system, wherein the main node is the main node in the wireless local area network in the fire-fighting information transmission system, a plurality of slave nodes are also arranged in the wireless local area network, and the main node and the slave nodes are in communication connection through a shielded differential twisted pair; as shown in fig. 10, the method includes:
step 1001: receiving alarm state information sent from a node; the alarm state information is used for prompting whether an event to be alarmed exists at the position of the slave node.
Step 1002: and determining the identification information of the slave node with the event to be alarmed according to the alarm state information.
Step 1003: generating audio information and control information; the control information carries identification information.
Step 1004: and transmitting the control information and the audio information to the slave node in a superposition manner by a frequency division multiplexing transmission manner and a differential current transmission manner.
In the embodiment of the application, the system comprises a wireless local area network, wherein a main node and a plurality of slave nodes exist in the wireless local area network; and the master node and the slave node establish communication connection through a shielded differential twisted pair. The master node is configured to: receiving alarm state information sent from a node; the alarm state information is used for prompting whether an event to be alarmed exists at the position of the slave node; according to the alarm state information, determining the identification information of the slave node with the event to be alarmed; generating audio information and control information; wherein, the control information carries identification information; and transmitting the audio information and the control information to the slave node in a superposition manner by a frequency division multiplexing transmission manner and a differential current transmission manner. In the fire-fighting information transmission system, the main node transmits superposed control information and audio information to the slave node on the shielded differential twisted pair wire in a frequency division multiplexing transmission mode and a differential current transmission mode. Therefore, the number of transmission lines needed in the fire-fighting information transmission system is reduced, the anti-interference capacity of the system is improved, and the reliability of the fire-fighting information transmission system is improved.
Optionally, the system further includes a remote monitoring center, and the remote monitoring center establishes a communication connection with the wireless local area network through a wireless transmission manner; the fire fighting information transmission method further comprises:
and after receiving the position information of the event to be alarmed sent by the slave node, sending the position information to a remote monitoring center in a wireless transmission mode.
Optionally, the fire fighting information transmission method further includes:
receiving an upgrading instruction sent by a remote control center; and upgrading the program according to the instruction of the upgrading instruction.
Based on the same conception, the embodiment of the application also provides a fire-fighting information transmission device, which is applied to the main node in the fire-fighting information transmission system, wherein the main node is the main node in the wireless local area network in the fire-fighting information transmission system, a plurality of slave nodes are also arranged in the wireless local area network, and the main node and the slave nodes are in communication connection through a shielded differential twisted pair; as shown in fig. 11, the apparatus includes:
a receiving module 1101, configured to receive alarm state information sent from a node; the alarm state information is used for prompting whether an event to be alarmed exists at the position of the slave node.
A determining module 1102, configured to determine, according to the alarm state information, identification information of a slave node where an event to be alarmed exists.
A generating module 1103 for generating audio information and control information; the control information carries identification information.
And the sending module 1104 is configured to transmit the control information and the audio information to the slave node in a superimposed manner through a frequency division multiplexing transmission manner and a differential current transmission manner.
In the embodiment of the application, the system comprises a wireless local area network, wherein a main node and a plurality of slave nodes exist in the wireless local area network; and the master node and the slave node establish communication connection through a shielded differential twisted pair. The master node is configured to: receiving alarm state information sent from a node; the alarm state information is used for prompting whether an event to be alarmed exists at the position of the slave node; according to the alarm state information, determining the identification information of the slave node with the event to be alarmed; generating audio information and control information; wherein, the control information carries identification information; and transmitting the audio information and the control information to the slave node in a superposition manner by a frequency division multiplexing transmission manner and a differential current transmission manner. In the fire-fighting information transmission system, the main node transmits superposed control information and audio information to the slave node on the shielded differential twisted pair wire in a frequency division multiplexing transmission mode and a differential current transmission mode. Therefore, the number of transmission lines needed in the fire-fighting information transmission system is reduced, the anti-interference capacity of the system is improved, and the reliability of the fire-fighting information transmission system is improved.
An embodiment of the present application further provides an electronic device, as shown in fig. 12, including a processor 1201, a communication interface 1202, a memory 1203, and a communication bus 1204, where the processor 1201, the communication interface 1202, and the memory 1203 complete communication with each other through the communication bus 1204,
a memory 1203 for storing a computer program;
the processor 1201 is configured to implement any method step in the above-described embodiment of the fire protection information transmission method when executing the program stored in the memory 1203.
The communication bus mentioned in the network device may be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The communication bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown, but this does not mean that there is only one bus or one type of bus.
The communication interface is used for communication between the network device and other devices.
The Memory may include a Random Access Memory (RAM) or a Non-Volatile Memory (NVM), such as at least one disk Memory. Optionally, the memory may also be at least one memory device located remotely from the processor.
The Processor may be a general-purpose Processor, including a Central Processing Unit (CPU), a Network Processor (NP), and the like; the Integrated Circuit may also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), or other Programmable logic devices, discrete Gate or transistor logic devices, or discrete hardware components.
Based on the same technical concept, embodiments of the present application further provide a computer-readable storage medium, in which a computer program is stored, and the computer program, when executed by a processor, implements any one of the method steps in the above-mentioned fire-fighting information transmission method embodiments.
Based on the same technical concept, embodiments of the present application also provide a computer program product containing instructions, which when run on a computer, causes the computer to perform any one of the method steps in the above-mentioned fire fighting information transmission method embodiments.
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the application to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, as for the method and apparatus embodiments, since they are substantially similar to the system embodiments, the description is relatively simple, and reference may be made to some descriptions of the system embodiments for relevant points.
The above description is only for the preferred embodiment of the present application, and is not intended to limit the scope of the present application. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application are included in the protection scope of the present application.

Claims (9)

1. A fire fighting information transmission system, said system comprising a wireless local area network; a master node and a plurality of slave nodes exist in the wireless local area network; the master node and the slave node establish communication connection through a shielded differential twisted pair;
the slave node is configured to: detecting whether an event to be alarmed exists at the position of the slave node, and generating alarm state information for prompting whether the event to be alarmed exists; sending the alarm state information to the main node;
the master node is configured to: according to the received alarm state information, determining the identification information of the slave node with the event to be alarmed; generating audio information and control information; wherein the control information carries the identification information; transmitting the audio information and the control information to the slave node in a superposition manner through a frequency division multiplexing transmission manner and a differential current transmission manner;
the slave node is further configured to: receiving the audio information and the control information; when the identification information carried in the control information is matched with the identification information of the slave node, playing an alarm audio corresponding to the audio information according to the indication of the control information;
the slave node is further configured to: and after the alarm audio corresponding to the audio information is played, sending the position information of the slave node to the master node as the position information of the event to be alarmed.
2. The system of claim 1, further comprising a remote monitoring center; the remote monitoring center and the wireless local area network establish communication connection in a wireless transmission mode;
the master node is further configured to: receiving the position information of the event to be alarmed, which is sent by the slave node; sending the position information to the remote monitoring center in a wireless transmission mode;
the remote monitoring center is used for: and prompting the position of the position information to generate an alarm event.
3. The system of claim 2, wherein the remote monitoring center is further configured to:
and sending an upgrading instruction to the wireless local area network, wherein the upgrading instruction is used for indicating a main node and a slave node in the wireless local area network to carry out program upgrading.
4. The system of claim 1, wherein the master node is further configured to:
after the audio information and the control information are generated, increasing the voltage value of the audio information to a first preset voltage value;
the slave node is further configured to: after receiving the audio information and the control information, converting the audio information into a signal satisfying a preset frequency and a second preset voltage value as a power supply signal of the slave node; wherein the second preset voltage value is smaller than the first preset voltage value.
5. The system of claim 1, wherein the master node is further configured to:
sending a preset number of training signaling to the slave node before the audio information and the control information are transmitted to the slave node in a superposition manner; wherein the training signaling is used for determining a threshold value for decoding the training signaling;
the slave node is further configured to: after receiving the training signaling sent by the master node, decoding the training signaling;
after receiving the audio information and the control information, determining a threshold value when the training signaling is decoded as a threshold value for decoding the control information;
decoding the control information according to the threshold value to obtain decoded control information; wherein the decoded control information includes the identification information.
6. A fire-fighting information transmission method is characterized by being applied to a main node in a fire-fighting information transmission system, wherein the main node is a main node in a wireless local area network in the fire-fighting information transmission system, a plurality of slave nodes also exist in the wireless local area network, and the main node and the slave nodes are in communication connection through a shielded differential twisted pair; the method comprises the following steps:
receiving alarm state information sent by the slave node; the alarm state information is used for prompting whether an event to be alarmed exists at the position of the slave node;
according to the alarm state information, determining the identification information of the slave node with the event to be alarmed;
generating audio information and control information; wherein the control information carries the identification information;
and transmitting the control information and the audio information to the slave node in a superposition manner by a frequency division multiplexing transmission manner and a differential current transmission manner.
7. The method of claim 6, wherein the system further comprises a remote monitoring center; the remote monitoring center and the wireless local area network establish communication connection in a wireless transmission mode; the method further comprises the following steps:
and after receiving the position information of the event to be alarmed, sent by the slave node, sending the position information to the remote monitoring center in a wireless transmission mode.
8. The method of claim 7, further comprising:
receiving an upgrading instruction sent by the remote control center;
and upgrading the program according to the instruction of the upgrading instruction.
9. A fire-fighting information transmission device is characterized in that the fire-fighting information transmission device is applied to a main node in a fire-fighting information transmission system, the main node is a main node in a wireless local area network in the fire-fighting information transmission system, a plurality of slave nodes are also arranged in the wireless local area network, and the main node and the slave nodes are in communication connection through a shielded differential twisted pair; the device comprises:
the receiving module is used for receiving the alarm state information sent by the slave node; the alarm state information is used for prompting whether an event to be alarmed exists at the position of the slave node;
the determining module is used for determining the identification information of the slave node with the event to be alarmed according to the alarm state information;
the generating module is used for generating audio information and control information; wherein the control information carries the identification information;
and the sending module is used for transmitting the control information and the audio information to the slave node in a superposition manner in a frequency division multiplexing transmission manner and a differential current transmission manner.
CN202010148441.1A 2020-03-05 2020-03-05 Fire-fighting information transmission system, method and device Expired - Fee Related CN111431562B (en)

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