CJ/T 188-2018 PDF English
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Technical requirements of utility meters data transmission
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CJ/T 188-2018: Technical requirements of utility meters data transmission---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/CJT188-2018
URBAN-RURAL CONSTRUCTION INDUSTRY STANDARD
ICS 35.240.99
L 78
Replacing CJ/T 188-2004
Technical requirements of utility meters data transmission
Issued on. MARCH 08, 2018
Implemented on. OCTOBER 01, 2018
Issued by. Ministry of Housing and Urban-Rural Development of PRC
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Terms and definitions... 6
4 Functional requirements... 7
5 Physical layer... 10
6 Data-link layer... 10
7 Data security... 15
8 Application layer... 17
1 Scope
This standard specifies the functional requirements, physical layer, data link layer, data
security, application layer for data transmission of household metering instruments
(hereinafter referred to as meters).
This standard is applicable to the automatic reading system, for data exchange between
the master station and the slave station, one master and one slave, or one master and
multiple slaves.
2 Normative references
The following documents are essential to the application of this document. For the dated
documents, only the versions with the dates indicated are applicable to this document;
for the undated documents, only the latest version (including all the amendments) is
applicable to this standard.
GB/T 778.1 Measurement of water flow in fully charged closed conduits - Meters
for cold potable water and hot water - Part 1.Specifications
GB/T 6968 Diaphragm gas meters
GB/T 19582.1 Modbus industrial automation network specification - Part 1.
Modbus application protocol
GB/T 19897.1-2005 Automatic meter reading system lower layer communication
protocol - Part 1.direct local data exchange
GB/T 26831.2 Society energy metering for reading system specification - Part 2.
Physical and link layer
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Automatic meter reading system
The system, by which the data of multiple slave stations is read automatically by the
master station, through the physical channel, referred to as the automatic meter
reading (AMR).
3.2
Master station
A device that selects one, a group or all of the slave stations AND initiates an
information exchange with the slave stations. It can be a concentrator, a handheld
device, a computer, or other data terminal.
3.3
Slave station
A device, that has a unique identification address in the entire network, receives
information from the master station, exchanges information with the master station.
Note. In this standard, it refers to instrument.
3.4
Bus
A physical cline, that connects the master station with multiple slave stations.
4 Functional requirements
4.1 General requirements
4.1.1 The automatic meter reading system shall have the ability to identify different
types of slave stations and two-way communication.
4.2 Function of master station
4.2.1 It shall be able to automatically read and receive the data of each slave station,
according to the set time; have the functions of real-time random reading and selective
reading by address.
4.2.2 It shall be able to set the initial parameters of the master station, such as time, etc.;
there shall be measures to prevent unauthorized personnel from operating.
4.2.3 It shall be able to realize the time calibration of the slave station system.
4.3 Function of slave station
4.3.1 It shall be able to receive and respond to the master station’s reading information.
4.4 Data transmission reliability
4.4.1 The one-time reading success rate is calculated, according to formula (1).
4.5 Meters
4.5.1 The accuracy of the water meter shall comply with the relevant provisions of
GB/T 778.1.
4.5.2 The output parameters of the water meter shall include the current cumulative
4.5.6 The output parameters of the heat (cold) meter shall include real-time time,
heating (cooling) volume on settlement day, current heating (cooling) volume, thermal
power, instantaneous flow, cumulative flow, water supply temperature, return water
temperature, cumulative working time, etc.
5 Physical layer
5.1 Interface form
Instrument communication interfaces include M-Bus interface, RS-485 interface,
wireless transceiver interface, optical interface. When using other interfaces, it shall
comply with the provisions of relevant standards.
5.4 Wireless transceiver interface
The radio frequency, which is used by the wireless transceiver interface, is preferably
the 433 MHz frequency band, the 470MHz frequency band, the 780 MHz frequency
band or the 868 MHz frequency band. Transmission power and other main technical
indicators shall comply with relevant national requirements.
5.5 Optical interface
6 Data-link layer
6.1 Protocol communication method
This protocol adopts the half-duplex communication mode of master-slave structure.
6.3 Frame format
6.3.1 The frame format shall comply with the provisions of Table 2.
6.3.4 The format of the control code (C) is as shown in Figure 3.
6.3.6 The data field (DATA) includes data identification, serial number, data; its
structure changes with the function of the control code.
6.3.7 The check code (CS) is one byte; all bytes, from the frame start character
(including the frame start character) to the check code, are accumulated in binary
arithmetic, excluding the overflow value which exceeds FFH.
6.4 Transmission requirements
6.4.1 Preamble byte. When using wired interface, 2 bytes ~ 4 bytes FEH shall be sent,
before sending frame information.
6.4.4 Error control. If the receiver detects a checksum, even check bit or format error,
it shall abandon the information frame and not respond.
6.4.5 Transmission rate. The commonly used rates are 300 bps, 600 bps, 1200 bps, 2400
bps, 4800 bps, 9600 bps.
7 Data security
7.1 Security requirements
It shall comply with the relevant provisions of the national password management.
7.2 Cryptographic algorithms
7.3 Key management
The 16-byte key is defined and managed by the vendor and the user. The key
management shall be secure and reliable.
7.4 Data padding
7.4.1 The plaintext data area to be encrypted is the part of the data field (DATA), after
removing the data identification DI and the serial number SER. Before data encryption,
data padding shall be performed first.
7.5 Data encryption
7.5.1 The padded data is encrypted according to the SM4 encryption algorithm. After
the encryption is completed, replace the content of the data field of the frame; modify
the data length field and check code to the correct value.
7.6 Data decryption
7.6.1 After receiving the data, the decryption operation shall be performed, according
to the SM4 cipher algorithm, which is specified in GM/T 0002-2012.
7.6.2 After the data decryption is completed, the padding content is removed, the
original data is restored for data processing.
8 Application layer
8.1 Read operation
8.1.4 The function of the slave station’s abnormal response frame is that the slave
station receives the response of the error control code.
8.2 Write operation
8.2.1 During write operation, the serial number SER, which is sent by the master station,
is incremented by 1 (modulo 256), before each communication. The response serial
number of the slave station shall be the same as the serial number, which is sent by the
master station.
8.2.3 The function of the normal response frame of the slave station is to inform the
master station of the execution result of the request command.
8.2.5 The coding format of the master station’s request for write operation shall comply
with the provisions of Table 15.
CJ/T 188-2018
URBAN-RURAL CONSTRUCTION INDUSTRY STANDARD
ICS 35.240.99
L 78
Replacing CJ/T 188-2004
Technical requirements of utility meters data transmission
Issued on. MARCH 08, 2018
Implemented on. OCTOBER 01, 2018
Issued by. Ministry of Housing and Urban-Rural Development of PRC
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Terms and definitions... 6
4 Functional requirements... 7
5 Physical layer... 10
6 Data-link layer... 10
7 Data security... 15
8 Application layer... 17
1 Scope
This standard specifies the functional requirements, physical layer, data link layer, data
security, application layer for data transmission of household metering instruments
(hereinafter referred to as meters).
This standard is applicable to the automatic reading system, for data exchange between
the master station and the slave station, one master and one slave, or one master and
multiple slaves.
2 Normative references
The following documents are essential to the application of this document. For the dated
documents, only the versions with the dates indicated are applicable to this document;
for the undated documents, only the latest version (including all the amendments) is
applicable to this standard.
GB/T 778.1 Measurement of water flow in fully charged closed conduits - Meters
for cold potable water and hot water - Part 1.Specifications
GB/T 6968 Diaphragm gas meters
GB/T 19582.1 Modbus industrial automation network specification - Part 1.
Modbus application protocol
GB/T 19897.1-2005 Automatic meter reading system lower layer communication
protocol - Part 1.direct local data exchange
GB/T 26831.2 Society energy metering for reading system specification - Part 2.
Physical and link layer
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Automatic meter reading system
The system, by which the data of multiple slave stations is read automatically by the
master station, through the physical channel, referred to as the automatic meter
reading (AMR).
3.2
Master station
A device that selects one, a group or all of the slave stations AND initiates an
information exchange with the slave stations. It can be a concentrator, a handheld
device, a computer, or other data terminal.
3.3
Slave station
A device, that has a unique identification address in the entire network, receives
information from the master station, exchanges information with the master station.
Note. In this standard, it refers to instrument.
3.4
Bus
A physical cline, that connects the master station with multiple slave stations.
4 Functional requirements
4.1 General requirements
4.1.1 The automatic meter reading system shall have the ability to identify different
types of slave stations and two-way communication.
4.2 Function of master station
4.2.1 It shall be able to automatically read and receive the data of each slave station,
according to the set time; have the functions of real-time random reading and selective
reading by address.
4.2.2 It shall be able to set the initial parameters of the master station, such as time, etc.;
there shall be measures to prevent unauthorized personnel from operating.
4.2.3 It shall be able to realize the time calibration of the slave station system.
4.3 Function of slave station
4.3.1 It shall be able to receive and respond to the master station’s reading information.
4.4 Data transmission reliability
4.4.1 The one-time reading success rate is calculated, according to formula (1).
4.5 Meters
4.5.1 The accuracy of the water meter shall comply with the relevant provisions of
GB/T 778.1.
4.5.2 The output parameters of the water meter shall include the current cumulative
4.5.6 The output parameters of the heat (cold) meter shall include real-time time,
heating (cooling) volume on settlement day, current heating (cooling) volume, thermal
power, instantaneous flow, cumulative flow, water supply temperature, return water
temperature, cumulative working time, etc.
5 Physical layer
5.1 Interface form
Instrument communication interfaces include M-Bus interface, RS-485 interface,
wireless transceiver interface, optical interface. When using other interfaces, it shall
comply with the provisions of relevant standards.
5.4 Wireless transceiver interface
The radio frequency, which is used by the wireless transceiver interface, is preferably
the 433 MHz frequency band, the 470MHz frequency band, the 780 MHz frequency
band or the 868 MHz frequency band. Transmission power and other main technical
indicators shall comply with relevant national requirements.
5.5 Optical interface
6 Data-link layer
6.1 Protocol communication method
This protocol adopts the half-duplex communication mode of master-slave structure.
6.3 Frame format
6.3.1 The frame format shall comply with the provisions of Table 2.
6.3.4 The format of the control code (C) is as shown in Figure 3.
6.3.6 The data field (DATA) includes data identification, serial number, data; its
structure changes with the function of the control code.
6.3.7 The check code (CS) is one byte; all bytes, from the frame start character
(including the frame start character) to the check code, are accumulated in binary
arithmetic, excluding the overflow value which exceeds FFH.
6.4 Transmission requirements
6.4.1 Preamble byte. When using wired interface, 2 bytes ~ 4 bytes FEH shall be sent,
before sending frame information.
6.4.4 Error control. If the receiver detects a checksum, even check bit or format error,
it shall abandon the information frame and not respond.
6.4.5 Transmission rate. The commonly used rates are 300 bps, 600 bps, 1200 bps, 2400
bps, 4800 bps, 9600 bps.
7 Data security
7.1 Security requirements
It shall comply with the relevant provisions of the national password management.
7.2 Cryptographic algorithms
7.3 Key management
The 16-byte key is defined and managed by the vendor and the user. The key
management shall be secure and reliable.
7.4 Data padding
7.4.1 The plaintext data area to be encrypted is the part of the data field (DATA), after
removing the data identification DI and the serial number SER. Before data encryption,
data padding shall be performed first.
7.5 Data encryption
7.5.1 The padded data is encrypted according to the SM4 encryption algorithm. After
the encryption is completed, replace the content of the data field of the frame; modify
the data length field and check code to the correct value.
7.6 Data decryption
7.6.1 After receiving the data, the decryption operation shall be performed, according
to the SM4 cipher algorithm, which is specified in GM/T 0002-2012.
7.6.2 After the data decryption is completed, the padding content is removed, the
original data is restored for data processing.
8 Application layer
8.1 Read operation
8.1.4 The function of the slave station’s abnormal response frame is that the slave
station receives the response of the error control code.
8.2 Write operation
8.2.1 During write operation, the serial number SER, which is sent by the master station,
is incremented by 1 (modulo 256), before each communication. The response serial
number of the slave station shall be the same as the serial number, which is sent by the
master station.
8.2.3 The function of the normal response frame of the slave station is to inform the
master station of the execution result of the request command.
8.2.5 The coding format of the master station’s request for write operation shall comply
with the provisions of Table 15.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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