CN102695295A - Distributed data acquisition control system and method for applying same - Google Patents
Distributed data acquisition control system and method for applying same Download PDFInfo
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Abstract
The invention provides a distributed data acquisition control system which comprises a remote monitoring platform and more than one wireless communication data acquiring units. The remote monitoring platform is connected with the wireless communication data acquiring units through the WiMin wireless network. The WiMin system has unique advantages in the aspects of critical performances such as network coverage, data transmission speed and power consumption and can be widely applicable to various complicated environment due to strong and flexible networking thereof. Therefore, the problems of high construction cost and construction difficulty of wired communication and the problems of short communication distance of Zigbee, WiFi and the like in the wireless communication and about signal coverage areas and posterior running cost of the GSM (global system for mobile communication)/CDMA (code division multiple access) are all solved by the WiMin data communication technology.
Description
Technical field
The invention belongs to heat supply control technology field, be specifically related to a kind of Distributive Data Acquisition and Control System and use the method for this system.
Background technology
In view of the needs of energy-saving and emission-reduction and low-carbon (LC) life, and the development of heating system and hot user be to the raising of heat demand, rationally controls heating system operating cost, reduces the most important thing that heating system discharging and raising heating efficiency have become current enterprise development.
At present, heat-supplying mode is generally the central heating mode, and the communication modes that in central heating system, adopts mainly comprises following three types: Zigbee, Wi-Fi and GSM/CDMA pattern.Mainly there is the defective of following defective: Zigbee in these three types of wireless communication modes: communication distance is short, can only satisfy the communication of scope in 100 meters usually; Penetrability is bad, and barrier thickness etc. influences communication distance.The defective of Wi-Fi: communication distance is short, can only satisfy the communication of scope in 100 meters usually; Penetrability is bad, and barrier thickness etc. influences communication distance.Because the data acquisition unit in the heating system is applied to heat exchange station, be arranged on the ground and heat exchange station has, what have is arranged on basement, and therefore, Zigbee and Wi-Fi communication mode can't cover the basement wireless signal.And the communication distance between the supervisory control system of heat exchange station and upper level is usually greater than 100 meters, and this just makes Zigbee, the Wi-Fi application in heating system receive certain restriction; The defective of GSM/CDMA: limited by signal coverage areas, and the later stage running cost is higher.
Summary of the invention
Defective to the prior art existence; The present invention provides a kind of Distributive Data Acquisition and Control System and uses the method for this system; Remote monitoring platform and each wireless communication data collecting unit preferably resolve the network blind area of coverage problem through the WiMin wireless communication; Preferably resolve the contradictory problems of the far away and later stage operating cost of communication distance.
The present invention provides a kind of Distributive Data Acquisition and Control System, comprising: remote monitoring platform and an above wireless communication data collecting unit; Said remote monitoring platform is connected through the WiMin wireless network with each said wireless communication data collecting unit.
Preferably, each said wireless communication data collecting unit comprises: main control module, communication module and an above I/O module; Said main control module is connected with said I/O module with said communication module respectively.
Preferably, adopt the RS485 universal serial bus to be connected between said main control module and the said communication module; Adopt the RS485 universal serial bus to be connected between said main control module and each said I/O module.
Preferably, said main control module and said communication module constitute host node, and each said I/O module is from node; Said host node is said from node communication through point-to-point communication mode and each, and perhaps, said host node is said from node communication through broadcast communication mode and each.
Preferably, comprise 1-20 said I/O module in each said wireless communication data collecting unit.
Preferably, said WiMin wireless network has following characteristics:
(1) operating frequency of said WiMin wireless network is 480MHz～510MHz;
(2) said WiMin wireless network is supported 10 groups of multiplexing and frequency hoppings in frequency space of totally 20 frequencies, adopts the network organization mode of honeycomb;
(3) said WiMin wireless network is made up of a plurality of WiMin nodes, and the pattern field ground point-to-point communication distance of each said WiMin node is 500 meters;
(4) in the said WiMin wireless network, the wireless network layer technology comprises: dynamic address generating algorithm, network degeneration algorithm and network are from maintenance algorithm;
(5) said WiMin wireless network runs on the data-modulated bandwidth of 38.4KHz, uses sub-packet aggregation, message buffering and batch affirmation mechanism in transport layer;
(6) said WiMin wireless network adopts the scheme that increases the base station to expand for network; Wherein, each said base station works in the wireless frequency that has nothing in common with each other, and independent operating each other is connected to data center with the spoke subnet of a plurality of high coverings and high-fidelity through Ethernet;
(7) said WiMin wireless network has carried out group's division to each node, but the MAC layer adopt competition slot with can not competition slot.
The present invention also provides a kind of Distributive Data Acquisition and Control method of using above-mentioned Distributive Data Acquisition and Control System, adopts the self-defined stipulations communication mode of question and answer mode between said main control module and each the said I/O module; Specifically may further comprise the steps:
Said main control module is configured each said I/O module;
The heating parameter of said I/O module acquiring heat supply system, and this heating parameter sent to said main control module;
Said main control module receives said heating parameter, said heating parameter is carried out analysis and judgement after, controlled amount, and said controlled quentity controlled variable sent to said I/O module;
Said I/O module is according to the running status of heating equipment in the said controlled quentity controlled variable control heating system.
Preferably, said I/O module is used for one or more in the acquiring heat supply system following parameters: boiler, once supply force value, temperature value, flow value and the calorie value of backwater with secondary.
Preferably, said I/O module is specially according to the running status of heating equipment in the said controlled quentity controlled variable control heating system: said I/O module is according to the operating condition of circulating pump, small pump and electrically operated valve in the said controlled quentity controlled variable control heating system.
Distributive Data Acquisition and Control System provided by the invention and use the method for this system; Remote monitoring platform and each wireless communication data collecting unit are through the WiMin wireless communication; WiMin works in 480MHz～510MHz; Belong to micropower and exempt to apply for amateur band, need not extra mandate expense or network third party and support; WiMin supports 10 groups of multiplexing and frequency hoppings in frequency space of totally 20 frequencies, adopts the network organization mode of honeycomb, has improved frequency utilization efficient and extension of network property; The pattern field ground point-to-point communication distance of WiMin node is 500 meters; And in each cellular cell scope, support self-organizing multi-hop transmission technology (Ad Hoc & Multi Hop); Make the effective covering radius in real place of each cellular cell reach 500 meters～2000 meters, and preferably resolve the network blind area of coverage problem; Preferably resolve the contradictory problems of the far away and later stage operating cost of communication distance.
Description of drawings
Fig. 1 is the structural representation of Distributive Data Acquisition and Control System provided by the invention;
Fig. 2 is the technical schematic diagram of Wimin provided by the invention;
Fig. 3 is the WiMin OSI of system network model figure provided by the invention;
Fig. 4 is the structure principle chart of basic structural unit microcellulor in the WiMin network.
Embodiment
Describe below in conjunction with the accompanying drawing specific embodiments of the invention.
As shown in Figure 1, the present invention provides a kind of Distributive Data Acquisition and Control System, comprising: remote monitoring platform and an above wireless communication data collecting unit; Said remote monitoring platform is connected through the WiMin wireless network with each said wireless communication data collecting unit.Each said wireless communication data collecting unit comprises: main control module, communication module and an above I/O module; Said main control module is connected with said I/O module with said communication module respectively.Wherein, adopt the RS485 universal serial bus to be connected between said main control module and the said communication module; Adopt the RS485 universal serial bus to be connected between said main control module and each said I/O module.Can comprise maximum 20 said I/O modules in each said wireless communication data collecting unit.
Said main control module and said communication module constitute host node, and each said I/O module is from node; Said host node is said from node communication through point-to-point communication mode and each, and perhaps, said host node is said from node communication through broadcast communication mode and each.At host node with from node communication routine, any communication all must be started by host node, starts the transmission of related data from the related command of node response host node, does not allow from the initiatively communication of log-on data of node.Concrete; The I/O module comprises 8DI, 4DR, 4AI, 2AO, 4RD, 4TC totally 6 types of I/O modules, and on concrete the realization, the hardware configuration of I/O module can be selected the cassette die combination for use; Adopt the unitization structure, have advantage simple, can independent assortment flexibly and between each module.The I/O module and the main control module order of connection can be defined as: 1-20.Host node comprises to the command type that sends from node: start, read or write order etc.The communication modes of I/O module and host node can be realized through following form: each I/O block configuration has and is used for representing the I/O module's address a unique ID number and is kept among the FLASH, is defaulted as 01, can makes amendment with software for ID number.All instructions that send to the I/O module all comprise this ID number, that is: have only the I/O module of this address just can reply.
The present invention also provides a kind of Distributive Data Acquisition and Control method of using above-mentioned Distributive Data Acquisition and Control System, adopts the self-defined stipulations communication mode of question and answer mode between said main control module and each the said I/O module; Specifically may further comprise the steps:
Said main control module is configured each said I/O module;
The heating parameter of said I/O module acquiring heat supply system, and this heating parameter sent to said main control module;
Concrete, said I/O module is used for one or more in the acquiring heat supply system following parameters: boiler, once supply force value, temperature value, flow value and the calorie value of backwater with secondary.
Said main control module receives said heating parameter, said heating parameter is carried out analysis and judgement after, controlled amount, and said controlled quentity controlled variable sent to said I/O module;
Said I/O module is according to the operating condition of heating equipment in the said controlled quentity controlled variable control heating system.
Concrete, said I/O module is specially according to the running status of heating equipment in the said controlled quentity controlled variable control heating system: said I/O module is according to the operating condition of circulating pump, small pump and electrically operated valve etc. in the said controlled quentity controlled variable control heating system.
Be not difficult to find out that through above contrast all there is own original advantage in the WiMin system on key performances such as the network coverage, message transmission rate, power consumption, especially it is strong and networking flexibly can be applicable to various complex environments widely.Therefore, the WiMin data communication technology has solved the problem that the wire communication cost is high, construction is difficult; Solved short and the signal coverage rate of GSM/CDMA and the problem of later stage operating cost of the communication distance of Zigbee, WiFi etc. in the wireless telecommunications.
Introduce the Wimin technology that preceding text relate to below:
1, the know-why of Wimin
Novel wireless data access system-WiMin microcellulor low-consumption wireless Internet of Things data access platform.WiMin works in 480MHz～510MHz, belongs to micropower and exempts to apply for amateur band, need not extra mandate expense or network third party and supports; WiMin supports 10 groups of multiplexing and frequency hoppings in frequency space of totally 20 frequencies, adopts the network organization mode of honeycomb, has improved frequency utilization efficient and extension of network property; The pattern field ground point-to-point communication distance of WiMin node is 500 meters; And in each cellular cell scope, support self-organizing multi-hop transmission technology (Ad Hoc & Multi Hop); Make the effective covering radius in real place of each cellular cell reach 500 meters～2000 meters, and preferably resolve the network blind area of coverage problem; WiMin provides RS232, RS-485 and UART general equipment interface, can be respectively with " plug-in " perhaps " embedding " mode link to each other with subscriber equipment, have good versatility.
As shown in Figure 2, WiMin has distributed and characteristic integrated system concurrently, has network coverage height, structure is flexible, reliability is high, highly versatile, construction lay characteristics such as simple, easy to maintenance, that the engineering total cost is low; Be applicable to aspects such as transfer of data and access under remote data acquisition, the special adverse circumstances, like supervisory control system of industry control data acquisition system, water, electricity and gas Automatic meter reading system, underground well and pipeline etc.
The WiMin system is made up of two category node equipment: " WAT accesses terminal " and " inserting center WAC ".
● (WAT) accesses terminal: be installed on each user data collection point, link to each other with the user's data collecting device, constitute the infrastructure device that the data acquisition in the WiMin system inserts, be responsible for the access center (WAC) of the user data transmission that collects to appointment.
In the WiMin system WAT not only can be directly with covering radius in WAC communicate by letter; Also has the data forwarding function simultaneously; Can be that its adjacent WAT transmits data, a plurality of WAT are formed into the multi-hop communication link of WAC according to the self-organizing network routing policy, have increased the coverage of network greatly.
● access center (WAC): be installed on the user's data treatment facility, be formed in the data center's access point in certain geographical regional extent, be responsible for receiving all accessing terminal in the one's respective area; The function class of WAC is similar to base station or the AP among the WLAN in the Cellular Networks; Be responsible for collecting the data that all collecting units are gathered in the microcellulor sub-district; While can also be through data in the appropriate configurations completion sub-district to the forwarding of data processing centre for the situation of the data processing center in a plurality of sub-districts.
In the WiMin system, WAT and data acquisition system, WAC and data handling system interconnect, and co-ordination constitutes complete data acquisition connecting system jointly.Therefore, the WiMin system is actually the terminal of a data communication.Data acquisition system is given WAT with the data that collect and is sent, and after the data that WAC reception WAT sends, is transmitted to data handling system again and carries out subsequent treatment.
As shown in Figure 3, be the OSI of WiMin system network model figure.
Physical layer: Physical Layer
The State Control of this layer control radio frequency chip is accomplished transmitting and receiving data
(1) launches forward error correction algorithm and data albefaction, improve the packet antijamming capability
(2) half-duplex of control radio frequency chip is switched, and literary composition receives and send datagram
(3) data are carried out the hardware CRC check, guarantee data correctness
(4) carry out frequency trim for radio frequency chip, guarantee that the radio frequency centre frequency of main and subordinate node is aimed at
MAC layer: Media Access Control Layer
Accomplish the management and the scheduling of wireless network, realize the distribution and the release of wireless network resource
(1) extraction local terminal and the other side's electromagnetic signal strength (RSSI) and signal connecting quality (LQI), the assessment network condition
(2) obtain the state of current network: " idle ", " just busy ", " in the transmission ", " not having service " returns to the upper strata
(3) host node is in charge of and is distributed radio channel resource, and child node is distributed radio channel resource with the competitive way request
(4) searching request of child node response host node, return node action message (similar ping order) is used for node administration
(5) the idle wireless network base station of search filters out signal optimum one and lock channel
WNP layer: Wireless Node Protocol Layer
This layer is mainly used in the addressing and the multicast management of node
(1) dynamic management and the more communication state of new node
(2) multiple spot addressing and the Address Recognition under the broadcast mode
Transport layer: Transfer Control Protocol Layer
This layer is mainly used in the reliability of control data transmission
(1) Control Node on line, transmission and off-line are to upper strata report transmission state
(2) the affirmation request of control transmission process is mended bag and is replied affirmation
(3) unpacking and package of control data message realizes transmitting in batches
(4) transmitting terminal carries out sub-packetize to the data message, and receiving terminal carries out sub-packet aggregation to the data message
Application layer: Application Layer
This layer particular content realized by the outside user of wireless module, only realizes the interactive interface with application layer in inside modules
(1) receives from the next control command of HPI, the running parameter and the pattern of change and read module
(2) receive from the next periodic queries of HPI, realize the plastic flow control the wireless transmit buffering area
(3) receive from the next data of HPI, write the data buffering pond of protocol stack
(4) arrive HPI with the wireless data of receiving of stream interface form output
(5) correctness of verification HPI message guarantees that the transfer of data of HPI does not have packet loss and Cuo Bao (optional closing)
2, the comparison of the technical characterstic of Wimin and correlation technique
In data acquisition A MR field, frequently-used data access technology scheme compares:
1, wired mode:
(1) power line carrier mode:
Advantage: network distributes extensively, can carry out both-way communication.
Not enough: some low-voltage networks of China, wiring is mixed and disorderly, and load variations is very big and lack regularity, and various interference are very serious, and the application result of existing power line carrier AMR system shows, fails to obtain satisfied effect.
(2) telephone wire mode:
Advantage: network distributes extensively, can carry out both-way communication
Not enough: because telephone wire is public, often clash during communication, the transmission that has both influenced data also transfers the operate as normal of department to cause interference to electricity, and this kind mode normal, stable operation also has certain influence to the communication section stored-program control exchange.
(3) private-line mode:
Advantage: transmission is reliable
Not enough: the wiring installation cost is high, difficulty greatly, easy care not
2, wireless mode:
Technical scheme based on digital mobile cellular telecommunication network (GPRS, CDMA 1X)
Advantage: realize simple
Not enough: cost problem, covering problem.
In WiMin, the link between design WAT and the WAC is at most 4 jumpings.WAC around each WAT in the 4 jumping scopes constitutes one " microcellulor ", and is as shown in Figure 4.
" microcellulor " is a basic structural unit among the WiMin (Cellular), and according to the situation of actual application environment, whole WiMin system can be made up of one or more " microcellulor ".Network configuration in " microcellulor " is called " Intranet ", and a plurality of microcellulors sub-district constitutes " outer net " of platform, the concrete definition as follows:
Microcellulor (Cellular): refer to the region radius 500～2000 meters set, be distributed in the set of the ammeter data access point in this territorial scope like in a certain sub-district all with interior access point.
Intranet (Insider Net): refer to the network configuration that in single microcellulor, forms.
Outer net (Marco Net): refer in certain region; Faced mutually or collection of network that close microcellulor (Cellular) constitutes by a plurality of, check meter like unified implementation the in a certain city, this city is divided into several sub-districts when planning; Constitute the network in this city by a plurality of sub-districts, be referred to as outer net.
The course of work of WiMin is roughly following:
In the WiMin platform, each data collection point all assembles a WAT, WAC of configuration in each microcellulor.
WAT is sent to the sensing data of collecting the WAC of its place microcellulor;
WAC will collect the data in the microcellulor of place, give user's (program) then and handle.
Big when the distribution of system acquisition point, when needing a plurality of microcellulors to cover whole zone, then the WAC in each microcellulor then sends the data of collecting to the subscriber data center of whole network again.Then accomplish transmission from each WAC to subscriber data center with dedicated channel (wired or wireless) independently.
For avoiding the interference of each microcellulor minizone, WAC in the WiMin platform and WAT support the frequency division multiplexing to 10 groups of 20 frequencies.Each microcellulor sub-district all is assigned with one group of frequency (every group of two frequencies), and the employed frequency group of adjacent micro cellular cell is different.Inner in each microcellulor sub-district, on two frequencies, communicate between WAC and the WAT with the mode of frequency hopping at a slow speed
From above contrast, be not difficult to find out; Compare with other data insertion systems; WiMin has distributed and characteristic integrated system concurrently, has network coverage height, structure is flexible, reliability is high, highly versatile, construction are laid many advantages such as simple, easy to maintenance, that the engineering total cost is low; Aspects such as transfer of data under remote data acquisition, special adverse circumstances and access have improved the robustness and the availability of system greatly.
The characteristics of WiMin data insertion system:
Networking technology is different: 1, we do not need manual intervention for full-automatic networking; Other system needs artificial parameter such as the frequency etc. of being provided with to the scene.2, we realize and client's mutual communication, and node can network automatically, reports alert data;
The maintenance mode of system is different: 1, our node can realize that remote radio upgrade safeguards, 2, our network has self-healing function.
Reliability is different:
1, our system has adaptive frequency-selecting and frequency hopping can be avoided some interference automatically;
2, chip different radio frequency performance index are different, and we have certain advantage.
3, the complexity difference is installed by system: our system does not need the technical staff to arrive on-the-spot guidance;
3.Wimin main contents and key technology
(1) main contents of research and development:
" WiMin microcellulor low-consumption wireless Internet of Things data access platform " is a kind of short-distance wireless communication technology that we research and develop---WiMin network system, and reaching with WiMin is application system WEMS and the UDC that kernel is developed.
The WiMin network is structured in physical layer on the radio frequency of 480MHz; The penetration power that can obtain UHF (Ultra High Frequency:300MHz to 3GHz) frequency band low side is strong; Electromagnetic propertys such as the antidamping ability is good, this characteristic can be tackled the challenge of electromagnetic signal hydridization (multipath effect) under the complex communication conditions such as building and housing-group preferably; At MAC (Media Access Control) layer of competition access scheme that has adopted fair equity, controlling links is provided to distributed data acquisition and the concurrent request of multiple spot; Realized the tcp transmission control protocol of high buffering in transport layer, at the high-throughput that has guaranteed also to provide outside user data correct reliable wireless network; Carry out seamless link at top layer through the HPI of binary stream form and user's application layer; The wireless network solution of a client/server intactly is provided, and the application in data high reliability field has brought new experience for wireless transmission to give the user.
As a kind of novel wireless data access system, through the realization of multinomial key algorithm, the WiMin network system possesses following characteristics:
● the network of high-throughput and high coverage rate;
● high data fidelity and high scalability network;
● the network of low-power consumption and high user capacity;
● be easy to dispose, safeguard simple network
The WiMin system is made up of three category node equipment: the WAT that accesses terminal, access center WAC and gateway.
1) (WAT) accesses terminal: be installed on each user data collection point, link to each other with the user's data collecting device, constitute the infrastructure device that the data acquisition in the WiMin system inserts, the access center (WAC) of being responsible for the user data that collects is passed to appointment.
In the WiMin system WAT not only can be directly with covering radius in WAC communicate by letter; Also has the data forwarding function simultaneously; Can be that its adjacent WAT transmits data, a plurality of WAT are formed into the multi-hop communication link of WAC according to the self-organizing network routing policy, have increased the coverage of network greatly.
2) access center (WAC): be installed on the user's data treatment facility, be formed in the data center's access point in certain geographical regional extent, be responsible for receiving the user data that the WAT that accesses terminal all in the one's respective area sends, to carry out subsequent treatment.The function class of WAC is similar to base station or the AP among the WLAN in the Cellular Networks; Be responsible for collecting the data that all collecting units are gathered in the microcellulor zone; For the situation of the data processing center in a plurality of sub-districts, can also accomplish of the forwarding of the interior data in zone simultaneously through appropriate configurations to data processing centre.
3) gateway: be installed on the user's data treatment facility, in higher primary network station, its descending connection WAC, up connection data center constitutes the gateway of whole network.
In the WiMin system, WAC and WAT interconnect with user's data collecting device, data processing equipment, and co-ordination constitutes complete data acquisition connecting system jointly.Therefore, the WiMin system is actually a communication middleware.The user's data collecting device is given WAT with the data that collect and is sent, and WAC receives the data that WAT sends, and gives the user data treatment facility again and carries out subsequent treatment.
(2) key technology that relates to:
The WiMin data insertion system " key technology mainly be " wireless network layer technology " and " the wireless channel layer is technological ".
1) wireless network layer technology:
The wireless network layer technology mainly comprises: " dynamic address generating algorithm ", " network degeneration algorithm ", " network is from maintenance algorithm " these 3 algorithms.
2) wireless channel layer technology
Mainly be to use the WOP sweep frequency technique; To call out with the separate communication pattern of transmission frequency and make shared model into; Be that calling frequency and transfer of data frequency all are identical frequency process, make system group network algorithm difficulty decrease, and the rapid alignment process of communication frequency simplified relatively.The slow frequency hopping pattern that the multiple spot of WiMin employing simultaneously frequency is regularly changed is guaranteed the data security transmission of WiMin system.
In the link establishment process, use single frequency hopping pattern pattern.The frequency hopping mode is used to exhale slowly and is swept principle soon, and promptly calling out frequency hopping rate is 1/2 sweep rate.Help the quick foundation of communication link like this.For mating this frequency sweep principle, the frequency sweep mode in intercepting the calling frequency range is used the algorithm of two-way flyback, can effectively solve like this with figure to hide problem with jumping fast covering.
(3) key issue that mainly solves:
Traditional wireless communication technology; Owing to existing the contradiction that much is difficult to overcome to make application be very limited; Such as the contradiction of the network coverage and transmission range, transmit the contradiction of reliable and autgmentability, the contradiction of low-power consumption and user capacity; In the WiMin system, these problems have obtained being close to perfectly and have solved.
1) network of high-throughput and high coverage rate
Generally speaking, wireless telecommunications will obtain high data throughput, just need to adopt higher carrier frequency and data bandwidth; Yet the penetration capacity of high-frequency signal and antidamping ability all are lower than low-frequency band and low data bandwidth signal, and the transmission range of signal will shorten, and will sacrifice the covering radius of network so to a certain extent.Generally, 2.4G Hz wireless network (such as ZigBee) adopts 250K Hz or higher data bandwidth to obtain high network throughput; Most 433M Hz wireless transparent transport modules have adopted the data bandwidth of 9.6/4.8/2.4/1.2KHz to obtain bigger network coverage area, and data bandwidth and network coverage radius are a pair of contradiction all the time.The WiMin wireless network runs on the data-modulated bandwidth of 38.4KHz; Take less fixed length message at link layer; Use sub-packet aggregation in transport layer, message buffering, mechanism such as batch affirmation; When having guaranteed the high network coverage, also obtained high data throughput, good support is provided the data service of high real-time.
2) high data fidelity and high scalability network
For a wireless network, extensibility is an important characteristic.In order to set up a fairly large wireless network, typical solution is the relay transmission.In the relay transmission; Each intermediate node can be transmitted message, and owing to the wireless reason such as interference that is subject to itself, message is lost easily in the process of repeatedly transmitting; Increased the broken probability that lacks of data; Simultaneously because wireless network has adopted the mode of intelligent route and multiple spot relay, transmitting terminal is comparatively difficult for the estimation of transmission delay, so just be difficult to realize one fast retransmission mechanism guarantee data reliability.WiMin has adopted the scheme that increases the base station to expand for network.Each base station works in different wireless frequencies, and independent operating does not disturb mutually each other, and the spoke subnet of a plurality of high coverings and high-fidelity is connected to data center through wired modes such as Ethernets, realizes the flexible expansion of wireless network.
3) network of low-power consumption and high user capacity
The WiMin wireless network is in order to obtain short network insertion time-delay; Child node has been carried out little group divides; Realized competing at the MAC layer with can not compete two kinds of time slots; Guarantee under the situation of high user capacity, will to compete the probability that lost efficacy and reduce to minimum, for multi-user's concurrent request provides equality, access mechanism fast.
To mobile computing network, the WiMin wireless module carries out dormancy to wireless module in real time and wakes the power consumption of reduction communication module up through receiving the DTR/DSR control of HPI.Less radio-frequency is closed under park mode, and protocol stack processor operates in 10KHz, and operating current is limited in below the 1mA, in the handheld device of paying attention to battery life, better performance is arranged.
4) be easy to dispose, safeguard simple network
The base station of WiMin wireless network and child node can load its configuration parameter automatically, then receive protocol-driven for state informations such as network distribution and communication objects.It disposes automatically with automatic learning ability and from the network operation of specialty, frees people, stops the base station and then closes wireless network, and the base station powers on and then recovers wireless network; For the change of wireless network, dilatation is disposed and operation maintenance also requires very low.
At present, wireless communication mode commonly used has: Zigbee, Wi-Fi and GSM/CDMA pattern.Wimin and other communication modes see table 1, table 2 and table 3 more respectively:
Table 1
Table 2
Table 3
The above only is a preferred implementation of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; Can also make some improvement and retouching, these improvement and retouching also should be looked protection scope of the present invention.
Claims (9)
1. a Distributive Data Acquisition and Control System is characterized in that, comprising: remote monitoring platform and an above wireless communication data collecting unit; Said remote monitoring platform is connected through the WiMin wireless network with each said wireless communication data collecting unit.
2. Distributive Data Acquisition and Control System according to claim 1 is characterized in that, each said wireless communication data collecting unit comprises: main control module, communication module and an above I/O module; Said main control module is connected with said I/O module with said communication module respectively.
3. Distributive Data Acquisition and Control System according to claim 2 is characterized in that, adopts the RS485 universal serial bus to be connected between said main control module and the said communication module; Adopt the RS485 universal serial bus to be connected between said main control module and each said I/O module.
4. Distributive Data Acquisition and Control System according to claim 2 is characterized in that, said main control module and said communication module constitute host node, and each said I/O module is from node; Said host node is said from node communication through point-to-point communication mode and each, and perhaps, said host node is said from node communication through broadcast communication mode and each.
5. Distributive Data Acquisition and Control System according to claim 2 is characterized in that, comprises 1-20 said I/O module in each said wireless communication data collecting unit.
6. Distributive Data Acquisition and Control System according to claim 1 is characterized in that, said WiMin wireless network has following characteristics:
(1) operating frequency of said WiMin wireless network is 480MHz～510MHz;
(2) said WiMin wireless network is supported 10 groups of multiplexing and frequency hoppings in frequency space of totally 20 frequencies, adopts the network organization mode of honeycomb;
(3) said WiMin wireless network is made up of a plurality of WiMin nodes, and the pattern field ground point-to-point communication distance of each said WiMin node is 500 meters;
(4) in the said WiMin wireless network, the wireless network layer technology comprises: dynamic address generating algorithm, network degeneration algorithm and network are from maintenance algorithm;
(5) said WiMin wireless network runs on the data-modulated bandwidth of 38.4KHz, uses sub-packet aggregation, message buffering and batch affirmation mechanism in transport layer;
(6) said WiMin wireless network adopts the scheme that increases the base station to expand for network; Wherein, each said base station works in the wireless frequency that has nothing in common with each other, and independent operating each other is connected to data center with the spoke subnet of a plurality of high coverings and high-fidelity through Ethernet;
(7) said WiMin wireless network has carried out group's division to each node, but the MAC layer adopt competition slot with can not competition slot.
7. the Distributive Data Acquisition and Control method of each said Distributive Data Acquisition and Control System of application rights requirement 1-6 is characterized in that, adopts the self-defined stipulations communication mode of question and answer mode between said main control module and each the said I/O module; Specifically may further comprise the steps:
Said main control module is configured each said I/O module;
The heating parameter of said I/O module acquiring heat supply system, and this heating parameter sent to said main control module;
Said main control module receives said heating parameter, said heating parameter is carried out analysis and judgement after, controlled amount, and said controlled quentity controlled variable sent to said I/O module;
Said I/O module is according to the running status of heating equipment in the said controlled quentity controlled variable control heating system.
8. Distributive Data Acquisition and Control method according to claim 7; It is characterized in that said I/O module is used for one or more in the acquiring heat supply system following parameters: boiler, once supply force value, temperature value, flow value and the calorie value of backwater with secondary.
9. Distributive Data Acquisition and Control method according to claim 7; It is characterized in that said I/O module is specially according to the running status of heating equipment in the said controlled quentity controlled variable control heating system: said I/O module is according to the operating condition of circulating pump, small pump and electrically operated valve in the said controlled quentity controlled variable control heating system.
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