CN106568892A - Multiple gas online detection system based on Internet, and method thereof - Google Patents
Multiple gas online detection system based on Internet, and method thereof Download PDFInfo
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Abstract
The present invention relates to a multiple gas online detection system based on Internet, and a method thereof. The multiple gas online detection system comprises a multiple gas detector, a distribution box and a data processing center platform, wherein the multiple gas detector comprises a housing, a guide rail 4, a main board 5, an installation plug 6, a signal converter 13, a carbon dioxide probe 7, a methane probe 8, a carbon monoxide probe 9, an oxygen probe 10, a temperature and humidity probe 12 and a network interface 11, the housing comprises a housing top part 1 and a housing bottom part 3, the housing top part 1 and the housing bottom part 3 are encapsulated through screws 2, the network interface 11 is connected to the main board 5 and the signal converter 13, the signal converter 13 is fixed on the guide rail 4, the multiple gas detector is externally connected to a POE switch in the distribution box, and the data processing center platform and the multiple gas detector perform data interaction by using TCP. According to the present invention, the multiple gas online detection system and the method are used for the Internet+, wherein the multiple gas detection functions are integrated on the one equipment, the equipment volume is small, the installation is convenient, the power is supplied through the POE, only one network wire is used for data transmission and power supply, and the parameters such as carbon monoxide, carbon dioxide, oxygen, methane, temperature, humidity and the like are detected in the 24-h manner.
Description
Technical field
The invention belongs to gas detection technology field, and in particular to a kind of multiple gases on-line checking system based on the Internet
System and method, are mainly used in the on-line checking of the small space such as subway and public tunnel poisonous and harmful or fuel gas.
Background technology
With greatly developing for Urban Construction in China, the construction in subway and public tunnel is like a raging fire.At present the whole nation has 28
Metro operation has been opened in individual city, separately there is 38 urban construction, and the construction in public tunnel is even more countless.Subway and public
The phenomenons such as tunnel construction generally existing space is little, air circulation is poor, dust noise is serious, each professional cross-operation, and
As tunnel digs into the safety that various harmful gass greatly threaten workmen, and may cause huge to project and city
Big destruction.
The gas detecting of subway and public tunnel, market mostly is single gas detecting instrument or individual soldier type equipment；Existing tunnel
Road four-in-one gas detector, is portable, can detect oxygen, carbon monoxide, hydrogen sulfide, fuel gas, by applying when using
Workman person carries, and is powered by charged lithium cells, and stand-by time is general 60 hours；Some need long-term real-time detection multiple gases
Occasion is not applied to.
The gas burst accident in the public tunnel in ground such as the subway tunnel construction of the ground such as Wuhan, Guangzhou and Shanxi, Xiamen, Hunan
There is generation, cause great casualties and property loss, the detection of hazardous gas real-time online is extremely urgent.
The content of the invention
It is contemplated that solving one of technical problem in Related Technical Issues to a certain extent.For secondary, the one of the present invention
Individual purpose is to provide one kind of multiple gas detectors, and the gas detector small volume is easy for installation, can access the Internet.
Further object is that a kind of multiple gases on-line detecting system based on the Internet is provided, using logical
News agreement is interacted with the data of multiple-gas detector, realizes the real-time online detection of multiple gases.
Third object of the present invention there are provided a kind of inspection of the multiple gases on-line detecting system based on the Internet
Survey method.
To reach above-mentioned purpose, one aspect of the present invention embodiment provides multiple-gas detector, the multiple-gas detector
Including：
Housing, the housing includes cover top portion and outer casing bottom, and the cover top portion and outer casing bottom are encapsulated by screw；
Mainboard, the mainboard is arranged in outer casing bottom；
Signal converter, the signal converter is arranged in outer casing bottom, and the signal converter is that Ethernet turns 485, institute
State signal converter and connect the mainboard；
Detection probe, the detection probe is natural diffuseness formula, and at least including one or two or more kinds, the detection probe is side by side
Installed in the side of outer casing bottom, the detection probe is linked into mainboard；
Network interface, the network interface is arranged on outer casing bottom side, the network interface connection mainboard and signal adapter.
According to the multiple-gas detector of inventive embodiments, also including guide rail, the guide rail is arranged in outer casing bottom, institute
State signal converter to be fixed on guide rail.
According to the multiple-gas detector of inventive embodiments, also including mounting ear, the mounting ear is L-shaped, is arranged on institute
Outer casing bottom back corner is stated, the mounting ear is used to adjust the angle installed；Pass through shell when multiple-gas detector is installed
The adjustable installing ear of bottom is fixed, adjustable installing ear can 360 ° rotation, can be adjusted according to site environment during installation
Section.
According to the multiple-gas detector of inventive embodiments, the detection probe is popped one's head in including carbon dioxide, methane is popped one's head in,
Carbon monoxide probe, oxygen probe, humiture probe.
According to the multiple-gas detector of inventive embodiments, the network interface is RJ45 interfaces, the RJ45 interfaces it is built-in with
Too net turns serial port module.
Multiple-gas detector small volume is easy for installation, and much smaller than market multiple gases comprehensive detection device, and main frame is anti-
Shield grade reaches IP65, probe degree of protection IP53, can be applicable to various environment.
To reach above-mentioned purpose, another aspect of the present invention embodiment is provided based on the multiple gases on-line checking system of the Internet
System, including：
Above-mentioned multiple-gas detector；
Distribution box, is provided with POE switches in the distribution box, the POE switches access network interface, the net mouth Give by netting twine
Mainboard is electric for 12v；
Data processing centre's platform, the multiple-gas detector is carried out data transmission by wireless bridge, with Data processing
Heart platform is communicated；Data processing centre's platform carries out data interaction with the multiple-gas detector using TCP.
Multiple gases on-line detecting system based on the Internet only needs cloth one by POE power supply for exchange, in-site installation
Netting twine works by being linked into RJ45 mouths.
To reach above-mentioned purpose, third aspect present invention embodiment is provided based on the multiple gases on-line checking system of the Internet
The detection method of system, step includes：The detection signal of detection probe accesses mainboard, mainboard data transfer to signal adapter, then
Network interface is transferred to from signal adapter, the POE switches of outside are uploaded data to, communications protocol is standard MODBUS agreement；Net
Mouthful docked with data processing centre platform.
According to the detection method of the multiple gases on-line detecting system based on the Internet of inventive embodiments, detection probe number
It is according to handling process：Carbon monoxide probe, carbon dioxide probe, oxygen probe, methane probe, humiture probe are connected to master
Plate, data are processed by mainboard；Agreement is self-defined multiparameter communications protocol, using the MODBUS-RTU communications association of standard
View, baud rate 9600bps, interface standard EIA/TIA-185, hardware connection RJ45 interfaces are carried out with data processing centre platform
Docking；Communication format：1 start bit, 8 data bit, low order is in front, no parity, 1 stop position, error detection
For cyclic redundancy check (CRC).
The detection method of the multiple gases on-line detecting system based on the Internet according to embodiments of the present invention, data processing
Central platform is received and carry out after data big data process, by reflection during fructufy on data processing centre's platform, related work
Personnel can check real time data by the Internet into data processing centre's platform, and protocol definition one-level is reported to the police and two grades
Alarm threshold value, after a certain gas reaches alarming value, platform will produce warning, remind supervisor.Simultaneously platform possesses
Condition Detection function, if equipment quits work can reflect on platform, facilitates personnel to be safeguarded.
According to the detection method of the multiple gases on-line detecting system based on the Internet of inventive embodiments, self-defined many ginsengs
Number communications protocol is as follows：
(1) main frame is to the form that slave sends data：Address, function code, register address, data, CRC low levels, CRC are low
Position；
Address：The address of correspondence child node, scope 1-247；
Function code：0x03 reads one or more depositors, and 0x06 writes a depositor；
Register address：AddrH represents the high byte address of the depositor to be read, and AddrL represents the low land of the depositor to be read
Location；
Data：The number of the data to be read of main frame, scope is from 1-16；
Last two byte is the high low byte of CRC check check code；
(2) slave is received after the data sent from main frame, and data are unpacked, as long as address matching, will enter to main frame
Row response；
Geocoding：The address (1-247) of slave；
Function code：0x03 reads one or more depositors, and 0x06 writes a depositor；
Byte number：Send the number of data, the i.e. byte number of data D0L-DNH；
Data：The data of main frame are sent to, number is equal to byte number；
Last two byte is the high low byte of CRC check check code；
(3) holding register address definition：Define by the concentration value of detected gas.
The beneficial of the present invention has the technical effect that：The present invention is various for subway and public tunnel construction and using design
Gas detector, belongs to a kind of natural diffuseness formula integrated gas detecting instrument of on-line checking, be applied to the Internet+, Duo Zhongqi
Detecting functions are integrated on an equipment, small volume (263*183*80mm/L*W*H), and easy for installation, POE powers, and only need one
Root netting twine is used for data transfer and power supply, whole day twenty four hours detection carbon monoxide, carbon dioxide, oxygen, methane, humiture
Etc. parameter.
The present invention is integrated with the online inspection of the multiple gases such as carbon monoxide, carbon dioxide, methane, oxygen and humiture
Survey, different from single gas detector or individual soldier's detection means on market, belong to on-line checking formula equipment.Believing without satellite
In the case of number, gas detection technology is applied to into the Internet and is added, big data analysis reaches real-time, efficient, safe purpose.
Present device small volume, easy for installation, detected gas species is more, and it is anti-that Main Engine Safeguard grade reaches IP65, probe
Shield grade reaches IP53, and can be used for several scenes carries out 24 hours on-line monitorings of whole day.
Description of the drawings
Fig. 1 is multiple-gas detector structure chart.
Fig. 2 is based on the multiple gases on-line detecting system figure of the Internet.
Fig. 3 is based on the multiple gases on-line detecting system detection method flow chart of the Internet.
In figure：1- cover top portions；2- screws；3- outer casing bottoms；4- guide rails；5- mainboards；6- mounting ears；7- carbon dioxide is visited
Head；8- methane is popped one's head in；9- carbon monoxides are popped one's head in；10- oxygen is popped one's head in；11- network interfaces；12- humitures are popped one's head in；13- signal converters.
Specific embodiment
The embodiment of the present invention is described below in detail, the example of the embodiment of the embodiment is shown in the drawings, wherein certainly
Begin to eventually same or similar label the element that represents or be similar to or the element with same or like function.Below with reference to
The embodiment of Description of Drawings is exemplary, it is intended to for explaining the present invention, and be not considered as limiting the invention.
The multiple-gas detector for proposing according to embodiments of the present invention is described with reference to the accompanying drawings, based on the various of the Internet
Gas on-line detecting system, and the detection method of the multiple gases on-line detecting system based on the Internet.
First, the multiple-gas detector of the embodiment of the present invention is illustrated.Fig. 1 is an enforcement of the invention
The structure chart of the multiple-gas detector of example.
As shown in figure 1, the multiple-gas detector include housing, guide rail 4, mainboard 5, mounting ear 6, signal adapter 13,
Carbon dioxide probe 7, methane probe 8, carbon monoxide probe 9, oxygen probe 10, humiture probe 12, network interface 11.Housing includes
Cover top portion 1 and outer casing bottom 3, cover top portion 1 and outer casing bottom 3 are encapsulated by screw 2.Carbon dioxide probe 7, methane probe
8th, carbon monoxide probe 9, oxygen probe 10, humiture probe 12 is mounted side by side on the side of outer casing bottom 3, and network interface 11 is RJ45
Interface, network interface 11 is arranged on outer casing bottom 3 and detection probe identical side, RJ45 interfaces connection mainboard 5 and signal adapter
13, signal adapter 13 is that Ethernet turns 485.Guide rail 4 is arranged in outer casing bottom 3, above mainboard 5, signal converter 13
It is fixed on guide rail 4.
Carbon monoxide probe 9 is the miniature infrared carbon dioxide sensor of photoelectricity, 0～1000ppm of range, arithmetic point 1；Point
Resolution 1ppm；One-level warning 150ppm；Secondary alarm 300ppm, 20～25s of response time.Functional characteristics：1st, NDIR
Technology (NDIR)；2nd, wide temperature compensation is repaid, good stability；3rd, diffusion type sampling, compact；4th, water resistant air dry immunity；5th, high precision,
Low-power consumption, long-life, maintenance are few；6th, digital-to-analog output signal.
Carbon dioxide probe 7 is carbon dioxide sensor, 0～5000ppm of range, arithmetic point 1；Resolution 1ppm；One
Level warning 1250ppm；Secondary alarm 2500ppm.Functional characteristics：1st, high sensitivity, high-resolution, low-power consumption；2nd, provide UART,
Various way of outputs such as analog voltage；3rd, response time is fast, water vapor is disturbed, not poisoned；4th, temperature-compensating, remarkable is linear defeated
Go out；5th, excellent stability, long service life.
Methane probe 8 is miniature infrared methane sensor, 0～10%VOL of range, arithmetic point 1；Resolution 0.1%
VOL；One-level warning 1%VOL；Secondary alarm 2.5%VOL.Functional characteristics：1st, using non-phenolic oxidative coupling reaction (NDIR)；2nd, temperature
Degree compensation, good stability；3rd, diffusion type sampling, compact；4th, water resistant air dry immunity is good；5th, high precision, low-power consumption, long-life
(>=10years), safeguard few；6th, digital-to-analog output signal is optional；7th, power supply supply/power consumption：DC 3.3-5.5v；Pmax
0.7w。
Oxygen probe 10,0～25%VOL of range, arithmetic point 1；Resolution 0.1%VOL；One-level warning 19.5%VOL；
Secondary alarm 23%VOL.Functional characteristics：1st, high sensitivity, resolution, low-power consumption；The 2nd, UART, analog voltage signal output are provided
Mode；3. high stability, stronger capacity of resisting disturbance.
Humiture probe 12, -20 DEG C of temperature range～125 DEG C；1 DEG C of resolution；- 20 DEG C of low alarm setting；High alarm setting 50
℃；0～100%RH of humidity range；Resolution 1%RH；Low alarm setting 15%RH；High alarm setting 99%RH.Functional characteristics：Precision
High, sensitivity is high, stability is high, genuine is demarcated, and from temperature and humidity compensation algorithm, can be applicable to high humidity environment, using RS485
Communication protocol, with CRC check, it is ensured that stable transmission.
Based on the multiple-gas detector of above-mentioned aspect, another aspect of the present invention embodiment is proposed based on the various of the Internet
Gas on-line detecting system, as shown in Fig. 2 including：Multiple-gas detector, distribution box, data processing centre's platform.
Multiple-gas detector is fixed when installing by the adjustable installing ear 6 of outer casing bottom 3, adjustable installing ear
Can 360 ° rotation, can be adjusted according to site environment during installation；Multiple-gas detector is by POE power supply for exchange, scene
Installation only needs piece netting twine of cloth to work by being linked into RJ45 mouths.
Multiple-gas detector is external to the POE switches in distribution box, and distribution box anti-deadlocks of built-in hard watchdog sets
It is standby；It is electric for 12v that POE switches access RJ45 interface ， Give mainboards 5 by netting twine；POE switches are again by wireless bridge (n to)
Carry out data transmission, communicated with data processing centre's platform of ground project management department.
Multiple-gas detector can remotely modifying device address, it is also possible to remote rehabilitation facility Default Value.Mould can be passed through
Block arrange program in data handling the heart platform multiple-gas detector is carried out it is remotely located.
Based on the multiple gases on-line detecting system based on the Internet of above-mentioned aspect, another aspect of the present invention embodiment is carried
Go out the detection method based on the multiple gases on-line detecting system of the Internet, detection method flow process is as shown in Figure 3；Step includes：
Carbon dioxide probe 7, methane probe 8, carbon monoxide probe 9, oxygen probe 10, humiture probe 12, detection signal access
Mainboard 5, the data transfer of mainboard 5 is transferred to RJ45 interfaces to signal adapter 13, then from signal adapter 13, uploads data to outer
The POE switches in portion, multiple-gas detector application layer adopt MODBUS-RTU communications protocol, data processing centre's platform with it is many
Plant gas detector carries out data interaction, data transfer reliability using TCP.；RJ45 interfaces are carried out with data processing centre platform
Docking, data processing centre's platform is received and carry out after data big data process, and reflection during fructufy is put down to data processing centre
On platform, relevant staff can check real time data by the Internet into data processing centre's platform.
In one embodiment of the invention, detection probe flow chart of data processing is：Carbon monoxide probe 9, carbon dioxide
Probe 7, oxygen probe 10, methane probe 8, humiture probe 12 is connected to mainboard 5, and data are processed by mainboard 5；Agreement is
Self-defined multiparameter communications protocol, using the MODBUS-RTU communications protocol of standard, baud rate 9600bps, interface standard EIA/
TIA-185, hardware connection RJ45 interfaces, is docked with data processing centre platform；Communication format：1 start bit, 8 numbers
According to position, low order is cyclic redundancy check (CRC) (CRC) in front, no parity, 1 stop position, error detection.
Further, self-defined multiparameter communications protocol is as follows.
1st, communication interface.
(1) interface standard：EIA/TIA-485 hardware connects：RJ45 interfaces.
(2) communication format：
A, 1 start bit
B, 8 data bit (low order is front)
C, no parity position
D, 1 stop position
Error detection (Error checking)：CRC (cyclic redundancy check (CRC)).
(3) communication speed：9600bps.
(4) communication modes：Client computer/server Modbus agreements；Modbus main websites/slave station EIA/TIA-485 or EIA/
TIA232。
2nd, with regard to host-host protocol：Host-host protocol refers to a series of independent data structures of data frame in and for passing
The limited rule of transmission of data.The transmission means mutually compatible with MODBUS rtu protocol modes is defined below.
(1) Modbus addresses rule：Modbus addressing spaces have 256 different addresses.Address 0 is left broadcast address.
All of node must recognize broadcast address, and host node does not have an address, only child node must have one on universal serial bus only
One address.The address realm that child node can be arranged is 1～247, and address 248～255 is system reservation.
3rd, file transformat.
(1) main frame sends form such as table 1
Table 1
Send the form of data to slave for main frame above：
Address：The address of correspondence child node, scope 1-247；
Function code：0x03 reads one or more depositors, and 0x06 writes a depositor；
Register address：AddrH represents the high byte address of the depositor to be read, and AddrL represents the low land of the depositor to be read
Location；Register address is discussed and refers to table 3 surely：Surely discuss holding register address；
Data：The number of the data to be read of main frame, scope is from 1-16；
Last two byte is the high low byte of CRC check check code；
For example：The reading of data is measured from the equipment that confidential location over the ground is 06, then sends data form as follows：
Main frame sends：06 03 00 06 00 02 25 BD.
(2) slave response form such as table 2
Table 2
| Address | Function code | Byte number | Data | CRC low levels | CRC is high-order |
| Address | Function | byte | D0L,D0H…DNL,DNH | CRCL | CRCH |
Slave is received after the data sent from main frame, and data are unpacked, as long as address matching, will ring to main frame
Should；
Geocoding：The address (1-247) of slave；
Function code：0x03 reads one or more depositors, and 0x06 writes a depositor；
Byte number：Send the number of data, the i.e. byte number of data D0L-DNH；
Data：The data of main frame are sent to, number is equal to byte number；
Last two byte is the high low byte of CRC check check code；
For example：The data response that slave is sent to above main frame is as follows：
Slave is responded：06 03 02 00 00 0D 84
It is 0 that the data of wherein the 4th the 5th receipt are the data measured by the present slave of 00 00 expressions, if measured data
For 99.68ppm, then the data for transmitting are 26 F0, i.e. decimal scale 9968.
(3) holding register address definition such as table 3
Table 3
Note：
1、O2Range：0～25%VOL；Resolution：0.1%VOL；Low alarm setting：19.5%VOL；High alarm setting：23%VOL；
2nd, CO ranges：0～1000ppm；Resolution：1ppm；One-level is reported to the police：150ppm；Secondary alarm：300ppm；
3、CH4Range：0～10%VOL；Resolution：0.1%VOL；One-level is reported to the police：1%VOL；Secondary alarm：2.5%VOL；
4、CO2Range：0～5000ppm；Resolution：1ppm；One-level is reported to the police：1250ppm；Secondary alarm：2500ppm；
5th, temperature range：- 20～+125 DEG C；Resolution：1℃；Low alarm setting：-20℃；High alarm setting：50℃；
6th, humidity range：0～100%RH；Resolution：1%RH；Low alarm setting：15%RH；High alarm setting：99%RH.
Address 0x0000 everybody definition is shown in Table 4
Table 4
Write register address definition and be shown in Table 5：
Table 5
| Address | Register information | Register information | Explanation | Remarks |
| 0x0000 | 0xA5,0X-- | Modification device address | 0x-- is amended address, | |
| 0x0001 | 0xA6,0x51 | Factory reset | Main frame receives 0xA6, after 0X51, factory reset | |
| 0x0002 | It is undefined | |||
| 0x0003 | It is undefined | |||
| 0x0004 | It is undefined | |||
| 0x0005 | It is undefined | |||
| 0x0006 | Retain |
The citing of modification device address：
Equipment of the device address for 0x01 is changed to into 0x02, is then sent：The 5B of 01 06 00 00 A5 02 73 can complete to set
Standby location location change, will remember new device address after the completion of change.
Factory reset is illustrated：
Equipment that will be to device address for 0x03 carries out factory reset, then send：The B4 of 03 06 00 01 A6 51 63 are
Can.
The uncertain view of data of other address writes, system retains, and facilitates subsequent expansion to use.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means to combine specific features, structure, material or spy that the embodiment or example are described
Point is contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term not
Identical embodiment or example must be directed to.And, the specific features of description, structure, material or feature can be with office
Combine in an appropriate manner in one or more embodiments or example.Additionally, in the case of not conflicting, the skill of this area
Art personnel can be tied the feature of the different embodiments or example described in this specification and different embodiments or example
Close and combine.
Although embodiments of the invention have been shown and described above, it is to be understood that above-described embodiment is example
Property, it is impossible to limitation of the present invention is interpreted as, one of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changes, replacing and modification.
Claims (10)
1. multiple-gas detector, it is characterised in that include：
Housing, the housing includes cover top portion (1) and outer casing bottom (3), and the cover top portion (1) and outer casing bottom (3) lead to
Cross screw (2) encapsulation；
Mainboard (5), the mainboard (5) is arranged in outer casing bottom (3)；
Signal converter (13), the signal converter (13) is arranged in outer casing bottom (3), and the signal converter (13) is
Ethernet turns 485, and the signal converter (13) connects the mainboard (5)；
Detection probe, the detection probe is natural diffuseness formula, and at least including one or two or more kinds, the detection probe is side by side
Installed in the side of outer casing bottom (3), the detection probe is linked into mainboard (5)；
Network interface (11), the network interface (11) is arranged on outer casing bottom (3) side, the network interface (11) connection mainboard (5) and signal
Transducer (13).
2. multiple-gas detector according to claim 1, it is characterised in that also including guide rail (4), the guide rail (4) sets
Put in outer casing bottom (3), the signal converter (13) is fixed on guide rail (4).
3. multiple-gas detector according to claim 1, it is characterised in that also including mounting ear (6), the mounting ear
(6) it is L-shaped, is arranged on the outer casing bottom (3) back corner, the angle that the mounting ear (6) is installed for regulation.
4. multiple-gas detector according to claim 1, it is characterised in that the detection probe includes that carbon dioxide is visited
Head (7), methane probe (8), carbon monoxide probe (9), oxygen probe (10), humiture probe (12).
5. multiple-gas detector according to claim 1, it is characterised in that the network interface (11) is RJ45 interfaces, described
RJ45 interface built-in ethernets turn serial port module.
6. the multiple gases on-line detecting system of the Internet is based on, it is characterised in that included：
The multiple-gas detector of any one of claim 1-5；
Distribution box, is provided with POE switches in the distribution box, the POE switches access network interface (11), the net by netting twine
(11) Give mainboards (5) are electric for 12v for mouth；
Data processing centre's platform, the multiple-gas detector is carried out data transmission by wireless bridge, with Data processing
Heart platform is communicated；Data processing centre's platform carries out data interaction with the multiple-gas detector using TCP.
7. using the detection method of the multiple gases on-line detecting system based on the Internet described in claim 6, its feature step
Suddenly include：The detection signal of detection probe accesses mainboard (5), mainboard (5) data transfer to signal adapter (13), then from signal
Transducer (13) is transferred to network interface (11), uploads data to the POE switches of outside, and communications protocol is standard MODBUS agreement；
Network interface (11) is docked with data processing centre platform.
8. the detection method of the multiple gases on-line detecting system based on the Internet according to claim 7, its feature exists
It is in detection probe flow chart of data processing：Carbon monoxide probe (9), carbon dioxide probe (7), oxygen probe (10), methane are visited
Head (8), humiture probe (12) are connected to mainboard (5), and data are processed by mainboard (5)；Agreement is logical for self-defined multiparameter
News agreement, using the MODBUS-RTU communications protocol of standard, baud rate 9600bps, interface standard EIA/TIA-185, hardware connects
RJ45 interfaces are connect, is docked with data processing centre platform；Communication format：1 start bit, 8 data bit, low order exists
Before, no parity, 1 stop position, error detection be cyclic redundancy check (CRC).
9. the detection method of the multiple gases on-line detecting system based on the Internet according to claim 7, its feature exists
Receive in data processing centre's platform and carry out after data big data process, by reflection during fructufy to data processing centre's platform
On, relevant staff can check real time data by the Internet into data processing centre's platform.
10. the detection method of the multiple gases on-line detecting system based on the Internet according to claim 8, its feature exists
It is as follows in self-defined multiparameter communications protocol：
(1) main frame is to the form that slave sends data：Address, function code, register address, data, CRC low levels, CRC are low
Position；
Address：The address of correspondence child node, scope 1-247；
Function code：0x03 reads one or more depositors, and 0x06 writes a depositor；
Register address：AddrH represents the high byte address of the depositor to be read, and AddrL represents the low land of the depositor to be read
Location；
Data：The number of the data to be read of main frame, scope is from 1-16；
Last two byte is the high low byte of CRC check check code；
(2) slave is received after the data sent from main frame, and data are unpacked, as long as address matching, will enter to main frame
Row response；
Geocoding：The address (1-247) of slave；
Function code：0x03 reads one or more depositors, and 0x06 writes a depositor；
Byte number：Send the number of data, the i.e. byte number of data D0L-DNH；
Data：The data of main frame are sent to, number is equal to byte number；
Last two byte is the high low byte of CRC check check code；
(3) holding register address definition：Define by the concentration value of detected gas.
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