CN207397068U - A kind of environmental monitoring system based on wireless carrier communication - Google Patents
A kind of environmental monitoring system based on wireless carrier communication Download PDFInfo
- Publication number
- CN207397068U CN207397068U CN201721538090.5U CN201721538090U CN207397068U CN 207397068 U CN207397068 U CN 207397068U CN 201721538090 U CN201721538090 U CN 201721538090U CN 207397068 U CN207397068 U CN 207397068U
- Authority
- CN
- China
- Prior art keywords
- monitoring system
- signal
- environmental monitoring
- power line
- wireless carrier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Arrangements For Transmission Of Measured Signals (AREA)
- Selective Calling Equipment (AREA)
Abstract
The utility model provides a kind of environmental monitoring system based on wireless carrier communication, including host computer, modem, environmental parameter harvester, These field control modules, transmitter, actuator, measurement parameter Signal averaging is transmitted to modem by the environmental parameter harvester on the power line by transmitter, modem in each switch board is connected by MODBUS communication parts with host computer, host computer is connected with the These field control modules in this switch board, the These field control modules carry out the output of analog quantity or number, the actuator in this switch board is controlled to act the target call for reaching setting.Digital measuring signal is superimposed on the power line by this programme, is reduced the signal transmission error of field measuring instrument, is improved transmission precision, stability, antijamming capability and the response speed of field instrument signal.
Description
Technical field
The utility model is related to a kind of EMSs, are supervised more particularly, to a kind of environment based on wireless carrier communication
Control system.
Background technology
Current traditional environment detecting system main " centralization " control, live measuring instrumentss and equipment pass through signal electricity
Cable transmission measurement signal carries out logical operation as main controller using PLC or DDC and sends actuator of the control signal to scene
Or equipment.
Operating personnel monitor the temperature of workshop each several part, humidity, pressure and equipment in central control room upper computer
The parameters such as temperature, pressure, flow, frequency, and above-mentioned parameter is recorded in real time, Central Control Room operating personnel can pass through monitoring
System interface checks real time data, and is operated accordingly.
It is had the following problems in the program：The long distance transmission errors of analog signals is big, demarcate cumbersome, discreteness compared with
Greatly；The power supply and control signal of actuator need individually control cable, add engineering construction cost.
OFDM is a kind of several signals independent of each other to be merged into a compound letter that can be transmitted on the same channel
Number method.The basic principle of its data transmission is that converting serial data streams are used it into the relatively low parallel data stream of N roads rate
Modulate parallel transmission after N subcarriers respectively, its mutually orthogonal frequency spectrum of subcarrier is overlapped, so as to very strong anti-letter
Road fading capability and the higher availability of frequency spectrum, and intersymbol interference can be inhibited well.Wherein, orthogonal frequency division multiplex OFDM
(Orthogal Frequency Division Multiplexing) technology can preferable modulation-demodulation signal, utilize this special
Property, this programme proposes a kind of power line carrier communication scheme scheme based on OFDM, using power cord as transmission medium, passes through carrier wave
Mode transmits digital signal, and without outrigger communication line.
Utility model content
The utility model provides a kind of environmental monitoring system based on wireless carrier communication,
A kind of environmental monitoring system based on wireless carrier communication, including host computer, modem, environmental parameter acquisition
Device, These field control modules, transmitter, actuator, the environmental parameter harvester is by transmitter by measurement parameter signal
Be superimposed upon on power cord and be transmitted to modem, the modem in each switch board by MODBUS communication parts with it is upper
Machine is connected, and host computer is connected with the These field control modules in this switch board, the These field control modules carry out analog quantity or
The output of person's number controls the actuator in this switch board to act the target call for reaching setting.
It is using the modulation /demodulation module based on orthogonal frequency division multiplex OFDM technology in the modem.
Power line carrier module, power line carrier module bag are both provided in the modem and These field control modules
It includes control chip DSP F28335 and is connected with UART devices, A/D and D/A converter, the programmable logic device connect
Part, FLASH, JTAG, house dog, SRAM, the UART devices are connected with MODBUS communication part serial ports, the A/D and D/A
Converter is connected with channel.
The programmable logic device is used to change logic function of the power line carrier module with fixed inner connection circuit, comes
It realizes and logical block grade is programmed, and be stored in FLASH so that data will not lose during power down.
Modem carries out the SRAM in power line carrier module data high-speed reading, and the amendment after calibration is bent
Line parameter is stored in FLASH.
MODBUS communication parts use the standard stitch and cable that RS-232C serial line interfaces define, and with having write equipment
Location, signal position, Transmission bit rate, even-odd check.
In power line carrier module, the clock line in JTAG is connected on the control terminal of watchdog chip, in communication process
In lasting pulse signal is provided for house dog, so as to avoid WatchDog Timer overflow, flip chip reset.
For power line carrier module by the information source information stream of high-speed by serial to parallel conversion, the N roads for being transformed into low rate are parallel
Data flow, then this N circuit-switched datas stream is transferred on N number of mutually orthogonal subcarrier by modulation /demodulation module respectively, then N roads are modulated
Signal afterwards is added up to transmitting signal.
These field control modules send actuator control signal using internal microcontroller, and actuator is to the cold water at scene
Valve, steam valve, steam valve are adjusted, and realize control and management remotely to live humiture environmental parameter.
The utility model is added by devising the modulation /demodulation module based on orthogonal frequency division multiplex OFDM technology
MODBUS communication parts, MODBUS communication parts use the standard stitch and cable that RS-232C serial line interfaces define, and write
Device address, signal position, Transmission bit rate, even-odd check.MODBUS communication parts allow modulation /demodulation module and mainstream
Upper configuration software or scene PLC communicated, effectively increase the exploration and flexibility of system.
It is communicated as a result of the measuring instrumentss of modulation /demodulation module and scene, every instrument has that oneself is independent and only
One address, the arrange parameter of instrument can be remotely located in control room progress, when accelerating installation, the debugging of project
Between；Each produced on-site workshop can place 1 carrier communication module and the host computer of master control room is communicated, and reduces substantial amounts of
Cable material expense and its laying work amount, reduce construction investment cost.Using the communications protocol of " bus " type, improve and be
The scalability of system：System can increase new measuring instrumentss or control module according to site requirement at any time；The mould can also be used
Block forms multiple subsystems, and subsystems are uploaded to the master station of Central Control Room by MODBUS bus protocols.
Digital measuring signal is superimposed on the power line by this programme, reduces the signal transmission error of field measuring instrument,
Improve transmission precision, stability, antijamming capability and the response speed of field instrument signal.
Description of the drawings
Fig. 1 is the principle schematic of power line carrier communication；
Fig. 2 is the modulation /demodulation block diagram of power line carrier module；
Fig. 3 is the overall network framework of environmental monitoring system provided by the utility model.
Specific embodiment
It is carrier terminal equipment 3 by combining Carrier 4, coupled capacitor device 2 as shown in Figure 1, power line carrier communicates, using
Trap 1 will be on signal carrier to power cord.Principle is the prior art, no longer excessive description.
The utility model include host computer, modem, environmental parameter harvester, These field control modules, transmitter,
Measurement parameter Signal averaging is transmitted to modulatedemodulate by actuator, the environmental parameter harvester on the power line by transmitter
Device is adjusted, the modem in each switch board is connected by MODBUS communication parts with host computer, host computer and this switch board
Interior These field control modules are connected, and the These field control modules carry out the output of analog quantity or number, control this switch board
Interior actuator action reaches the target call of setting.
Power line carrier module is both provided in the modem and These field control modules, as shown in Fig. 2, power cord
Carrier module be based on DSP F28335 design, power line carrier module include control chip DSP F28335 and with its point
UART devices, A/D and D/A converter, programmable logic device, FLASH, JTAG, house dog, the SRAM not being connected, number
According to transfer process.
In transmitting terminal, binary data is transmitted to UART devices by MODBUS communication part serial ports first, passes through UART
Device serioparallel exchange, parallel data is exported by UART parallel ports gives DSP parallel ports, and DSP is again modulated data algorithm process, then
Data are converted digital signals into analog signal, and are sent in channel by D/A converter.
In its receiving terminal, A/D converter input terminal receives the analog signal transmitted in channel, first carries out analog signal
A/D is converted, and then, the algorithm process that the digital signal of conversion is demodulated by DSP, data are sent to again by DSP parallel ports
UART so as to fulfill parallel-serial conversion, then by PC machine serial ports is sent to PC machine, reaches host computer.
It is using the modulation /demodulation module based on orthogonal frequency division multiplex OFDM technology in the modem.Power cord
The information source information stream of high-speed by serial to parallel conversion, is transformed into the N channel parallel data streams of low rate, modulation /demodulation by carrier module
Then this N circuit-switched datas stream is transferred on N number of mutually orthogonal subcarrier by module respectively, then be by the modulated signal addition in N roads
Signal must be emitted.
The transmitter of modulation /demodulation module and measuring instrumentss is communicated, by measurement parameter Signal averaging on the power line,
It is transmitted to modulation /demodulation module to be parsed, the transmission mode of digital signal avoids the circuit damage in the transmission of traditional analog amount
It loses so that upper level monitoring system is more accurate to the measurement of field data, record is more timely.
There is the logic function of fixed inner connection circuit by changing to realize pair in Complex Programmable Logic Devices (CPLD)
Logical block grade programs, and is stored in FLASH, and data will not lose during power down；Modem carries out data high-speed to SRAM
It reads, and the fair curve parameter after calibration is stored in FLASH.
It, will using the clock line (TCK) in JTAG in order to make the emulation of power line carrier module and the more reliable stabilization of programming
It is connected on the control terminal of watchdog chip, will provide lasting pulse signal for house dog so in communication process, so as to
WatchDog Timer spilling is avoided, flip chip resets.
These field control modules are used to receive the control command that long-range host computer is sent, and utilize and power line carrier module phase
The internal microcontroller of connection sends live actuator control signal, and actuator is to the Cold water tap, steam valve, steaming at scene
Steam valve door is adjusted, and realizes control and management remotely to environmental parameters such as live humitures, saves man power and material,
Using more convenient.
As shown in figure 3, master control room runs configuration software using industrial computer, by the connections of MODBUS agreements with it is each
Modulation /demodulation module in switch board is communicated, and is communicated using the bus form of extension.Modulation /demodulation module will
Control parameter Signal averaging on the power line, the control module at scene is transmitted to by host computer, and These field control modules carry out mould
The output of analog quantity or number, actuator act the target call for reaching setting.In this way, the setting of environmental parameter harvester is each
Sensor to measured values such as temperature, humidity, flcating germ, the dust particles at scene, is folded measurement parameter signal by transmitter
Add on the power line, be transmitted to modulation /demodulation module；After modulation /demodulation module parsing carrier signal, by MODBUS connections
Host computer is reached, shown, gathered and is controlled on host computer.
By taking temperature signal as an example, measurement data by transmitter is superimposed upon on power cord and transmitted by scene temperature measuring cell
To modem, analog signals are transformed into digital signal and are transported to DSP by the A/D converter of power line carrier inside modules
F28335, DSP F28335 call the calibration data of FLASH and SRAM storages and corresponding calculation formula, UART will be by DSP
The parallel data sent inside F28335 is converted to the serial data stream of output, and MODBUS communication parts advise serial signal
The MODBUS signal transmissions of mark are made into host computer.Operating personnel send valve site, motor or execution on host computer
The start and stop instruction of device, technique, equipment production to scene control.
The utility model has the characteristics that：
1) the modulation /demodulation module based on orthogonal frequency division multiplex OFDM technology is devised, reduces the letter of field measuring instrument
Number transmission error, improve transmission precision, antijamming capability.
2) the serial to parallel conversion program of optimization, response speed block have been write in modulation /demodulation module.
3) modulation /demodulation module adds MODBUS communication parts and upper Communication for Configuration Software, realizes remotely to scene
The control and management of the environmental parameters such as humiture, save man power and material.
4) modulation /demodulation module adds MODBUS communication parts and is communicated with PLC, live actuator is carried out long-range
Communication Control, control are precisely quick.
5) system software is devised, builds the control system for meeting environmental monitoring.
Claims (9)
1. a kind of environmental monitoring system based on wireless carrier communication, it is characterised in that：Including host computer, modem, ring
Border parameter acquisition devices, These field control modules, transmitter, actuator, the environmental parameter harvester will be surveyed by transmitter
Amount parameter signal, which is superimposed upon on power cord, is transmitted to modem, and the modem in each switch board is communicated by MODBUS
Component is connected with host computer, and host computer is connected with the These field control modules in this switch board, the These field control modules into
The output of row analog quantity or number controls the actuator in this switch board to act the target call for reaching setting.
2. the environmental monitoring system according to claim 1 based on wireless carrier communication, it is characterised in that：The modulatedemodulate
It adjusts in device, is using the modulation /demodulation module based on orthogonal frequency division multiplex OFDM technology.
3. the environmental monitoring system according to claim 1 based on wireless carrier communication, it is characterised in that：The modulatedemodulate
It adjusts and power line carrier module is both provided in device and These field control modules, power line carrier module includes control chip DSP
F28335 and be connected with the UART devices, A/D and the D/A converter that connect, programmable logic device, FLASH, JTAG,
House dog, SRAM, the UART devices are connected with MODBUS communication part serial ports, the A/D and D/A converter and channel phase
Connection.
4. the environmental monitoring system according to claim 3 based on wireless carrier communication, it is characterised in that：It is described programmable
Logical device is used to change logic function of the power line carrier module with fixed inner connection circuit, and logical block grade is compiled to realize
Journey, and be stored in FLASH so that data will not lose during power down.
5. the environmental monitoring system according to claim 3 based on wireless carrier communication, it is characterised in that：Modem
Data high-speed reading is carried out to the SRAM in power line carrier module, and the fair curve parameter after calibration is stored in FLASH
In.
6. the environmental monitoring system according to claim 3 based on wireless carrier communication, it is characterised in that：MODBUS is communicated
Component uses the standard stitch and cable that RS-232C serial line interfaces define, and has write device address, signal position, transmission baud
Rate, even-odd check.
7. the environmental monitoring system according to claim 3 based on wireless carrier communication, it is characterised in that：Power line carrier
In module, the clock line in JTAG is connected on the control terminal of watchdog chip, continues for being provided in communication process for house dog
Pulse signal, so as to avoid WatchDog Timer overflow, flip chip reset.
8. the environmental monitoring system according to claim 3 based on wireless carrier communication, it is characterised in that：Power line carrier
The information source information stream of high-speed by serial to parallel conversion, is transformed into the N channel parallel data streams of low rate, then modulation /demodulation by module
This N circuit-switched datas stream is transferred on N number of mutually orthogonal subcarrier by module respectively, then the modulated signal in N roads is added to send out
Penetrate signal.
9. the environmental monitoring system according to claim 1 based on wireless carrier communication, it is characterised in that：Field control mould
Block sends actuator control signal using internal microcontroller, and actuator is to the Cold water tap, steam valve, steam at scene
Valve is adjusted, and realizes control and management remotely to live humiture environmental parameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721538090.5U CN207397068U (en) | 2017-11-17 | 2017-11-17 | A kind of environmental monitoring system based on wireless carrier communication |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721538090.5U CN207397068U (en) | 2017-11-17 | 2017-11-17 | A kind of environmental monitoring system based on wireless carrier communication |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207397068U true CN207397068U (en) | 2018-05-22 |
Family
ID=62323871
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721538090.5U Active CN207397068U (en) | 2017-11-17 | 2017-11-17 | A kind of environmental monitoring system based on wireless carrier communication |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207397068U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109672477A (en) * | 2019-01-29 | 2019-04-23 | 天津师范大学 | A kind of acoustic array power supply and order downlink multiplex system and its control method based on pulse density modulated |
-
2017
- 2017-11-17 CN CN201721538090.5U patent/CN207397068U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109672477A (en) * | 2019-01-29 | 2019-04-23 | 天津师范大学 | A kind of acoustic array power supply and order downlink multiplex system and its control method based on pulse density modulated |
| CN109672477B (en) * | 2019-01-29 | 2023-08-29 | 四川天源宏创科技有限公司 | Acoustic array power supply and command downlink multiplexing system based on pulse density modulation and control method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204461490U (en) | A kind of hyperchannel multiplexed signals automatic acquisition device with artificial comparing and testing function | |
| CN103945017B (en) | One kind is based on Modbus-ZigBee agreements linking address automatic mapping technical method and conversion equipment | |
| CN207397068U (en) | A kind of environmental monitoring system based on wireless carrier communication | |
| CN103501189B (en) | Based on the network data conversion device of power line carrier communication | |
| CN202956883U (en) | Distributed data monitoring system based on wireless data transmission | |
| CN206171361U (en) | Road train's wheel quick test volume and transmission system | |
| CN107872271A (en) | Public network communication relays and communication means based on LoRa technologies | |
| CN205103648U (en) | Multisource sensing information acquisition and control integration multipurpose plant suitable for networking of agricultural thing is used | |
| CN102223403A (en) | Intelligent instrument online-diagnosis and management system based on wireless HART (Highway Addressable Remote Transducer) protocol | |
| CN101729339A (en) | Fieldbus communication card | |
| CN205121258U (en) | Controller extension module based on STM32 singlechip | |
| CN106060969A (en) | Water meter centralized-reading device in master-slave machine mode | |
| CN204244251U (en) | A kind of monitoring circuit of RS485 bus | |
| CN207799499U (en) | Farm's environment remote monitoring system based on self-defined web page | |
| CN2881092Y (en) | Automatic monitoring device pumping parameter of beam-pumping unit | |
| CN205003511U (en) | Integration big dipper industry measurement and control terminal | |
| CN201698572U (en) | Bluetooth wireless measuring system for engineering machinery | |
| CN107864003A (en) | A kind of public network repeater that communication is realized with LoRa wireless technologys | |
| CN106373355A (en) | Method for collecting multiple different types of meter data by using single device | |
| CN204119270U (en) | Based on the intelligent distribution network wireless communication system of hybrid protocol | |
| CN103412510A (en) | Method for transmitting data of generator excitation regulator to intelligent power station | |
| CN209358532U (en) | One kind having DTU function communication processor | |
| CN203758550U (en) | Wireless monitoring system for nursery of plants | |
| CN112383894A (en) | Centralized ship-shore data monitoring device | |
| CN202957846U (en) | Automatic rainfall acquisition and transmission system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |