HJ 212-2017 English PDF

HJ 212-2017: Data transmission standard for online monitoring systems of pollutant
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HJ 212-2017
HJ
ENVIRONMENTAL PROTECTION STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
Replacing HJ/T 212-2005
Data transmission standard for online
monitoring systems of pollutant
ISSUED ON. APRIL 24, 2017
IMPLEMENTED ON. MAY 01, 2017
Issued by. Ministry of Environmental Protection
Table of Contents
Foreword ... 3 
1 Scope ... 6 
2 Normative references ... 6 
3 Terms and definitions ... 6 
4 System structure ... 9 
5 Layer of protocol ... 11 
6 Communication protocol ... 12 
7 Communication method of online monitoring instrumentation and data
acquisition transmitter ... 30 
Appendix A (Normative) Cyclic redundancy check (CRC) algorithm ... 33 
Appendix B (Normative) Coding table of commonly used monitoring factors and
equipment information (expandable) ... 35 
Appendix C (Informative) Example of communication command as well as
example of split package and response mechanism ... 49 
Appendix D (Informative) Calculation method for main pollutants in monitoring
points of sewage and flue gas pollution sources ... 93 
Data transmission standard for online
monitoring systems of pollutant
1 Scope
This standard applies to the data transmission between the online monitoring
system of pollutants, the automatic monitoring system of the pollutant discharge
process (working conditions), and the monitoring center. It specifies the
transmission process as well as the format of parameter commands, interactive
commands, data commands, control commands; gives the definition of code.
This standard allows for expansion, but the expansion of content shall not
conflict with the control commands used or retained in this standard.
This standard also specifies the data transmission format between the online
monitoring instrumentation and the data acquisition transmitter, meanwhile
gives the definition of code.
2 Normative references
This standard refers to the following documents or their terms. For undated
references, the valid version applies to this standard.
GB 3096-2008 Environmental quality standard for noise
GB/T 16706-1996 Codes for environmental pollution source categories
GB/T 19582-2008 Modbus industrial automation network specification
HJ/T 75-2007 Specifications for continuous emissions monitoring of flue gas
emitted from stationary sources (on trial)
HJ/T 76-2007 Specification and test procedures for continuous emission
monitoring systems of flue gas emitted from stationary sources (on trial)
HJ 524-2009 Codes for air pollutants
HJ 525-2009 Codes for water pollutants
3 Terms and definitions
The following terms and definitions apply to this standard.
Process monitoring
According to the process design, the monitoring of key parameters (including
such processing parameters as flow rate, temperature, oxygen content,
pressure, etc., and such electrical parameters as current, voltage, frequency,
rotation speed, etc.) of the operation of production facilities and pollution
treatment facilities (hereinafter referred to as treatment facilities) that affect
discharge of pollutants; combined with the enterprise’s production process
and end monitoring data, comprehensively monitor the operation of the
production facilities and treatment facilities of the enterprise, pollutant
treatment effects and emissions, determine the rationality, authenticity,
acceptability of the monitoring data of the pollutant discharge, which is
named as the emission process (working conditions) monitoring in this
standard.
3.7
Clearance
The process of using clean water, water sample, chemical reagent, etc., to
clean and wash the sample injection pipeline and the main measurement
parts to ensure the accuracy of the measurement data, before the online
monitoring equipment tests the sample, which is called clearance.
3.8
Blowback
In the measurement process of online monitoring instrument, in order to
prevent the measurement results from being affected by the blocking or un-
smoothness of the measurement circuit, use high-pressure gas to
automatically and regularly purge the measurement circuit, so as to ensure
the smooth flow of the measurement circuit, which is called blowback.
3.9
Sampling for overproof
The process of triggering the automatic sampling equipment to collect
pollutant samples when the pollutants exceed the standard, which is called
sampling for overproof.
3.10
Zero calibration
The process of using the zero calibration solution as the specimen to perform
test, where the indicated value of the online monitoring instrument is
One of more of above communication media consists the transmission network
as referred to in this standard.
The application layer of this standard depends on the basic transmission layer.
The basic transmission layer uses the TCP/IP protocol (the TCP/IP protocol has
four layers, namely the network interface layer, the network layer, the
transmission layer, the application layer), the TCP/IP protocol is constructed in
the selected transmission network, which realizes the interface with the
transmission network through the network interface layer in the TCP/IP protocol.
The application layer in this standard substitutes the application layer (only use
three layers of it) in the TCP/IP protocol. The protocol of the entire application
layer is irrelevant to the specific transmission network. This standard is
irrelevant to the communication media.
6 Communication protocol
6.1 Answer mode
A complete command consists of the requester's initiation and the responder's
response. The specific steps are as follows.
1) The requester sends a request command to the responder;
2) After receiving the request, the responder sends a request response (the
handshake is completed) to the requester;
3) After receiving the request response, the requester waits for the responder
to respond to the execution result; if the requester does not receive the
request response, it is processed as overtime of request response;
4) The responder performs the request operation;
5) The responder sends the execution result to the requester;
6) The requester receives the execution result and the command is
completed; if the requester does not receive the execution result, it is
processed as overtime of execution.
6.2 Overtime retransmission mechanism
6.2.1 Overtime for request response
• If the response is not received within the specified time after a request
command is issued, it is considered as overtime;
• In case of retransmission after overtime, if the response is not received after
the retransmission exceeds the specified number, it is considered that the
Note. This field may not be available if the packet is not
split, it is related to the flag bit
Command
parameters CP Character 0 ≤ n ≤ 950
CP = and and data area and and , data area is as defined in clause
6.3.3
6.3.3 Data area
6.3.3.1 Structure definition
The field is concatenated with its value by “=”; in the data area, the different
classification values of the same item are separated by “,”, the different items
are separated by “;”.
6.3.3.2 Field definition
6.3.3.2.1 Field name
Field names are case sensitive, the first character of a word is uppercase, the
other parts are lowercase.
6.3.3.2.2 Data type
C4. It indicates a character string of up to 4 digits, it is based on the actual
number of digits if it is less than 4 digits;
N5. It indicates a character string of up to 5 digits, it is based on the actual
number of digits if it is less than 5 digits;
N14.2. A numeric representation expressed as a variable-length string, which
represents a 14-bit integer and a 2-digit fraction, with a decimal point, signed,
the maximum length is 18;
YYYY. Date year, for example, 2016 indicates the year 2016;
MM. Date month, for example, 09 indicates September;
DD. Date date, for example, 23 indicates 23rd;
hh. Time hour;
mm. Time minute;
ss. Time second;
zzz. Time milliseconds.
6.3.3.2.3 Field comparison
The field comparison is as shown in Table 4. The "width" in Table 4 only contains
Table 4 (continued)
Name of
field Descriptions
Character
set Width Value and description
NewPW New password
0 ~ 9 / a
~ z / A ~
C6
OverTime Overtime 0 ~ 9 N2 The unit is second, the value is 0 < n ≤ 99
ReCount Number of retransmissions 0 ~ 9 N2 The value is 0 < n ≤ 99
VaseNo Sampling bottle No. 0 ~ 9 N2 The value is 0 < n ≤ 99
CstartTime Sampling startup time of equipment 0 ~ 9 N6 hhmmss
Ctime Sampling cycle 0 ~ 9 N2 The unit is hour, the value is 0 < n ≤ 24
Stime Sampling time 0 ~ 9 N4 The unit is minute, the value is 0 < n ≤ 120
xxxxxx-Info Field information - --
“xxxxxx” is the field information code.
Refer to Table B.10 of Appendix B for
details
InfoId Field information code 0 ~ 9 / a ~ z C6
The value is as shown in Table B.10 of
Appendix B
xxxxxx-SN Online monitoring instrumentation coding
0 ~ 9/A ~
F C24
It consists of an EPC-96 code converted
string, consisting the 24 characters of 0 ~
9, A ~ F
Note. The (converted) real-time value of pollutants, the (converted) maximum value, the (converted)
minimum value, the (converted) average value, etc., determine the width of the uploaded characters
according to the actual pollutant monitoring range and accuracy, meanwhile the metering unit of the
(converted) real-time value of pollutants, the (converted) maximum value, the (converted) minimum
value, the (converted) average value shall be consistent.
6.4 Coding rules
There are three types of monitoring factors involved in this standard. The first
category is the pollutant factor, the second category is the condition monitoring
factor, the third category is the field information. The pollutant factor code is
defined by relevant national and industry standards GB 3096-2008, HJ 524-
2009, HJ 525-2009. The definition of the condition monitoring factor and the
field information coding are as shown in the following clauses.
6.4.1 Coding rules for working condition monitoring factor
The coding of condition monitoring factor consists of a six-digit fixed-length
alphanumeric hybrid format. The alphanumeric code is abbreviated, the
numeric code is represented by an Arabic numeral, using an incremental
numeric code.
6.6.1 System code (expandable)
It corresponds to the system code in Figure 4 “Data structure in communication
protocol”.
6.6.1.1 Division of categories
System code is divided into four categories, each category represents a system
type.
10 ~ 29 indicates the category of environmental quality;
30 ~ 49 indicates the category of environmental pollution source;
50 ~ 69 indicates the category of working conditions;
91 ~ 99 indicates the category of system interaction;
A0 ~ Z9 are used for expansion of unknown system code.
6.6.1.2 System coding method
The system code (as shown in Table 5) is represented by two characters with
values 0 ~ 9 and A ~ Z.
Table 5 -- System coding table (refer to GB/T 16706-1996)
System name System code Descriptions
Monitoring of surface water quality 21
Monitoring of air quality 22
Monitoring of acoustic environmental quality 23
Monitoring of groundwater quality 24
Monitoring of soil quality 25
Monitoring of seawater quality 26
Monitoring of volatile organic compound 27
Atmospheric pollution sources 31
Surface water environmental pollution sources 32
Groundwater environmental pollution sources 33
Marine environmental pollution sources 34
Soil environmental pollution sources 35
Acoustic environmental pollution sources 36
Vibration environmental pollution sources 37
Radioactive environmental pollution sources 38
Site dust fly pollution sources 39
Electromagnetic environmental pollution sources 41
Monitoring of flue gas emission process 51
Monitoring of sewage discharge process 52
3) Setting of real-time data reporting interval;
4) Setting of minute data reporting interval;
5) Setting whether the real-time data is reported or not;
6) Setting whether the operation status of the pollution treatment equipment
is reported or not.
7 Communication method of online monitoring
instrumentation and data acquisition transmitter
The online monitoring instrumentation and the data acquisition transmitter use
the RS-485 serial communication standard to realize data communication.
7.1 Electrical interface standards between online monitoring
instrumentation and the data acquisition transmitter
It is recommended that the online monitoring instrumentation and the data
acquisition transmitter adopt the two-wire system RS-485 interface. For the
electrical standard of the RS-485 interface, refer to the RS-485 industrial bus
standard.
The RS-485 interface of the on-line monitoring instrumentation and the data
acquisition transmitter shall clearly indicate the words “RS485+” and “RS485-’,
etc., to indicate the wiring method.
7.2 Serial communication standards between online monitoring
instrumentation and the data acquisition transmitter
7.2.1 Serial communication bus structure
The communication bus structure between the online monitoring
instrumentation and the data acquisition transmitter is single-master and multi-
slave, as shown in Figure 11.
Figure 11 -- RS485 bus system structure
7.2.2 Transmission protocol of serial communication
Data collector (master)
RS485 bus
Field monitoring instrument
(slave)
Field monitoring instrument
(slave)
Appendix A
(Normative)
Cyclic redundancy check (CRC) algorithm
The CRC check (cyclic redundancy check) is a method for checking the data
transmission error. This standard uses ANSI CRC16, which is shortly referred
to as CRC16.
The CRC16 code is calculated by the transmission equipment and added to the
data packet. The receiving equipment recalculates the CRC16 code of the
received data packet, compares it with the received CRC16 code. If the two
values are different, there is ...