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CJ/T 188-2004: Technical requirements of utility meters data transmission
CJ/T 188-2004
URBAN-RURAL CONSTRUCTION INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
Technical requirements of utility meters data transmission
ISSUED ON: FEBRUARY 12, 2004
IMPLEMENTED ON: JUNE 01, 2004
Issued by: Ministry of Construction of PRC
Abolished
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terminology ... 5 
4 Basic requirements for data transmission ... 6 
5 Physical layer... 7 
6 Data-link layer ... 7 
7 Data security ... 11 
8 Application layer ... 12 
Appendix A (Normative) The composition and requirements of the automatic reading
system ... 22 
Appendix B (Informative) M-BUS interface ... 25 
Appendix C (Informative) RS-485 standard serial electrical interface ... 27 
Appendix D (Informative) Wireless transceiver interface ... 28 
Appendix E (Informative) Photoelectric transceiver interface ... 29 
Technical requirements of utility meters data transmission
1 Scope
This standard specifies the requirements for the basic principles, interface form,
physical performance, data link, data identification, data security, data expression
format of data transmission of household metering instruments (hereinafter referred to
as meters), including water meters, gas meters, heat meters.
This standard is applicable to the automatic meter 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 provisions in following documents become the provisions of this Standard through
reference in this Standard. For the dated references, the subsequent amendments
(excluding corrections) or revisions do not apply to this Standard; however, parties who
reach an agreement based on this Standard are encouraged to study if the latest versions
of these documents are applicable. For undated references, the latest edition of the
referenced document applies.
GB/T 778.1-1996 Measurement of water flow in closed conduits - Meters for cold
potable water - Part 1: Specifications
GB 4706.1 Safety of household and similar electrical appliances - Part 1: General
requirements
GB/T 6968-1997 Diaphragm gas meters
GB/T 17626.2 Electromagnetic compatibility - Testing and measurement techniques
- Electrostatic discharge immunity test
GB/T 17626.3 Electromagnetic compatibility - Testing and measurement techniques
- Radiated, radio-frequency, electromagnetic field immunity test
GB/T 15277 Information processing - Modes of operation for a 64-bit block cipher
algorithm
GB/T 17901.1 Information technology - Security techniques. Key management -
Part 1: Framework
CJ 128-2000 Heat meters
CJ/T 133-2000 IC card cold water meter
DL/T 698 Data acquisition and management system for electrical energy
3 Terminology
3.1
Automatic meter reading system
The system, by which the data of multiple household meters is read centrally by the
master station, through the transmission medium, referred to as the automatic meter
reading (AMR). The system is mainly composed of slave stations, physical channels,
master stations, etc.
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 handheld device, 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.
In this standard, it refers to household instruments.
3.4
Bus
A physical connection method of the system, that connects the master station AND
communicates with multiple slave stations in parallel.
3.5
Physical layer
It specifies the physical interface between the master station and the slave station,
as well as the physical and electrical characteristics of the interface. It is responsible
for the reception and transmission of information, on the physical medium.
3.6
Data-link layer
It specifies the composition of the information exchange frame, between the master
station and the slave station, the flow control of the information exchange, the
network protocol layer of error control, which is based on the physical layer.
3.7
Hand-held device
Portable device that can exchange data with data terminal device or household
meters.
4 Basic requirements for data transmission
4.1 General requirements
4.1.1 The automatic reading system shall have the ability to identify different types of
household instruments and two-way communication, in the same transmission medium.
4.1.2 The instruments, that constitute the slave station of the automatic reading system,
shall have a communication interface. The interface shall meet the requirements of the
relevant clauses of this standard.
4.1.3 The instruments, that constitute the slave station of the automatic reading system,
shall use a built-in battery. The normal service life of the battery shall be not less than
5 years, for the heat meter, OR not less than 6 years for the water meter and the gas
meter.
4.1.4 The household instrument shall have the output parameters of battery voltage
status and valve status (only for instruments, which have valve control function).
4.1.5 See Appendix A for the composition and requirements of the automatic reading
system.
4.2 Requirements for water meters
4.2.1 The accuracy of the water meter shall comply with the provisions of Chapter 5 of
GB/T 778.1-1996.
4.2.2 The output parameters of the water meter shall include the real-time time, the
accumulated volume on the settlement date, the accumulated volume on the current date.
4.2.3 The unit displayed by the water meter shall comply with the provisions of Clause
4.2.1.2 of GB/T 778.1-1996.
A.2.1.2 It shall be able to set initial parameters, such as time, key, etc.; there shall be
measures to prevent unauthorized personnel from operating.
A.2.1.3 It shall be able to realize system timing.
A.2.1.4 It shall be able to protect the recorded data, when the power is off; the data shall
not be lost after the power is restored.
A.2.1.5 It shall reserve the corresponding interface for uploading data.
A.2.2 The slave station only specifies functions, which are related to meter reading; for
other requirements, refer to relevant standards.
A.2.2.1 After receiving the reading information from the master station, it shall be able
to send the data, according to the transmission protocol, which is set in this standard.
A.2.2.2 It shall be able to receive the initial parameters, which are made by the master
station, such as the setting of time, key, etc.
A.2.2.3 It shall be able to output status parameters, such as battery status and other
parameters.
A.3 Technical requirements
A.3.1 The reliability of data transmission shall meet the following requirements.
1) One-time reading success rate: Calculate the one-time reading success rate, under
the test conditions, according to the following formula:
One-time reading success rate = The number of one-time successful readings / Total
number of successful readings × 100%
2) Under the test conditions, the index of one-time reading success rate is in
accordance with the provisions of Table A.1:
3) The reading of all data shall be accurate.
A.3.2 Electrical parameters shall meet the following requirements.
1) The electrical parameters of water meters and gas meters shall meet the
requirements in Table 2 of CJ/T 133-2000.
2) The electrical parameters of the heat meter shall meet the requirements of Clause
5.3.7 of CJ 128-2000.
A.3.3 The safety performance shall meet the following requirements.
1) The electrical safety requirements for water meters, gas meters, heat meters shall
comply with the provisions of GB 4706.1.
2) For the lightning resistance performance of the communication interface, it shall,
after subjected to 4000 V, 10/700 μs surge impact, be free from damage, after 5
positive and negative tests.
A.3.4 Electromagnetic compatibility shall meet the following requirements.
1) The radio frequency electromagnetic field’s radiation immunity shall be in
accordance with the provisions of GB/T 17626.3.
2) Electrostatic discharge immunity is in accordance with the provisions of GB/T
17626.2.
A.4 Test method
A.4.1 The test method of data transmission reliability shall be implemented, according
to the relevant clauses, which are specified in the standard DL/T 698.
A.4.2 The electrical parameter test of water meter and gas meter shall be carried out,
according to the relevant clauses, which are specified in the standard CJ/T 133.
A.4.3 The electrical safety performance test shall be carried out, in accordance with the
relevant clauses, which are specified in the standard GB 4706.1.
For the anti-shock performance, it shall, under the conditions required by the item 2 of
A.3.3 of this specification, carry out 5 positive and negative tests.
A.4.4 The radio frequency electromagnetic field’s radiation immunity test shall be
carried out, in accordance with the relevant clauses, which are specified in the standard
GB/T 17626.3.
Electrostatic discharge immunity test is carried out, according to the relevant clauses,
which are specified in the standard GB/T 17626.2.
Appendix B
(Informative)
M-BUS interface
B.1 The electrical interface shall meet the following requirements.
B.1.1 M-BUS shall be able to realize one master-slave or one-master-multiple-slave
communication, in the system.
B.1.2 The driving capacity shall be such that when the slave stations are powered by
the master station, each slave station obtains a current of not more than 2 mA. The
driving capacity of the master station shall not be less than 64 slave stations.
B.1.3 The connection method of the line has nothing to do with the topology.
B.1.4 The connection method of the line shall be non-polar.
B.2 The communication method adopts half-duplex protocol.
B.3 The transmission baud rate is 300 bps ~ 9600 bps.
B.4 The data transmission status of the M-BUS interface.
B.4.1 The schematic diagram of data transmission, from the master station to the slave
station, is as shown in Figure B.1.
B.4.1.1 Only one master station is allowed to be connected to the bus; the master station
must supply power to the bus, when it is working.
B.4.1.2 The master station shall transmit bit information, by means of level change.
B.4.1.3 The level of the slave terminal shall meet the following requirements.
1) In case of marking (the logic level is "1"): The bus voltage shall be 10 V greater
than bus voltage in case of marking; the bus voltage is less than or equal to 42 V.
2) In case of space (the logic level is "0"): The bus voltage shall be greater than 12
V.
B.4.2 The schematic diagram of data transmission, from the slave station to the master
station, is as shown in Figure B.2.
B.4.2.1 The slave station shall transmit information, through the change of current
magnitude.
Appendix C
(Informative)
RS-485 standard serial electrical interface
C.1 The RS-485 standard uses data transceiver of balanced transmission and differential
reception, to drive the bus.
C.2 Level requirements
C.2.1 Electrostatic discharge resistance (ESD) ± 15 kV (human body model) at the
driver and receiver end.
C.2.2 Common mode input voltage: -7 V ~ + 12 V.
C.2.3 Differential mode input voltage: Greater than 0.2 V.
C.2.4 Drive output voltage: At the load impedance of 54 Ω, the maximum is 5 V, the
minimum is 1.5 V.
C.3 Other requirements
C.3.1 Three-state output mode.
C.3.2 Half-duplex communication method.
C.3.3 The driving capacity shall not be less than 32 similar interfaces.
C.3.4 Under the condition that the transmission rate is not more than 100 kbps, the
effective transmission distance is not less than 1200 m.
C.3.5 The bus is passive AND is powered by the slave station or handheld device.