CN101581591A - Coal gas remote meter reading system - Google Patents
Coal gas remote meter reading system Download PDFInfo
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- CN101581591A CN101581591A CNA2008101917135A CN200810191713A CN101581591A CN 101581591 A CN101581591 A CN 101581591A CN A2008101917135 A CNA2008101917135 A CN A2008101917135A CN 200810191713 A CN200810191713 A CN 200810191713A CN 101581591 A CN101581591 A CN 101581591A
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Abstract
The invention discloses a coal gas remote meter reading system, which comprises a GSM main module and a collection flow meter instrument module EK, a collection flow meter instrument module CORUS, a PLC module and an isolated power supply module which are connected with the GSM main module, wherein the GSM main module encrypts based on a KEELOQ algorithm while performing GPRS/CDMA transmission, an instrument terminal needs to study with a host so as to communicate with the host, and in the studying process, the instrument terminal sends a serial number and an encryption key EN_KEY to the host, and the host generates a random number. The coal gas remote meter reading system has the advantages of adopting GPRS/CDMA to effectively perform remote transmission and using an encryption technique to successfully solve the problem of incomplete data packets in the process of the GPRS/CDMA transmission. Besides, the mode of power supply adopts power supply modules of an explosion-proof power supply and an intrinsically safe power supply module to flexibly satisfy on-site actual needs.
Description
Technical field
The present invention relates to a kind of coal gas remote meter reading system, a kind of specifically connection place of safety and explosive area equipment.
Background technology
The wireless frequency of operation of the general employing of present wireless automatic meter recording system is 433.92MHz, this frequency range of receiving is little, between the general 100-300m, native system adopts the GPRS/CDMA form, utilizes characteristics such as mobile communication and UNICOM's scope are wide, high-level efficiency to carry out teletransmission.The part system also adopts the GPRS/CDMA form to carry out teletransmission, but because in wireless transmission uncontinuity, server end can not be resolved incomplete data and be transmitted bag.In addition, other system all can not copy the data of flow correction instrument and control the free expansion of input and output (DI, DO, AI, AO) in the scene of solving, so far can not satisfy the requirement of combustion gas field control, does not have realization monitoring truly.
Long-distance meter-reading system commonly used mostly designs at the SCADA system, and its workflow and principle are as follows:
1, gather flowmeter instrument module (EK), gather flowmeter instrument module modules such as (CORUS) and obtain the data that the users such as pressure, temperature, operating mode flow, table condition flow of flowmeter need according to relevant flowmeter correction instrument agreement respectively by interfaces such as RS485, RS232, RS422.
2, small-sized PLC obtains on-the-spot input information (Di, Ai), by writing trapezoid figure program, effectively controls on-the-spot output information (Do, Ao).
3, the valid data of above-mentioned two steps acquisition send gsm module (master) to by the Modbus bus.
4, after gsm module (master) obtains the data of submodule by the Modbus bus, be uploaded to the SCADA computer system by the GPRS/CDMA wireless network through unique encryption (cryptographic algorithm that is fit to single-chip microcomputer) back.
5, after the SCADA computer system obtains the data of Gsm module (master),, be convenient to networking, realize bigger system through offer the SCADA system use of SCADA system own and other support OPC after deciphering, the data analysis with the form of OPC-server.
Above-mentioned kilowatt meter reading-out system exists the problem of data packet transmission error, company is registered one's residence check meter difficulty, meter reading efficiency is low, accuracy is not high.
Summary of the invention
The purpose of this invention is to provide a kind of coal gas remote meter reading system, solve the problem that kilowatt meter reading-out system commonly used exists the data packet transmission error, company is registered one's residence check meter difficulty, meter reading efficiency is low, accuracy is not high.
The objective of the invention is to be achieved through the following technical solutions:
A kind of coal gas remote meter reading system, comprise GSM primary module and the collection flowmeter instrument module EK that is connected with the GSM primary module, gather flowmeter instrument module CORUS, the PLC module, the insulating power supply module, the GSM primary module is connected with the SCADA computer system with the form of OPC-SERVER, when wherein the GSM primary module carries out the GPRS/CDMA transmission, encryption is based on the KEELOQ algorithm, the instrument end need could communicate with main frame through the study with main frame, the instrument end is sequence number SN in the process of study, encryption key EN_KEY give main frame, main frame produces random number, specifically adopts step:
A, instrument end are kept at sequence number SN, encryption key EN_KEY, 16 random numbers among the instrument end FLASH;
B, instrument end carry out verification to valid data, obtain 16 CSR[15:0], then 16 CSR[15:0] insert 16 CSR[31:16 at random] in, form 32 CSR[31:0];
C, with 64 encryption key EN_KEY[64:0] remove to encrypt 32 CSR[31:0] obtain 32 CRYP ciphertext;
D, host side obtain the data that the instrument end sends and carry out CRC check, and the algorithm of repeating step B obtains ciphertext and compares then, if do not have wrong then prove that the packet that the receiving instrument end sends is correct.
After the SCADA computer system obtains the data of gsm module,, be convenient to networking, realize bigger system through offer the SCADA system use of SCADA system own and other support OPC after deciphering, the data analysis with the form of OPC-SERVER.
The invention has the advantages that and adopted GPRS/CDMA effectively to carry out teletransmission, utilize the encryption technology success solution the situation of incomplete packet in the GPRS/CDMA communication process.In addition, utilize the data and the free expansion of input and output (DI, DO, AI, AO) of the successful solution collection in worksite correction instrument of modular design; Can provide good scheme for the combustion gas on-site supervision.Power supply mode adopts flame proof power supply and the dirigibility of intrinsic safety electric source module for power supply module to satisfy on-the-spot actual needs.
Description of drawings
With embodiment the present invention is described in further detail with reference to the accompanying drawings below.
Fig. 1 is the circuit structure block diagram of the coal gas remote meter reading system used always.
Embodiment
As shown in Figure 1, coal gas remote meter reading system disclosed by the invention, comprise GSM primary module and the collection flowmeter instrument module EK that is connected with the GSM primary module, collection flowmeter instrument module CORUS, PLC module, insulating power supply module, the GSM primary module is by the MODBUS bus and gather flowmeter instrument module EK, gather flowmeter instrument module CORUS, the PLC module is connected.The intrinsic safety electric source of described insulating power supply module is placed in Flameproof box inside, the GSM primary module is connected with the SCADA computer system with the form of OPC-SERVER, when wherein the GSM primary module carries out the GPRS/CDMA transmission, encryption is based on the KEELOQ algorithm, the instrument end need could communicate with main frame through the study with main frame, the instrument end is sequence number SN in the process of study, encryption key EN_KEY give main frame, main frame produces random number, main frame is provided with a slice EEPROM to each instrument end, in order to stores meter terminal sequence SN, encryption key EN_KEY and 16 random data.Specifically adopt step:
A, instrument end are kept at sequence number SN, encryption key EN_KEY, 16 random numbers among the instrument end FLASH;
B, instrument end carry out verification to valid data, obtain 16 CSR[15:0], then 16 CSR[15:0] insert 16 CSR[31:16 at random] in, form 32 CSR[31:0];
C, with 64 encryption key EN_KEY[64:0] remove to encrypt 32 CSR[31:0] obtain 32 CRYP ciphertext;
Encryption mechanism is: at first define a non-linear table, this non-linear table has 5 input NLF_IN[4:0], an output NLF_OUT.It is at CSR[31:0] in get equably at interval and fix 5: i0.i1.i2.i3.i4, by output code NLF_OUT of non-linear generation; This output code NLF_OUT again with EN_KEY in 15 .CSR in 2 carry out first output code CRYP[0 of output behind the XOR]; After one of every output, EN_KEY.CSR is shifted respectively, and EN_KEY makes ring shift, CRYP[0] as the input of CSR displacement; Repeat above-mentioned steps up to 32 CRYP[0:31 of output].Method according to this, even have only one to change among the check code CSR of 32bit, the data bit (16bit) that the CRYP ciphertext that obtains with the KEELOQ cryptographic algorithm also has more than 50% changes.
D, host side obtain the data that the instrument end sends and carry out CRC check, and the algorithm of repeating step B obtains ciphertext and compares then, if do not have wrong then prove that the packet that the receiving instrument end sends is correct.
After the SCADA computer system obtains the data of gsm module,, be convenient to networking, realize bigger system through offer the SCADA system use of SCADA system own and other support OPC after deciphering, the data analysis with the form of OPC-SERVER.
The invention has the advantages that and adopted GPRS/CDMA effectively to carry out teletransmission, utilization adds The solution of secret skill art success the situation of incomplete packet in the GPRS/CDMA communication process. In addition Utilize data and the input and output of the successful solution collection in worksite correction instrument of modular design outward, (DI, DO, AI, AO) free expansion; Can provide good scheme for the combustion gas on-site supervision. Power supply mode adopts flame proof power supply and the flexibility of intrinsic safety electric source module for power supply module to satisfy on-the-spot actual the need Want.
Claims (4)
1, a kind of coal gas remote meter reading system, comprise GSM primary module and the collection flowmeter instrument module EK that is connected with the GSM primary module, gather flowmeter instrument module CORUS, the PLC module, the insulating power supply module, the GSM primary module is connected with the SCADA computer system with the form of OPC-SERVER, when wherein the GSM primary module carries out the GPRS/CDMA transmission, encryption is based on the KEELOQ algorithm, the instrument end need could communicate with main frame through the study with main frame, the instrument end is sequence number SN in the process of study, encryption key EN_KEY give main frame, main frame produces random number, it is characterized in that, specifically adopt step:
A, instrument end are kept at sequence number SN, encryption key EN_KEY, 16 random numbers among the instrument end FLASH;
B, instrument end carry out verification to valid data, obtain 16 CSR[15:0], then 16 CSR[15:0] insert 16 CSR[31:16 at random] in, form 32 CSR[31:0];
C, with 64 encryption key EN_KEY[64:0] remove to encrypt 32 CSR[31:0] obtain 32 CRYP ciphertext;
D, host side obtain the data that the instrument end sends and carry out CRC check, and the algorithm of repeating step B obtains ciphertext and compares then, if do not have wrong then prove that the packet that the receiving instrument end sends is correct.
2, coal gas remote meter reading system according to claim 1 is characterized in that, the GSM primary module is connected with collection flowmeter instrument module EK, collection flowmeter instrument module CORUS, PLC module by the MODBUS bus.
3, coal gas remote meter reading system according to claim 1 is characterized in that, main frame is provided with a slice EEPROM to each instrument end, in order to stores meter terminal sequence SN, encryption key EN_KEY and 16 random data.
4, coal gas remote meter reading system according to claim 1 is characterized in that, the intrinsic safety electric source of described insulating power supply module is placed in Flameproof box inside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101917135A CN101581591B (en) | 2008-12-30 | 2008-12-30 | Coal gas remote meter reading system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101917135A CN101581591B (en) | 2008-12-30 | 2008-12-30 | Coal gas remote meter reading system |
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| CN101581591A true CN101581591A (en) | 2009-11-18 |
| CN101581591B CN101581591B (en) | 2011-08-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2008101917135A Expired - Fee Related CN101581591B (en) | 2008-12-30 | 2008-12-30 | Coal gas remote meter reading system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013134927A1 (en) * | 2012-03-13 | 2013-09-19 | 华为终端有限公司 | Transport layer security-based key delivery method, smart meter reading terminal and server |
| CN103348696A (en) * | 2010-12-22 | 2013-10-09 | 纳格拉影像股份有限公司 | Safety facility metering monitoring module |
| CN105744515A (en) * | 2016-02-02 | 2016-07-06 | 无锡隆玛科技股份有限公司 | Wireless communication encryption method applied in data transmission of photovoltaic combiner box |
| CN112180826A (en) * | 2020-09-30 | 2021-01-05 | 苏州艾隆科技股份有限公司 | Operation and maintenance monitoring method and device and storage medium |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ITPC20030010A1 (en) * | 2003-03-06 | 2004-09-07 | A E M Gas Spa | MEASUREMENT AND CONTROL DEVICE |
| CN201032555Y (en) * | 2006-05-22 | 2008-03-05 | 苏州自来水表业有限公司 | Water supply pressure, metering wireless tester |
-
2008
- 2008-12-30 CN CN2008101917135A patent/CN101581591B/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103348696A (en) * | 2010-12-22 | 2013-10-09 | 纳格拉影像股份有限公司 | Safety facility metering monitoring module |
| US9395207B2 (en) | 2010-12-22 | 2016-07-19 | Nagravision S.A. | System and method to record encrypted content with access conditions |
| US9805367B2 (en) | 2010-12-22 | 2017-10-31 | Nagravision S.A. | System and method to record encrypted content with access conditions |
| WO2013134927A1 (en) * | 2012-03-13 | 2013-09-19 | 华为终端有限公司 | Transport layer security-based key delivery method, smart meter reading terminal and server |
| CN105744515A (en) * | 2016-02-02 | 2016-07-06 | 无锡隆玛科技股份有限公司 | Wireless communication encryption method applied in data transmission of photovoltaic combiner box |
| CN112180826A (en) * | 2020-09-30 | 2021-01-05 | 苏州艾隆科技股份有限公司 | Operation and maintenance monitoring method and device and storage medium |
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| Publication number | Publication date |
|---|---|
| CN101581591B (en) | 2011-08-31 |
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