CN110417764A - The method and apparatus for sending the method and apparatus of data and receiving data - Google Patents
The method and apparatus for sending the method and apparatus of data and receiving data Download PDFInfo
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- CN110417764A CN110417764A CN201910654214.3A CN201910654214A CN110417764A CN 110417764 A CN110417764 A CN 110417764A CN 201910654214 A CN201910654214 A CN 201910654214A CN 110417764 A CN110417764 A CN 110417764A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
- H04L67/104—Peer-to-peer [P2P] networks
- H04L67/1074—Peer-to-peer [P2P] networks for supporting data block transmission mechanisms
- H04L67/1078—Resource delivery mechanisms
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
- H04L69/163—In-band adaptation of TCP data exchange; In-band control procedures
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/22—Parsing or analysis of headers
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- Computer Security & Cryptography (AREA)
- Health & Medical Sciences (AREA)
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Abstract
The method and apparatus that embodiment of the present invention discloses the method and apparatus for sending data and receives data.This method is suitable for environment and equipment monitoring system (BAS), this method comprises: receiving the Modbus comprising register count from track traffic synthetic monitoring system (ISCS) reads message；It generates the Modbus comprising the first field, the second field and data field and replys message, length information determining based on the register count, from current byte byte to the end is written in first field, the data determined based on the register count are written in the data field, wherein when the register count is greater than the maximum register count that Modbus agreement is supported, predetermined mark is written in second field；The reply message is sent to the ISCS；Wherein when the ISCS detects the predetermined mark in second field, data are read from the data field based on the length information.The big quantity communication between BAS and ISCS may be implemented.
Description
Technical field
The present invention relates to technical field of rail traffic, more particularly to the method and apparatus for sending data and receive data
Method and apparatus.
Background technique
Environment and equipment monitoring system (Building Automatic System, BAS) is defined as: to metro building
Environment and air conditions, ventilation, plumbing, illumination, passenger's guiding, escalator and elevator, shield door, Flood gate in object etc.
The system that Architectural Equipment and system carry out centralized watch, control and management.BAS using computer network, automatic control, communication and
The technologies such as distributed intelligence realize the control management mode of metro environment and device systems, in subway station and running tunnel
The electromechanical equipments such as air conditioner ventilation, plumbing, illumination, electricity/staircase, safety door carry out comprehensive operational management and control.
Track traffic synthetic monitoring system (Integrated Supervisory Control System, ISCS) can be real
Now power equipment, fire alarm information and its equipment, station ring control equipment, section ring control equipment, environmental parameter, shield door are set
Standby, flood door equipment, Escalator equipment, lighting apparatus, access control equipment, automatic ticket inspection equipment, broadcast and closed circuit television equipment,
The basic function of the carry out such as the broadcast information of Customer information display system and clock information real-time centralized watch and control, can be with
It can also be achieved under night non-traffic-operating period, in the daytime in the case of normal operation, under urgent emergency case and important equipment fault condition
Under the Premium Features such as coordination and interaction between each related system equipment.
Currently, being typically based on Modbus TCP standard agreement between ISCS and BAS realizes communication.Modbus TCP standard agreement
Data are transmitted between ISCS and BAS using TCP/IP mechanism and Ethernet.
In current Modbus TCP standard agreement, the register count in message is indicated using a byte (byte)
Amount.However, a byte can only at most meet the communication of 125 registers, disposable big quantity transmission, Wu Faman can not achieve
Big quantity communication need between sufficient BAS and ISCS.
Summary of the invention
Embodiment of the present invention proposes the method and apparatus for sending data and the method and apparatus for receiving data, to realize
Big quantity communication between BAS and ISCS.
The technical solution of embodiment of the present invention is as follows:
The method for sending data, this method are suitable for BAS, this method comprises:
The Modbus comprising register count, which is received, from ISCS reads message；
It generates the Modbus comprising the first field, the second field and data field and replys message, in first field
Length information determining based on the register count, from current byte byte to the end is written, is write in the data field
Enter the data determined based on the register count, wherein when the register count is greater than the maximum deposit that Modbus agreement is supported
When device number, predetermined mark is written in second field；
The reply message is sent to the ISCS；
Wherein when the ISCS detects the predetermined mark in second field, based on the length information from
Data are read in the data field.
The byte number corresponding to register count is strictly written in the second field as it can be seen that being different from the prior art, in the present invention
In embodiment, when register count is greater than the maximum register count that Modbus agreement is supported, be not written in the second field
Corresponding to the byte number of register count, but predetermined mark is written in the second field, thus when ISCS is examined in the second field
When measuring predetermined mark, data are read from data field based on length information, realize mass data transmission.
In one embodiment, when the register count is less than or equal to the maximum register count that Modbus agreement is supported
When, write-in corresponds to the byte number of the register count in second field；
Wherein when the ISCS does not detect the predetermined mark in second field, it is based on the byte number
Data are read from the data field.
Therefore, when register count is less than or equal to the maximum register count that Modbus agreement is supported, BAS is still in the second field
Middle write-in corresponds to the byte number of register count, and ISCS is still based on the byte number in the second field and reads data, thus good simultaneous
Hold existing Modbus TCP standard agreement.
In one embodiment, it also includes initial address that the Modbus, which reads message,；
It is described in data field be written based on the register count determine data include:
With the initial address be reading initial position and the register count is to read register count, reads data；
Read data are written in the data field.
Therefore, Modbus, which is read in message, to include initial address, be well compatible with existing Modbus TCP standard
Agreement.
The device of data is sent, which is arranged in BAS, which includes:
Receiving module reads message for receiving the Modbus comprising register count from ISCS；
Generation module replys message for generating the Modbus comprising the first field, the second field and data field, in institute
It states and length information determining based on the register count, from current byte byte to the end is written in the first field, described
The data determined based on the register count are written in data field, wherein being propped up when the register count is greater than Modbus agreement
When the maximum register count held, predetermined mark is written in second field；
Sending module, for sending the reply message to the ISCS；
Wherein when the ISCS system detects the predetermined mark in second field, believed based on the length
Breath reads data from the data field.
The byte number corresponding to register count is strictly written in the second field as it can be seen that being different from the prior art, in the present invention
In embodiment, when register count is greater than the maximum register count that Modbus agreement is supported, be not written in the second field
Corresponding to the byte number of register count, but predetermined mark is written in the second field, thus when ISCS is examined in the second field
When measuring predetermined mark, data are read from data field based on length information, realize mass data transmission.
In one embodiment, the generation module is also used to be less than or equal to Modbus agreement when the register count
When the maximum register count supported, write-in corresponds to the byte number of the register count in second field；
Wherein when the ISCS does not detect the predetermined mark in second field, it is based on the byte number
Data are read from the data field.
Therefore, when register count is less than or equal to the maximum register count that Modbus agreement is supported, still in the second field
Write-in corresponds to the byte number of register count, and ISCS is still based on the byte number in the second field and reads data, to well be compatible with
Existing Modbus TCP standard agreement.
In one embodiment, it also includes initial address that the Modbus, which reads message,；
The generation module, for being that read initial position and the register count be to read deposit with the initial address
Device number reads data；Read data are written in the data field.
Therefore, Modbus, which is read in message, to include initial address, be well compatible with existing Modbus TCP standard
Agreement.
The method for receiving data, this method are suitable for BAS, this method comprises:
The Modbus comprising the first field, the second field and data field is received from ISCS, and message, first word is written
Section includes register count, and the data field includes data, wherein when the register count is greater than what Modbus agreement was supported
When maximum register count, second field includes predetermined mark, is propped up when the register count is less than or equal to Modbus agreement
When the maximum register count held, second field includes the byte number corresponding to the register count；
Based on the register count extracted from first field, data are obtained from the data field.
The byte number corresponding to register count is strictly written in the second field as it can be seen that being different from the prior art, in the present invention
In embodiment, when register count is greater than the maximum register count that Modbus agreement is supported, be not written in the second field
Corresponding to the byte number of register count, but predetermined mark is written in the second field, to well evade a byte-sized
Byte digital section for write-in data limitation.Moreover, BAS, which is not based on the second field, obtains data, but it is based on first
Register count in field obtains data, and mass data transmission may be implemented.
In one embodiment, the Modbus write-in message also includes initial address；This method further include:
With the initial address be write-in initial position and the register count is write-in register count, and write-in is described from number
According to the data obtained in field.
Therefore, Modbus, which is written in message, to include initial address, be well compatible with existing Modbus TCP standard
Agreement.
The device of data is received, which is arranged in BAS, which includes:
Report is written for receiving the Modbus comprising the first field, the second field and data field from ISCS in receiving module
Text, first field include register count, and the data field includes data, wherein when the register count is greater than Modbus
When the maximum register count that agreement is supported, second field includes predetermined mark, when the register count is less than or equal to
When the maximum register count that Modbus agreement is supported, second field includes the byte number corresponding to the register count；
Module is obtained, for being obtained from the data field based on the register count extracted from first field
Data.
The byte number corresponding to register count is strictly written in the second field as it can be seen that being different from the prior art, in the present invention
In embodiment, when register count is greater than the maximum register count that Modbus agreement is supported, be not written in the second field
Corresponding to the byte number of register count, but predetermined mark is written in the second field, to well evade a byte-sized
Byte digital section for write-in data limitation.Moreover, BAS, which is not based on the second field, obtains data, but it is based on first
Register count in field obtains data, and mass data transmission may be implemented.
In one embodiment, the Modbus write-in message also includes initial address；The device further include:
Writing module, for the initial address be write-in initial position and the register count be write-in register
Number, the write-in data obtained from data field.
Therefore, Modbus, which is written in message, to include initial address, be well compatible with existing Modbus TCP standard
Agreement.
Data transmission device, including processor and memory；
It is stored with the application program that can be executed by the processor in the memory, is used for so that the processor executes
As above described in any item methods for sending data, or as above described in any item methods for receiving data.
Computer readable storage medium is wherein stored with computer-readable instruction, and the computer-readable instruction is for executing such as
Upper described in any item methods for sending data, or as above described in any one., reception data method.
Computer program product is stored on computer readable storage medium, including computer program instructions, the calculating
Machine program instruction, which is performed, can make an at least processor execute as above described in any item methods for sending data, or as above
Described in any item methods for receiving data.
Detailed description of the invention
Fig. 1 is the method flow diagram that embodiment of the present invention ISCS reads data in BAS.
Fig. 2 is the structure chart for the device that embodiment of the present invention BAS sends data to ISCS.
Fig. 3 is the method flow diagram that data are written to BAS by embodiment of the present invention ISCS.
Fig. 4 is the structure chart for the device that embodiment of the present invention BAS receives data from ISCS.
Fig. 5 is the structure chart for the device that embodiment of the present invention data transmit data between BAS and ISCS.
Wherein, appended drawing reference is as follows:
| Label | Meaning |
| 101~103 | Step |
| 200 | Send the device of data |
| 201 | Receiving module |
| 202 | Generation module |
| 203 | Sending module |
| 301~303 | Step |
| 400 | Receive the device of data |
| 401 | Receiving module |
| 402 | Obtain module |
| 403 | Writing module |
| 500 | Data transmission device |
| 501 | Processor |
| 502 | Memory |
Specific embodiment
In order to which technical solution of the present invention and advantage is more clearly understood, below in conjunction with drawings and the embodiments, to this
Invention is further elaborated.It should be appreciated that the specific embodiments described herein are only used to illustrative illustrate originally
Invention, is not intended to limit the scope of protection of the present invention.
It is succinct and intuitive in order to what is described, hereafter by describing several representative embodiments come to side of the invention
Case is illustrated.A large amount of details is only used for helping to understand the solution of the present invention in embodiment.However, it will be apparent that of the invention
Technical solution can be not limited to these details when realizing.In order to avoid unnecessarily having obscured the solution of the present invention, Yi Xieshi
It applies mode not described meticulously, but only gives frame.Hereinafter, " comprising " refers to " including but not limited to ", " root
According to ... " refer to " according at least to ..., but be not limited to according only to ... ".Due to the speech habits of Chinese, hereinafter without spy
When not pointing out the quantity of an ingredient, it is meant that the ingredient is either one or more, or can be regarded as at least one.
Applicant furthers investigate the basic principle of Modbus Transmission Control Protocol, finds in Modbus TCP standard agreement, adopts
The register number in message is indicated with a byte (byte).One byte can only at most meet the communication of 125 registers,
And the traffic between BAS and ISCS is frequently larger than 125 registers, therefore existing Modbus TCP standard agreement can not expire
Big quantity communication need between sufficient BAS and ISCS.
The technical issues of to solve big quantity communication between BAS and ISCS, applicant to Modbus TCP standard agreement into
Row local deformation to break through the traffic limitation of 125 registers, and realizes that the communication of the big quantity between BAS and ISCS needs
It asks.
Communication between BAS and ISCS, including following two application scenarios:
(1), ISCS reads data from BAS；(2), data are written to BAS in ISCS.
The big number between BAS and ISCS can be realized respectively for both application scenarios based on embodiment of the present invention
Amount communication.
Firstly, description ISCS reads the application scenarios of data from BAS.
Fig. 1 is the method flow diagram that embodiment of the present invention ISCS reads data in BAS.This method is suitable for BAS system,
Such as can be applied to the main side programmable logic controller (PLC) (PLC) in BAS system or from end PLC in.
As shown in Figure 1, this method comprises:
Step 101: receiving the Modbus comprising register count from ISCS and read message.
Herein, BAS receives Modbus from ISCS and reads message.Modbus is read in message and Modbus standard agreement
Read message format having the same.That is, the reading message being compared in Modbus standard agreement, the present invention is implemented
The Modbus of mode, which reads message, can not modify format, it is only necessary to which the register count write-in Modbus for reading expectation reads report
In text.
Table 1 is that the content of Modbus reading message describes table.
Table 1
As shown in table 1, Modbus read message length be 6 words (12 byte), comprising packet header (Map headers),
Function code (Function Code), data (Data) part and verification portion.Wherein:
Packet header includes a Transaction Identifier high position (the Transaction identifier Hi), length that length is a byte
For the Transaction Identifier low level (Transaction identifier Lo) of a byte, the protocol-identifier that length is two bytes
According with (Protocol identifier), length (Length) field that length is two bytes and length is setting for a byte
Standby unit number (Unit identifier) field.Description has the length information from current byte byte to the end in length field.
Function code length is 1 byte, for identifying the read operation for being directed to register.
Data portion includes initial address (Starting address) field and register count (Number of
Registers) field.It include initial address in origing address field (OAF), which is the starting point of read operation；Register
Include the data volume of read operation in digital section, that is, it is expected the register count read.
It include to post in the register count field of data portion as it can be seen that being read in message in Modbus as shown in Table 1
Storage number.
Step 102: generating the Modbus comprising the first field, the second field and data field and reply message, in the first word
In section write-in determined based on register count, length information from current byte byte to the end, base is written in data field
In the data that register count determines, wherein when register count is greater than the maximum register count that Modbus agreement is supported, the
Predetermined mark is written in two fields.
In the reply message of Modbus standard agreement, in the byte digital section of data portion, a table of bytes is utilized
Show the register number in message, and thus has the shortcomings that at most meet the communication of 125 registers.
Herein, the Modbus of embodiment of the present invention reads the first field in message, corresponds to Modbus standard and assists
View replys the length field for being located at packet header in message；The Modbus of embodiment of the present invention reads the second field in message,
Byte number (the Number of bytes) field being located in data portion in message is replied corresponding to Modbus standard agreement.
The reply message to compare in Modbus standard agreement, embodiment of the present invention proposes Modbus reply message tool
There is improvement.Improvements include: to reply in message in the Modbus of embodiment of the present invention, when register count is assisted greater than Modbus
When discussing maximum register count (that is, the prior art supported 125) supported, in byte number (the Number of of data portion
Bytes) the predetermined mark of field write-in.Preferably, which may be embodied as 0x00.
Table 2 is that the content of Modbus reply message describes table.
Table 2
As shown in table 2, it includes packet header (Map headers), function code (Function that Modbus, which replys message,
Code), data (Data) part and verification portion.Wherein:
Packet header includes a Transaction Identifier high position (the Transaction identifier Hi), length that length is a byte
For the Transaction Identifier low level (Transaction identifier Lo) of a byte, the protocol-identifier that length is two bytes
According with (Protocol identifier), length (Length) field that length is two bytes and length is setting for a byte
Standby unit number (Unit identifier) field.Description has the register count read in message based on Modbus in length field
Length information identified, from current byte byte to the end, such as, it is assumed that the register count that Modbus is read in message is
N, then length information is 2 × N+3 (byte), wherein " 2 × N " is the corresponding data byte amount of register count；" 3 " are unit
The sum of number field, function code and byte number of byte digital section.
Function code length is 1 byte, for identifying the read operation for being directed to register.
Data portion includes byte number (Number of bytes) field and data field.Base is written in data field
In include Modbus read message in register count determined by data.When include Modbus read message in deposit
When device number is greater than maximum register count (that is, the prior art supported 125) that Modbus agreement is supported, in byte digital section
The predetermined mark of write-in.
Wherein, it includes: to be originated with initial address to read that the data determined based on register count are written in data field
Position and register count are to read register count, read data；Read data are written in data field.
Reply message in Modbus standard agreement, which has, is similar to structure described in table 2.But, it is assisted in Modbus standard
In reply message in view, the byte number corresponding to register count is strictly written in byte digital section, therefore can only at most be written
255, that is, it could support up the communication of 125 registers.However, the Modbus in the application is replied in message, when register count is big
When maximum register count that Modbus agreement is supported (that is, the prior art supported 125), do not write in byte digital section
Enter to correspond to the byte number of register count, but predetermined mark is written, to well evade the byte number an of byte-sized
Limitation of the section for write-in data.
Step 103: it is sent to ISCS and replys message, wherein when ISCS detects predetermined mark in the second field, base
Data are read from data field in length information.
After BAS generates Modbus reply message in a step 102, is sent to ISCS and reply message.ISCS receives reply
After message, when detecting predetermined mark in the second field, data are read from data field based on length information.For example,
When length information is M, it can determine that corresponding register size is (M-3)/2.Then, then from reply message data field
The middle data for reading (M-3)/2 register.
Therefore, in embodiment of the present invention, ISCS can be determined that register count is greater than Modbus agreement by predetermined mark
The maximum register count supported, is not based on byte digital section and determines register count, but is based on being stored in the second field
In length information determine register count, to meet the big quantity communication need between BAS and ISCS.
In one embodiment, when register count is less than or equal to the maximum register count that Modbus agreement is supported,
In a step 102, the byte number corresponding to register count is written in BAS in the second field.When ISCS does not have in the second field
When detecting predetermined mark, data are read from data field based on the byte number
As it can be seen that when ISCS does not detect predetermined mark in the second field, ISCS can criterion register number be less than
Equal to the maximum register count that Modbus agreement is supported, ISCS still is based on the byte number in byte digital section from data at this time
Data are read in field, to well be compatible with existing Modbus TCP standard agreement.
Data instance is read from the main side PLC in BAS with the front end processor server in ISCS below, to embodiment party of the present invention
Formula carries out exemplary illustrated.
Front end processor server sends Modbus as shown in Table 1 to main side PLC and reads message.The reading message totally 12 word
Section, specifically: the 1st word (word includes two bytes) is message identification number, and the Transaction Identifier including the first byte is high-order
With the Transaction Identifier low level of the second byte；Third byte and nybble are protocol identifier, content 0X0000；5th byte
It include the byte number at the end from current location to message with the 6th byte；7th byte is unit number；8th byte is to read life
Enable mark (specially 0X03)；9th byte and crossed joint are the initial address that front end processor server reads main side plc data；
11st byte and the 12nd byte are the register number that front end processor server reads data in the PLC of main side.
Main side PLC receives the Modbus that front end processor server is sent and reads message, first receives Modbus reads message preceding 6
A byte data, and this preceding 6 byte data is stored in and is received in data block.Main side PLC is according to the 5th byte and the 6th word
The message of subsequent length is received the subsequent bit received in data block by the content (byte number of the current location to message end) of section
It sets.
Main side PLC is according to the initial address and the 11st byte received in data block in the 9th byte and crossed joint and the
Register number (i.e. reading data length) in 12 bytes, sentences the range in the communication data area of main side PLC planning
It is disconnected, in which:
(1), when main side PLC has found to read the range in communication data area of the data length beyond main side PLC planning, main side
PLC generates communication command error message, and to front end processor server Returning communication order error message.
(2), when main side PLC has found to read range of the data length without departing from the communication data area planned main side PLC,
Main side PLC copies to the content in the first byte, the second byte, third byte and the nybble that receive in data block
Modbus replys the corresponding position of message, and inserts and be based in the 5th byte and the 6th byte that Modbus replys message
Modbus read it is that register count in message determines, from the length information of current byte byte to the end (for example, if Modbus
Reading the register count in message is N, then length information is 2 × N+3 (byte)), the 7th byte of message is replied in Modbus
Unit number is inserted, the 8th byte inserts function code；Wherein: if the data that front end processor server reads main side PLC are long
Degree is less than or equal to 125 registers, then corresponds to the byte number of register count in the 9th byte filling that Modbus replys message
(for example, byte number is 2 × M if it is M that Modbus, which reads the register count in message)；If front end processor server is read
The data length of main side PLC is greater than 125 registers, then the 9th byte filling predetermined mark (ratio of message is replied in Modbus
Such as, 0X00), Modbus reply message subsequent content in, be sequentially written in from BAS plan communication data area replicate, by
Front end processor server is sent to according to the data for the corresponding data length that initial address starts, and by Modbus reply message.
When front end processor server receives communication command error message, the alarm communication system on human-computer interaction interface (HMI)
Mistake.When front end processor server, which receives Modbus, replys message, if can be in the 9th byte of Modbus reply message
In detect predetermined mark, based on Modbus reply message the 5th byte and the 6th byte in length information read data simultaneously
It is stored in database, if predetermined mark cannot be detected in the 9th byte that Modbus replys message, is replied based on Modbus
Byte number in 9th byte of message reads data and is stored in database.
Data instance is read from main side PLC with front end processor server above, data are read from BAS to ISCS and carry out demonstration
Illustrate, it will be appreciated by those of skill in the art that this description is only exemplary, is not intended to limit the present invention embodiment
Protection scope.
Embodiment of the present invention also proposed the device that a kind of BAS sends data to ISCS.
Fig. 2 is the structure chart for the device that embodiment of the present invention BAS sends data to ISCS.The device is arranged into BAS,
For example it can be arranged into the ethernet communication module of main side PLC, or be arranged into the ethernet communication module from end PLC.
As shown in Fig. 2, the device 200 includes:
Receiving module 201 reads message for receiving the Modbus comprising register count from ISCS；
Generation module 202 replys message for generating the Modbus comprising the first field, the second field and data field,
Length information determining based on register count, from current byte byte to the end is written in the first field, in data field
The data that middle write-in is determined based on register count, wherein when register count is greater than the maximum register count that Modbus agreement is supported
When, predetermined mark is written in the second field；
Sending module 203 replys message for sending to ISCS；
When wherein detecting predetermined mark in the second field as ISCS, number is read from data field based on length information
According to.
In one embodiment, generation module 202 are also used to be supported when register count is less than or equal to Modbus agreement
Maximum register count when, in the second field write-in correspond to register count byte number；Wherein when ISCS is in the second field
In when not detecting predetermined mark, data are read from data field based on byte number.
In one embodiment, it also includes initial address that Modbus, which reads message,；Generation module 202, for starting
Address is reading initial position and register count is to read register count, reads data；It is written in data field read
Data.
Application scenarios of the ISCS to BAS write-in data are described below.
Fig. 3 is the method flow diagram that data are written to BAS by embodiment of the present invention ISCS.This method is suitable for BAS, such as
It can be applied in the main side PLC in BAS system.
As shown in figure 3, this method comprises:
Arrangement 301: receiving the Modbus comprising the first field, the second field and data field from ISCS and message be written, the
One field includes register count, and data field includes data, wherein when register count is greater than the maximum that Modbus agreement is supported
When register count, the second field includes predetermined mark, when register count is less than or equal to the maximum deposit that Modbus agreement is supported
When device number, the second field includes the byte number corresponding to register count.
Herein, BAS receives Modbus from ISCS and message is written.
In the write-in message of Modbus standard agreement, in write verse number (the Write bytes of data portion
Numbers) in field, using the register count in a byte representation message, and the logical of 125 registers can only at most be met
News.
Herein, the first field in the Modbus write-in message of embodiment of the present invention, corresponds to Modbus standard and assists
Register count (Write register numbers) field is write positioned at data portion in the write-in message of view；The present invention is implemented
Mode Modbus write-in message in the second field, corresponding in the write-in message of Modbus standard agreement be located at data portion
In write verse number (Write bytes numbers) field.
The write-in message to compare in Modbus standard agreement, embodiment of the present invention proposes Modbus write-in message tool
There is improvement.Improvements include: to be propped up in the write-in message of embodiment of the present invention when register count is greater than Modbus agreement
When maximum register count (that is, the prior art supported 125) held, in write verse number (the Number of of data portion
Bytes) the predetermined mark of field write-in.Preferably, which may be embodied as 0x00.
Table 3 is that the content of Modbus write-in message describes table.
Table 3
As shown in table 3, it includes packet header (Map headers), function code (Function that message, which is written, in Modbus
Code), data (Data) part and verification portion.Wherein:
Packet header includes a Transaction Identifier high position (the Transaction identifier Hi), length that length is a byte
For the Transaction Identifier low level (Transaction identifier Lo) of a byte, the protocol-identifier that length is two bytes
According with (Protocol identifier), length (Length) field that length is two bytes and length is setting for a byte
Standby unit number (Unit identifier) field.
Function code length is 1 byte, for identifying the write operation for being directed to register.
Data portion includes initial address (Starting address) field, writes register count (Write register
Numbers) field and write verse number (Write bytes numbers) field.It include initial address in origing address field (OAF), it should
Initial address is the starting point of write operation；Write the register count in register count field comprising write operation.Work as register count
When maximum register count (that is, the prior art supported 125) supported greater than Modbus agreement, in writing for data portion
The predetermined mark of joint number field write-in.Preferably, which may be embodied as 0x00.When register count is less than or equal to Modbus
When maximum register count that agreement is supported (that is, the prior art supported 125), write in the write verse number field of data portion
Enter to correspond to the byte number of register count.
Write-in message in Modbus standard agreement, which has, is similar to structure described in table 3.But, it is assisted in Modbus standard
In write-in message in view, strictly write-in corresponds to the byte number of register count in the write verse number field of data portion, because
This can only at most be written 255, that is, could support up the communication of 125 registers.However, message is written in the Modbus in the application
In, when register count is greater than maximum register count (that is, the prior art supported 125) that Modbus agreement is supported, and
Do not correspond to the byte number of register count in the write-in of write verse number field, but predetermined mark is written, to well evade one
Limitation of the byte digital section of byte-sized for write-in data.
Step 302: based on the register count extracted from the first field, data are obtained from data field.
Herein, BAS system is directly based upon the register count extracted from the first field, and number is obtained from data field
According to.Namely based on the register count of table 3 write in register count field, data are obtained from data field.
As it can be seen that being different from obtaining from data field in Modbus standard agreement based on the byte number in write verse number field
Data, embodiment of the present invention is based on the register count extracted from the first field, so as to realize between BAS and ISCS
Big quantity communication.
In one embodiment, this method further include: BAS system is write-in initial position and register with initial address
Number is write-in register count, and the data obtained from data field are written.
In one embodiment, this method further include: after data are written in BAS system, sent to ISCS system
Response message is written in Modbus.
The write-in response message format having the same in response message and Modbus standard agreement is written in Modbus.Also
It is to say, the write-in response message being compared in Modbus standard agreement, the Modbus write-in response report of embodiment of the present invention
The format of text can not modify specific format, it is only necessary to will be in the register number that had been written into filling Modbus write-in response message
.
Table 4 is that the content of Modbus write-in response message describes table.
Table 4
As shown in table 4, it is 6 words (12 byte) that response message length, which is written, in Modbus, includes packet header (Map
Headers), function code (Function Code), data (Data) part and verification portion.Wherein:
Packet header includes a Transaction Identifier high position (the Transaction identifier Hi), length that length is a byte
For the Transaction Identifier low level (Transaction identifier Lo) of a byte, the protocol-identifier that length is two bytes
According with (Protocol identifier), length (Length) field that length is two bytes and length is setting for a byte
Standby unit number (Unit identifier) field.
Function code length is 1 byte, for identifying the write operation for being directed to register.
Data portion includes initial address (Starting address) field and register count (Number of
Registers) field.It include initial address in origing address field (OAF), which is the starting point of write operation；Register
It include the data volume of write operation, that is, the register number having been written into digital section.
Data instance is written in the main side PLC with the redundancy machine server in ISCS into BAS below, to embodiment party of the present invention
Formula carries out exemplary illustrated.
Redundancy machine server sends Modbus as shown in table 3 to main side PLC and message is written.The of message is written in Modbus
One word (word includes two bytes) is message identification number, a Transaction Identifier high position and the second byte including the first byte
Transaction Identifier low level；Third byte and nybble are protocol identifier, content 0X0000；5th byte and the 6th byte report
Byte number of the text comprising the end from current location to message；7th byte is unit number；8th byte is write order mark
Know (specially 0X 16)；9th byte and crossed joint are the initial address for the data that main side PLC is written in redundancy machine server；
11st byte and the 12nd byte are the register number that main side PLC is written in redundancy machine server；When redundancy machine server is write
When entering the register count of main side PLC less than or equal to 125, the 13rd byte is that main side PLC is written corresponding to redundancy machine server
Register count byte number, for example, if redundancy machine server write-in main side PLC register count be N, the 13rd word
Section write-in 2 × N (byte)；When the register count of redundancy machine server write-in main side PLC is greater than 125, the 13rd byte is
Predetermined mark (for example, 0X00)；Tenth nybble starts the specific data content that main side PLC is written for redundancy machine server.
Main side PLC receives the Modbus that redundancy machine server is sent and message is written, and first receives preceding the 6 of Modbus write-in message
A byte data, and this preceding 6 byte data is stored in and is received in data block.Then, main side PLC is according to the 5th byte and
After the content (byte number of the current location to message end) of six bytes receives the message of subsequent length in reception data block
Continuous position.
Main side PLC is according to the initial address and the 11st byte received in data block in the 9th byte and crossed joint and the
Register number (i.e. write-in data length) in 12 bytes, sentences the range in the communication data area of main side PLC planning
It is disconnected, in which:
(1), when main side PLC has found the range in communication data area of the write-in data length beyond main side PLC planning, main side
PLC generates communication command error message, and to redundancy machine server Returning communication order error message.
(2), when main side PLC has found range of the write-in data length without departing from the communication data area planned main side PLC,
All data after the tenth nybble received in data field are stored in main side according to the initial address in write order by main side PLC
In the communication data area of PLC planning.Moreover, main side PLC will receive the first byte in data block, the second byte, third byte and
Content in nybble copies to the corresponding position of Modbus write-in response message, the 6th of Modbus write-in response message the
0x06 is filled in byte, the 7th byte inserts 0x01, and the 8th byte is inserted 0x16, filled out respectively in the 9th byte~the 12nd byte
Enter the initial address and data length in Modbus write-in message, Modbus write-in response message is then sent to redundancy machine clothes
Business device, expression are write as function.
Data instance is written to main side PLC with redundancy machine server above, demonstration is carried out to BAS write-in data to ISCS
Illustrate, it will be appreciated by those of skill in the art that this description is only exemplary, is not intended to limit the present invention embodiment
Protection scope.
Embodiment of the present invention also proposed the device that a kind of BAS receives data from ISCS.
Fig. 4 is the structure chart for the device that embodiment of the present invention BAS receives data from ISCS.The device is arranged into BAS,
For example it can be arranged into the ethernet communication module of main side PLC, or be arranged into the ethernet communication module from end PLC.
As shown in figure 4, the device 400 includes:
Receiving module 401 is written for receiving the Modbus comprising the first field, the second field and data field from ISCS
Message, the first field include register count, and the data field includes data, wherein when register count is greater than Modbus agreement institute
When the maximum register count of support, the second field includes predetermined mark, is supported when register count is less than or equal to Modbus agreement
Maximum register count when, the second field include corresponding to register count byte number；
Module 402 is obtained, for obtaining data from data field based on the register count extracted from the first field.
In one embodiment, it also includes initial address that message, which is written, in Modbus；The device 400 further include:
Writing module 403, for initial address be write-in initial position and register count be write-in register count, write-in
The data obtained from data field.
In the foregoing description, message is read to the Modbus of embodiment of the present invention, Modbus replys message, Modbus writes
The specific format and purposes for entering message and Modbus write-in response message are described in detail.It is to be understood that: the present invention
The Modbus of embodiment reads message, Modbus replys message, response message is written simultaneously in Modbus write-in message and Modbus
Not necessarily is remained exactly the same with Modbus standard agreement, but Modbus standard agreement is applied in field of track traffic
Optimal improvements.
Embodiment of the present invention also proposed a kind of data transmission device with processor and memory construction.
Fig. 5 is the structure chart for the device that embodiment of the present invention data transmit data between BAS and ISCS.
As shown in figure 5, the device 500 for transmitting data between BAS and ISCS includes processor 501 and memory 502；
It is stored with the application program that can be executed by processor 501 in memory 502, is used for so that processor 501 executes such as
Upper described in any item methods for sending data or the method for receiving data.
Wherein, memory 502 specifically may be embodied as Electrically Erasable Programmable Read-Only Memory (EEPROM), flash memory
The multi storages such as (Flash memory), programmable program read-only memory (PROM).Processor 501 may be embodied as wrapping
One or more central processing units or one or more field programmable gate arrays are included, wherein field programmable gate array integrates one or more
A central processing unit core.Specifically, central processing unit or central processing unit core may be embodied as CPU or MCU.
It should be noted that step and module not all in above-mentioned each process and each system construction drawing is all necessary
, certain steps or module can be ignored according to the actual needs.Each step execution sequence be not it is fixed, can be according to need
It is adjusted.System structure described in the various embodiments described above can be physical structure, be also possible to logical construction, that is, have
A little modules may be realized by same physical entity, be realized alternatively, some modules may divide by multiple physical entities, alternatively, can be with
It is realized jointly by certain components in multiple autonomous devices.
Hardware module in each embodiment mechanically or can be realized electronically.For example, a hardware module
It may include that the permanent circuit specially designed or logical device (such as application specific processor, such as FPGA or ASIC) are specific for completing
Operation.Hardware module also may include programmable logic device or circuit by software provisional configuration (as included general procedure
Device or other programmable processors) for executing specific operation.Mechanical system is used as specific, or using dedicated permanent
Property circuit, or Lai Shixian hardware module (such as is configured) by software using the circuit of provisional configuration, can according to cost with
Temporal consideration is to determine.
The present invention also provides a kind of machine readable storage medium, storage is for making a machine execute side as described herein
The instruction of method.Specifically, system or device equipped with storage medium can be provided, store in realization on the storage medium
State the software program code of the function of any embodiment in embodiment, and make the system or device computer (or CPU or
MPU the program code being stored in a storage medium) is read and executed.Further, it is also possible to be made by the instruction based on program code
Operating system of hands- operation etc. is calculated to complete partly or completely practical operation.It can also will read from storage medium
The expansion being connected to a computer is write in memory set in the expansion board in insertion computer or write to program code
In the memory being arranged in exhibition unit, then the instruction based on program code makes to be mounted on expansion board or expanding element
CPU etc. comes execution part and whole practical operations, to realize the function of any embodiment in above embodiment.
Storage medium embodiment for providing program code include floppy disk, hard disk, magneto-optic disk, CD (such as CD-ROM,
CD-R, CD-RW, DVD-ROM, DVD-RAM, DVD-RW, DVD+RW), tape, non-volatile memory card and ROM.Selectively,
It can be by communication network from download program code on server computer or cloud.
A kind of computer program product proposed in the embodiment of the present invention, is stored on computer readable storage medium,
Including computer program instructions, the computer program instructions, which are performed, can make an at least processor execute any of the above-described reality
The method for applying transmission data described in mode, or the method for receiving data.
The above, better embodiment only of the invention, is not intended to limit the scope of the present invention.It is all
Within the spirit and principles in the present invention, any modification, equivalent replacement, improvement and so on should be included in guarantor of the invention
Within the scope of shield.
Claims (13)
1. the method for sending data, which is characterized in that this method is suitable for environment and equipment monitoring system, this method comprises:
The Modbus comprising register count, which is received, from track traffic synthetic monitoring system reads message (101)；
It generates the Modbus comprising the first field, the second field and data field and replys message, be written in first field
Length information being determined based on the register count, from current byte byte to the end, is written base in the data field
In the data that the register count determines, wherein when the register count is greater than the maximum register count that Modbus agreement is supported
When, predetermined mark (102) is written in second field；
The reply message (103) is sent to the track traffic synthetic monitoring system；
Wherein when the track traffic synthetic monitoring system detects the predetermined mark in second field, it is based on institute
It states length information and reads data from the data field.
2. the method according to claim 1 for sending data, which is characterized in that when the register count is less than or equal to
When the maximum register count that Modbus agreement is supported, write-in corresponds to the byte of the register count in second field
Number；
Wherein when the track traffic synthetic monitoring system does not detect the predetermined mark in second field, base
Data are read from the data field in the byte number.
3. the method according to claim 1 for sending data, which is characterized in that the Modbus reads message and also included
Beginning address；
It is described in data field be written based on the register count determine data include:
With the initial address be reading initial position and the register count is to read register count, reads data；
Read data are written in the data field.
4. sending the device (200) of data, which is characterized in that the device (200) is arranged in environment and equipment monitoring system, should
Device (200) includes:
Receiving module (201) reads message for receiving the Modbus comprising register count from track traffic synthetic monitoring system；
Generation module (202) replys message, In for generating the Modbus comprising the first field, the second field and data field
Length information determining based on the register count, from current byte byte to the end is written in first field, in institute
The data for being written in data field and determining based on the register count are stated, wherein when the register count is greater than Modbus agreement institute
When the maximum register count of support, predetermined mark is written in second field；
Sending module (203), for sending the reply message to the track traffic synthetic monitoring system；
Wherein when the track traffic synthetic monitoring system detects the predetermined mark in second field, it is based on institute
It states length information and reads data from the data field.
5. the device (200) according to claim 4 for sending data, which is characterized in that
The generation module (202) is also used to be less than or equal to the maximum deposit that Modbus agreement is supported when the register count
When device number, write-in corresponds to the byte number of the register count in second field；
Wherein when the track traffic synthetic monitoring system does not detect the predetermined mark in second field, base
Data are read from the data field in the byte number.
6. the device (200) according to claim 4 for sending data, which is characterized in that the Modbus reads message also
Include initial address；
The generation module (202), for being that read initial position and the register count be to read to post with the initial address
Storage number reads data；Read data are written in the data field.
7. the method for receiving data, which is characterized in that this method is suitable for environment and equipment monitoring system, this method comprises:
The Modbus comprising the first field, the second field and data field is received from track traffic synthetic monitoring system, and report is written
Text, first field include register count, and the data field includes data, wherein when the register count is greater than Modbus
When the maximum register count that agreement is supported, second field includes predetermined mark, when the register count is less than or equal to
When the maximum register count that Modbus agreement is supported, second field includes the byte number corresponding to the register count
(301)；
Based on the register count extracted from first field, data (302) are obtained from the data field.
8. the method according to claim 7 for receiving data, which is characterized in that the Modbus is written message and has also included
Beginning address；This method further include:
With the initial address be write-in initial position and the register count is write-in register count, and write-in is described from data word
The data (303) obtained in section.
9. receiving the device (400) of data, which is characterized in that the device (400) is arranged in environment and equipment monitoring system, the dress
Setting (400) includes:
Receiving module (401) includes the first field, the second field and data word for receiving from track traffic synthetic monitoring system
Message is written in the Modbus of section, and first field includes register count, and the data field includes data, wherein posting when described
When storage number is greater than the maximum register count that Modbus agreement is supported, second field includes predetermined mark, is posted when described
When storage number is less than or equal to the maximum register count that Modbus agreement is supported, second field includes to correspond to the deposit
The byte number of device number；
It obtains module (402), for being obtained from the data field based on the register count extracted from first field
Data.
10. the device (400) according to claim 9 for receiving data, which is characterized in that the Modbus write-in message is also
Include initial address；The device (400) further include:
Writing module (403), for the initial address be write-in initial position and the register count be write-in register
Number, the write-in data obtained from data field.
11. data transmission device (500), which is characterized in that including processor (501) and memory (502)；
The application program that can be executed by the processor (501) is stored in the memory (502), for so that the processing
Device (501) executes any in the method for sending data as claimed any one in claims 1 to 3, or such as claim 7 to 8
The method of reception data described in.
12. computer readable storage medium, which is characterized in that be wherein stored with computer-readable instruction, the computer-readable finger
It enables for executing the method for sending data as claimed any one in claims 1 to 3, or any one of such as claim 7 to 8
The method of the reception data.
13. computer program product, which is characterized in that be stored on computer readable storage medium, including computer program refers to
It enables, the computer program instructions, which are performed, can be such that an at least processor executes as described in any one of claims 1 to 3
Transmission data method, or the method for the reception data as described in any one of claim 7 to 8.
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