CN108986323A - Pre-payment Internet of Things gas meter, flow meter with IC card - Google Patents
Pre-payment Internet of Things gas meter, flow meter with IC card Download PDFInfo
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- CN108986323A CN108986323A CN201810657392.7A CN201810657392A CN108986323A CN 108986323 A CN108986323 A CN 108986323A CN 201810657392 A CN201810657392 A CN 201810657392A CN 108986323 A CN108986323 A CN 108986323A
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07F—COIN-FREED OR LIKE APPARATUS
- G07F15/00—Coin-freed apparatus with meter-controlled dispensing of liquid, gas or electricity
- G07F15/06—Coin-freed apparatus with meter-controlled dispensing of liquid, gas or electricity with means for prepaying basic charges, e.g. rent for meters
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07F—COIN-FREED OR LIKE APPARATUS
- G07F15/00—Coin-freed apparatus with meter-controlled dispensing of liquid, gas or electricity
- G07F15/001—Coin-freed apparatus with meter-controlled dispensing of liquid, gas or electricity for gas
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- Beverage Vending Machines With Cups, And Gas Or Electricity Vending Machines (AREA)
- Management, Administration, Business Operations System, And Electronic Commerce (AREA)
Abstract
Pre-payment Internet of Things gas meter, flow meter with IC card, is related to gas meter, flow meter technical field, comprises the following modules: JTAG module, valve, memory module, NB-IOT module, processor module, counting module, LCD module, IC card module, battery module.It combines IC card and NB-IOT, guarantees also to can be realized and effectively supplement with money in the case where signal quality is bad, ensure that the normal use of user, can be realized to stay indoors and completes meter reading and payment, while providing convenience for gas company and gas user.
Description
Technical field:
The present invention relates to gas meter, flow meter technical fields, and in particular to the pre-payment Internet of Things gas meter, flow meter with IC card.
Background technique:
Gas meter, flow meter passes through the development of many years, at present there are many different types, at present using relatively broad main
There are following a few classes:
(1) stem-winder.This kind of table is one of the type used earliest, and manufacture craft is highly developed, and charging is more accurate, no
It needs to power using battery, but needs meter reader to visit and meter reading is carried out to user, bring inconvenience in practical applications.But
It is since its is cheap, the operation is stable, many cities are still largely using this kind of gas meter, flow meter at present.
(2) IC card table.This kind of table uses IC as supplementing medium with money.User holds to business hall and supplements with money, then goes home
It inserts the card into gas meter, flow meter, the amount of money or tolerance supplemented with money enter gas meter, flow meter.This kind of table can when with gas consumption to the greatest extent and
When close valve, avoid malicious overdraft, can adapt to the billing requirements of current ladder gas price.But since the table is mounted on user
In family, gas company is difficult to realize effective supervision to the table, cannot grasp the service condition of the table in time, it is difficult to avoid user
The problems such as to the malicious sabotage of the table.
(3) wireless meter.This kind of table is communicated using 433M wireless frequency, by building radio frequency network, is realized and is used
The data such as family recharge amount, tolerance issue in time.Gas company can carry out meter reading at any time daily, grasp the use of user in time
Situation.But there is the disadvantages of complicated deployment, poor anti jamming capability in the table of this type, there is situations such as losing in data transmission.
With the development of technology of Internet of things, the function of Internet of Things chip and application platform is constantly promoted, and technology of Internet of things obtains
To being more and more widely used, wherein being the Internet of Things chip of representative since low in energy consumption, stand-by time is long, data using NB-IOT
The features such as transmission reliability is high is particularly suitable for gas meter, flow meter application.Internet of Things gas meter, flow meter based on NB-IOT chip can be realized
Automatic data logging, the meter reading frequency of not registering one's residence remotely may be configured as interval 1 day or monthly copy 1 to n times, have preferable flexibility；It can
It realizes remote auto switch valve, avoids user because of the problems such as combustion gas arrearage, arrearage are paid up bring valve operation problem.Relative to
Traditional stem-winder, IC card table, the gas meter based on NB-IOT have a clear superiority.
But due to the installation environment of user complexity, there are certain dead angles, such as underground, corner by some place NB-IOT
Deng, especially current high-level structure, due to reinforced concrete structure complexity, cause inside building there are all multi signal dead angles,
NB-IOT signal is difficult to penetrate, and therefore, is difficult to meet the requirement of all standing using NB-IOT mode merely.
Summary of the invention:
Technical problem to be solved by the present invention lies in providing a kind of pre-payment Internet of Things gas meter, flow meter with IC card, it is by IC
Card and NB-IOT combine, and guarantee also to can be realized and effectively supplement with money, ensure that user's in the case where signal quality is bad
Normal use can be realized to stay indoors and complete meter reading and payment, while provide convenience for gas company and gas user.
Pre-payment Internet of Things gas meter, flow meter with IC card, by being formed with lower module:
(1) JTAG module: use is downloaded and debugged mainly for combustion gas table driven program；
(2) valve: the valve may be implemented remotely to control, gas company can remote switch valve, in the case where not arrearage,
User also can use button on table and carry out valve opening；
(3) memory module: mainly storage gas meter, flow meter control routine and business datum uses, and gas meter, flow meter can store complete 5
The history in a year uses data, can store most 6 grades of ladders gas price information；
(4) NB-IOT module: being the core communication module of gas meter, flow meter, realizes that gas meter, flow meter is surfed the Internet using the module, thus complete
At the data interaction with backstage Cloud Server, issuing for the data such as purchase gas tolerance, the amount of money, gas price is realized；
(5) processor module: being the kernel control module of gas meter, flow meter, coordinated control other devices, to realize gas meter, flow meter
It works normally；
(6) counting module: the module is mainly responsible for the tally function of user's gas consumption, and reading submits to processor module
Then backstage Cloud Server is uploaded to by NB-IOT module；
(7) LCD module: the module is used mainly for display relevant information, can show current residual gas to gas user
Amount, residual amount, every grade of surplus, valve state, the current year tire out the key messages such as gas consumption, gas meter, flow meter working condition code；
(8) IC card module: as effective supplement of NB-IOT module, in the situation that user installation environmental signal condition is poor
Under, user can be used IC card and supplement with money to business hall, then imported into charging information in gas meter, flow meter by plug-in card mode；
(9) battery module: power supply mainly is provided for system.Since this system is designed using low-power consumption mode,
Using 4 section standard dry cell batteries, it is ensured that at least work 3 years.
And the pre-payment Internet of Things gas meter, flow meter with IC card establishes connection by NB-IOT module and Cloud Server, and combustion gas is public
Department can be managed gas meter, flow meter by Cloud Server, and then realize inquiry meter reading and supplement with money etc. to table and operate.
Pre-payment Internet of Things gas meter, flow meter system with IC card, including following functions:
(1) remote reading: current residual amount, the current year can be added up usage amount, current battery charge, NB-IOT by gas meter, flow meter
The information reportings such as signal strength are to Cloud Server；
(2) remote valve control: Cloud Server can to gas meter, flow meter carry out remote switch valve, specifically have arrearage close valve, payment valve opening,
Because safety reasons temporarily close a variety of situations such as valve；
(3) recharging and paying: gas meter, flow meter can be realized by modes such as NB-IOT, IC card and be supplemented with money, and can by online business hall,
The number of ways such as entity business hall are handled under line；
(4) pattern switching: gas meter, flow meter can 3 kinds of operating modes such as direct-reading gage, pre-payment gas meter, pre-pay amount table it
Between free switching；
(5) warning reminding: Cloud Server insufficient, switch valve waiting time will issue prompting to user and disappear in gas meter, flow meter surplus
Breath, while in discovery table operation irregularity warning message will be sent to gas company administrator.
Wherein the basic procedure when user carries out online recharge is:
(1) user logs in the online business hall of this department by various ways such as computer, wechat public platforms；
(2) user utilizes the online business hall accounts of foundation such as combustion gas client agreement number, customer name, contact method；
(3) user inputs recharge amount or supplements tolerance with money, and online business hall should pay bill to user's generation is corresponding；
(4) user completes that the payment of bill should be paid in the way of Web bank, wechat payment, Alipay etc.；
(5) payment information of user is verified and stored in online business hall, and charging information is stored in cloud clothes after verification is errorless
It is engaged on device, waiting issues；
(6) gas meter, flow meter is interacted by NB-IOT module with Cloud Server, Cloud Server judge whether there is should under
The charging information of hair, if there is the information is then issued to gas meter, flow meter, gas meter, flow meter includes: with the opportunity that Cloud Server interacts
User supplements with money on long-pressing gas meter, flow meter table of going home after button；The fixation meter reading day of gas meter, flow meter monthly；
(7) gas meter, flow meter receives the charging information of Cloud Server, and it is legal to judge whether.If legal, by charging information
It is written in memory module, and successful to Cloud Server feedback operation.If illegal, abandon, and feeds back mistake to Cloud Server
Accidentally code；
(8) Cloud Server judges whether successful recharging, if it succeeds, under corresponding charging information is labeled as successfully
Hair；If feedback is error code, carries out error situation analysis and record；If gas meter, flow meter is not responded, handed in next time
It is retransmitted when mutually.
Cloud Server carries out gas meter, flow meter meter reading and carries out the basic procedure of remote valve door management:
(1) gas company administrator configures the fixation meter reading day of every piece of table by management backstage or reports interval number of days；
(2) after gas meter, flow meter reaches fixed meter reading day or reports number of days more than interval, by NB-IOT module to Cloud Server
The current service condition information of gas meter, flow meter is reported, such as current gas meter reading, the current year tire out gas consumption, remaining tolerance, battery
The information such as electricity, signal strength；
(3) the service condition information that Cloud Server reports gas meter, flow meter is stored in database；
(4) Cloud Server judges whether current gas table surplus is lower than prompting threshold value, if it is, reserved to user
Phone number or WeChat ID send payment reminder message；
(5) Cloud Server judges that current gas table using whether being more than facility extent, closes if it is, remotely sending valve
Instruction is closed, the phone number or WeChat ID closing gas meter valve, and reserving to user, which are sent, closes valve prompting；
(6) user completes payment by business hall under online or line；
(7) user's recharge amount is handed down to gas meter, flow meter by Cloud Server, while issuing opening valve command, after user's confirmation
I.e. openable valve.
Pre-payment Internet of Things gas meter, flow meter with IC card can work in 3 kinds of modes: direct-reading gage, pre-payment gas meter, pre-payment
Amount of money table, gas company can be by the operating mode of Cloud Server Remote configuration table, basic procedure:
(1) gas company administrator logs in Cloud Server and manages platform, and sets the operating mode of certain block table；
(2) gas meter, flow meter is interacted with Cloud Server, and Working mode set instruction is sent to gas meter, flow meter by Cloud Server；
(3) gas meter, flow meter is switched to assigned work mode according to the instruction that Cloud Server is sent, and feeds back and grasp to Cloud Server
Succeed.
Advantage possessed by the invention compared with prior art or good effect:
(1) hardware circuit is designed using low-power consumption, it is ensured that is at least worked 3 years；
(2) using NB-IOT as mainly supplement with money with meter reading channel, can be realized to stay indoors and complete meter reading and payment, together
When provide convenience for gas company and gas user, completed to cover in mainstream city in view of current NB-IOT, merely according to
Meter reading and successful recharging rate by NB-IOT is 95% or more；
(3) strong supplement of the IC card as NB-IOT is used, it is ensured that the letter covered is difficult in only a few NB-IOT
Number dead angle, user still are able to supplement this gas meter, flow meter with money；
(4) NB-IOT communication process uses high strength encrypting algorithm, and the data in communication process is avoided to be ravesdropping or distort；
(5) Cloud Server and gas meter, flow meter carry out validation verification to each item instruction is received, and avoid malicious instructions injection attacks
Influence；
(6) gas meter, flow meter can between 3 kinds of direct-reading gage, pre-payment gas meter, pre-pay amount table operating modes free switching, from
And it can satisfy the different charge demand of gas company；
(7) pre-pay amount table supports most 6 grades of chargings, can sufficiently meet current ladder gas price requirement.
Detailed description of the invention
Fig. 1 is the pre-payment Internet of Things gas meter, flow meter basic module composition schematic diagram with IC card.
Specific embodiment:
In order to be easy to understand the technical means, the creative features, the aims and the efficiencies achieved by the present invention, tie below
Specific attached drawing and example are closed, the present invention is further explained.
When normal use, setting for operating mode is carried out to the pre-payment Internet of Things gas meter, flow meter with IC card as needed first
Fixed, gas company can be by the operating mode of Cloud Server Remote configuration gas meter, flow meter, the pre-payment Internet of Things gas meter, flow meter with IC card
It can work under 3 kinds of direct-reading gage, pre-payment gas meter, pre-pay amount table modes, basic procedure is:
(1) gas company administrator logs in Cloud Server and manages platform, and sets the operating mode of certain block table；
(2) gas meter, flow meter is interacted with Cloud Server, and Working mode set instruction is sent to gas meter, flow meter by Cloud Server；
(3) gas meter, flow meter is switched to assigned work mode according to the instruction that Cloud Server is sent, and feeds back and grasp to Cloud Server
Succeed.
Embodiment 1:
The module of pre-payment Internet of Things gas meter, flow meter with IC card forms are as follows:
(1) JTAG module: use is downloaded and debugged mainly for combustion gas table driven program；
(2) valve: the valve may be implemented remotely to control, gas company can remote switch valve, in the case where not arrearage,
User also can use button on table and carry out valve opening；
(3) memory module: mainly storage gas meter, flow meter control routine and business datum uses, and gas meter, flow meter can store complete 5
The history in a year uses data, can store most 6 grades of ladders gas price information；
(4) NB-IOT module: being the core communication module of gas meter, flow meter, realizes that gas meter, flow meter is surfed the Internet using the module, thus complete
At the data interaction with backstage Cloud Server, issuing for the data such as purchase gas tolerance, the amount of money, gas price is realized；
(5) processor module: being the kernel control module of gas meter, flow meter, coordinated control other devices, to realize gas meter, flow meter
It works normally；
(6) counting module: the module is mainly responsible for the tally function of user's gas consumption, and reading submits to processor module
Then backstage Cloud Server is uploaded to by NB-IOT module；
(7) LCD module: the module is used mainly for display relevant information, can show current residual gas to gas user
Amount, residual amount, every grade of surplus, valve state, the current year tire out the key messages such as gas consumption, gas meter, flow meter working condition code；
(8) IC card module: as effective supplement of NB-IOT module, in the situation that user installation environmental signal condition is poor
Under, user can be used IC card and supplement with money to business hall, then imported into charging information in gas meter, flow meter by plug-in card mode；
(9) battery module: power supply mainly is provided for system.Since this system is designed using low-power consumption mode,
Using 4 section standard dry cell batteries, it is ensured that at least work 3 years；
The pre-payment Internet of Things gas meter, flow meter with IC card establishes connection by NB-IOT module and Cloud Server simultaneously, and combustion gas is public
Department can be managed gas meter, flow meter by Cloud Server, and then realize inquiry meter reading and supplement with money etc. to table and operate；
The pre-payment Internet of Things gas meter, flow meter system with IC card can be realized following functions above:
(1) remote reading: current residual amount, the current year can be added up usage amount, current battery charge, NB-IOT by gas meter, flow meter
The information reportings such as signal strength are to Cloud Server.
(2) remote valve control: Cloud Server can to gas meter, flow meter carry out remote switch valve, specifically have arrearage close valve, payment valve opening,
Because safety reasons temporarily close a variety of situations such as valve.
(3) recharging and paying: gas meter, flow meter can be realized by modes such as NB-IOT, IC card and be supplemented with money, and can by online business hall,
The number of ways such as entity business hall are handled under line.
(4) pattern switching: gas meter, flow meter can 3 kinds of operating modes such as direct-reading gage, pre-payment gas meter, pre-pay amount table it
Between free switching.
(5) warning reminding: Cloud Server insufficient, switch valve waiting time will issue prompting to user and disappear in gas meter, flow meter surplus
Breath, while in discovery table operation irregularity warning message will be sent to gas company administrator.
Embodiment 2:
Basic procedure when user carries out online recharge to the pre-payment Internet of Things gas meter, flow meter with IC card is:
(1) user logs in the online business hall of this department by various ways such as computer, wechat public platforms；
(2) user utilizes the online business hall accounts of foundation such as combustion gas client agreement number, customer name, contact method；
(3) user inputs recharge amount or supplements tolerance with money, and online business hall should pay bill to user's generation is corresponding；
(4) user completes that the payment of bill should be paid in the way of Web bank, wechat payment, Alipay etc.；
(5) payment information of user is verified and stored in online business hall, and charging information is stored in cloud clothes after verification is errorless
It is engaged on device, waiting issues；
(6) gas meter, flow meter is interacted by NB-IOT module with Cloud Server, Cloud Server judge whether there is should under
The charging information of hair, if there is the information is then issued to gas meter, flow meter, gas meter, flow meter includes: with the opportunity that Cloud Server interacts
User supplements with money on long-pressing gas meter, flow meter table of going home after button；The fixation meter reading day of gas meter, flow meter monthly；
(7) gas meter, flow meter receives the charging information of Cloud Server, and it is legal to judge whether, if legal, by charging information
It is written in memory module, and to the success of Cloud Server feedback operation, if illegally, abandoned, and feeds back mistake to Cloud Server
Accidentally code；
(8) Cloud Server judges whether successful recharging, if it succeeds, under corresponding charging information is labeled as successfully
Hair；If feedback is error code, carries out error situation analysis and record；If gas meter, flow meter is not responded, handed in next time
It is retransmitted when mutually.
Embodiment 3:
Cloud Server carries out meter reading to the pre-payment Internet of Things gas meter, flow meter with IC card and carries out the basic of remote valve door management
Process is:
(1) gas company administrator configures the fixation meter reading day of every piece of table by management backstage or reports interval number of days.
(2) after gas meter, flow meter reaches fixed meter reading day or reports number of days more than interval, by NB-IOT module to Cloud Server
The current service condition information of gas meter, flow meter is reported, such as current gas meter reading, the current year tire out gas consumption, remaining tolerance, battery
The information such as electricity, signal strength.
(3) the service condition information that Cloud Server reports gas meter, flow meter is stored in database.
(4) Cloud Server judges whether current gas table surplus is lower than prompting threshold value.If it is, reserved to user
Phone number or WeChat ID send payment reminder message.
(5) Cloud Server judges that current gas table using whether being more than facility extent, closes if it is, remotely sending valve
Instruction is closed, the phone number or WeChat ID closing gas meter valve, and reserving to user, which are sent, closes valve prompting.
(6) user completes payment by business hall under online or line.
(7) user's recharge amount is handed down to gas meter, flow meter by Cloud Server, while issuing opening valve command, after user's confirmation
I.e. openable valve.
The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (5)
1. the pre-payment Internet of Things gas meter, flow meter with IC card, it is characterised in that: comprise the following modules:
(1) JTAG module: use is downloaded and debugged for combustion gas table driven program；
(2) valve: the valve realizes long-range control, gas company can remote switch valve, in the case where not arrearage, user can also
To carry out valve opening using button on table；
(3) memory module: being that storage gas meter, flow meter control routine and business datum, gas meter, flow meter can store complete 5 annual history
Using data, most 6 grades of ladders gas price information can be stored；
(4) NB-IOT module: being the core communication module of gas meter, flow meter, using the module realize gas meter, flow meter surf the Internet, thus complete with
Issuing for the data such as purchase gas tolerance, the amount of money, gas price is realized in the data interaction of backstage Cloud Server；
(5) processor module: being the kernel control module of gas meter, flow meter, coordinated control other devices, to realize that gas meter, flow meter is normal
Work；
(6) counting module: the module is mainly responsible for the tally function of user's gas consumption, then reading submits to processor module
Backstage Cloud Server is uploaded to by NB-IOT module；
(7) LCD module: the module is used mainly for display relevant information, shows current residual tolerance, remaining gold to gas user
Volume, every grade of surplus, valve state, the current year tire out gas consumption, gas meter, flow meter working condition code key message；
(8) IC card module: as effective supplement of NB-IOT module, in the case where user installation environmental signal condition is poor,
User can be used IC card and supplement with money to business hall, then imported into charging information in gas meter, flow meter by plug-in card mode；
(9) battery module: being to provide power supply for system.
2. the pre-payment Internet of Things gas meter, flow meter with IC card, it is characterised in that: user is to the pre-payment Internet of Things gas meter, flow meter with IC card
Carry out the work operational process of online recharge are as follows:
(1) user logs in the online business hall of this department by computer, wechat public platform；
(2) user establishes online business hall account using combustion gas client agreement number, customer name, contact method；
(3) user inputs recharge amount or supplements tolerance with money, and online business hall should pay bill to user's generation is corresponding；
(4) user completes that the payment of bill should be paid in the way of Web bank, wechat payment, Alipay；
(5) payment information of user is verified and stored in online business hall, and charging information is stored in Cloud Server after verification is errorless
On, waiting issues；
(6) gas meter, flow meter is interacted by NB-IOT module with Cloud Server, and Cloud Server is judged whether there is and be issued
Charging information, if there is the information is then issued to gas meter, flow meter, the opportunity that gas meter, flow meter and Cloud Server interact includes: user
It supplements with money on long-pressing gas meter, flow meter table of going home after button；The fixation meter reading day of gas meter, flow meter monthly；
(7) gas meter, flow meter receives the charging information of Cloud Server, and it is legal to judge whether, if legal, charging information is written
Into memory module, and it is successful to Cloud Server feedback operation；If illegal, abandon, and to Cloud Server feedback error generation
Code；
(8) Cloud Server judges whether successful recharging, if it succeeds, corresponding charging information is labeled as successfully issuing；Such as
Fruit feedback is error code, then carries out error situation analysis and record；If gas meter, flow meter is not responded, next time interaction when into
Row retransmits.
3. the pre-payment Internet of Things gas meter, flow meter with IC card, it is characterised in that: Cloud Server fires the pre-payment Internet of Things with IC card
Gas meter carries out meter reading and carries out the operational process of remote valve door management are as follows:
(1) gas company administrator configures the fixation meter reading day of every piece of table by management backstage or reports interval number of days；
(2) it after gas meter, flow meter reaches fixed meter reading day or reports number of days more than interval, is reported by NB-IOT module to Cloud Server
The current service condition information of gas meter, flow meter；
(3) the service condition information that Cloud Server reports gas meter, flow meter is stored in database；
(4) Cloud Server judges whether current gas table surplus is lower than prompting threshold value, if it is, the mobile phone reserved to user
Number or WeChat ID send payment reminder message；
(5) Cloud Server judges that current gas table using whether being more than facility extent, refers to if it is, remotely sending valve closing
It enables, the phone number or WeChat ID closing gas meter valve, and reserving to user, which are sent, closes valve prompting；
(6) user completes payment by business hall under online or line；
(7) user's recharge amount is handed down to gas meter, flow meter by Cloud Server, while issuing opening valve command, after user's confirmation
Open valve.
4. the pre-payment Internet of Things gas meter, flow meter according to claim 1 with IC card, it is characterised in that: operating mode includes straight
Meter reading, pre-payment gas meter, pre-pay amount table.
5. the pre-payment Internet of Things gas meter, flow meter according to claim 1 with IC card, it is characterised in that: while with the pre- of IC card
Payment Internet of Things gas meter, flow meter establishes connection by NB-IOT module and Cloud Server, and gas company can be to combustion gas by Cloud Server
Table is managed, and then is realized inquiry meter reading and the operation such as supplemented with money to table.
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Cited By (6)
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| CN109448251A (en) * | 2018-12-29 | 2019-03-08 | 益阳中屹智能科技有限公司 | A kind of Intelligent gas meter based on internet of things |
| CN109741542A (en) * | 2019-01-25 | 2019-05-10 | 天津新科成套仪表有限公司 | Pre-payment control system in a kind of natural gas high pressure station |
| CN109886666A (en) * | 2019-02-28 | 2019-06-14 | 江苏源坤电子科技有限公司 | A kind of self-service culinary art fare payment system and its fee payment method based on NB-IoT |
| CN109920143A (en) * | 2019-03-29 | 2019-06-21 | 西安普瑞米特科技有限公司 | A kind of remote recharge system based on wechat barcode scanning |
| CN110207777A (en) * | 2019-07-02 | 2019-09-06 | 天津市裕民燃气表具有限公司 | A kind of Internet of Things gas meter, flow meter using NB-IOT equipment |
| CN110220563A (en) * | 2019-06-29 | 2019-09-10 | 天津市裕民燃气表具有限公司 | A kind of multifunctional internet of things gas meter, flow meter |
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