CN103856375A - Single-slave end multi-master end distributed Ethernet system, construction method and communication method of single-slave end multi-master end distributed Ethernet system - Google Patents

Single-slave end multi-master end distributed Ethernet system, construction method and communication method of single-slave end multi-master end distributed Ethernet system Download PDF

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CN103856375A
CN103856375A CN 201210506443 CN201210506443A CN103856375A CN 103856375 A CN103856375 A CN 103856375A CN 201210506443 CN201210506443 CN 201210506443 CN 201210506443 A CN201210506443 A CN 201210506443A CN 103856375 A CN103856375 A CN 103856375A
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end
single
ethernet
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master
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CN 201210506443
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孙凯
李智刚
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中国科学院沈阳自动化研究所
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Abstract

The invention discloses a single-slave end multi-master end distributed Ethernet system, a construction method and communication method of the single-slave end multi-master end distributed Ethernet system. The single-slave end multi-master end distributed Ethernet system includes an upper computer which is connected with an Ethernet switch and has a specified IP address and a floating port number, and Ethernet switches which at least comprise one Ethernet switch above; and each Ethernet switch has a fixed IP address and a fixed port number, and is connected with a terminal device through a serial port/Ethernet converter. According to the single-slave end multi-master end distributed Ethernet system, the construction method and communication method of the single-slave end multi-master end distributed Ethernet system, a single-slave end multi-master end reversal structure is adopted. With the single-slave end multi-master end distributed Ethernet system, the construction method and communication method of the single-slave end multi-master end distributed Ethernet system of the invention adopted, the communication burden of the system will not be increased with the increase of nodes under the premise that slave end-to-master end communication states are completely mastered, and the stability and security of the system can be greatly ensured; and the communication structure of a slave end is in an asynchronous multi-thread mode, and therefore, the salve end can simultaneously monitor all the communication states of all mater ends at the same time, and the communication efficiency and stability of the system can be greatly improved.

Description

单从端多主端分布式以太网系统及其构建方法和通讯方法 From single-end multihost distributed Ethernet system construction method and communication method

技术领域 FIELD

[0001] 本发明公开一种可用于多种复杂工业场合的单从端多主端分布式以太网系统及其构建方法和通讯方法。 [0001] The present invention discloses a variety of complex may be used for single-end industrial applications from multiple distributed Ethernet system main side construction method and communication method.

背景技术 Background technique

[0002] 以太网通讯多采用单主端多从端的通讯结构构架方式,这种方式适用于通讯从端数目有限且固定的方式。 [0002] Multi-single Ethernet communications from the master communication multi-mode terminal frame structure, this method is applicable to a limited number of communication from the end and in a fixed manner. 随着通讯结构的复杂,通讯从端的数目不断增加,许多工况下从端数目还无法固定。 With the complex communication structures, communication from the increasing number of peers, many conditions can not fix the number of clients. 这种情况下,通讯主端的负担不断加大且总量无法估计,通讯系统处于一种负担不断增加、风险不断加大的状态,给系统的稳定性带来了极大的隐患。 In this case, the burden on the primary-side communication increasing and the total amount can not be estimated, the communication system is a burden increasing the risk of increasing the state, to the stability of the system has brought great risks.

发明内容 SUMMARY

[0003] 针对现有技术存在的上述不足之处,本发明要解决的技术问题是提供一种可用于多种复杂工业场合的单从端多主端分布式以太网通讯方法及装置。 [0003] In response to these deficiencies in the prior art, the present invention is to solve the technical problem is to provide a complex variety of industrial applications for the single method and apparatus for a distributed ethernet communication from the main terminal of the multiplexer.

[0004] 本发明为实现上述目的所采用的技术方案是:一种单从端多主端分布式以太网系统,包括 [0004] Technical Solution To achieve the above object of the present invention is used is: a single-end from a multihost distributed Ethernet system, comprising

[0005] 一台上位机,连接一台以太网交换机,具有指定的IP地址和浮动的端口号; [0005] a master station is connected to an Ethernet switch, with a specified IP address and port number of the float;

[0006] 太网交换机,至少为上述一台以太网交换机,每个以太网交换机具有其固定的IP地址和端口号,通过串口/以太网转换器连接终端设备。 [0006] Ethernet switch, the above-mentioned at least one Ethernet switch, the Ethernet switch each having a fixed IP address and port number, the terminal device is connected via serial / Ethernet converter.

[0007] 每个串口/以太网转换器均指定192.168.1段内的唯一的IP地址。 [0007] Each serial / Ethernet converter are specified with a unique IP address within the segment 192.168.1.

[0008] 一种单从端多主端分布式以太网系统的构建方法,以一台上位机为从端,所述上位机连接的多个以太网交换机为主端,包括以下步骤: [0008] The method of constructing a single-end from a multihost distributed Ethernet system, so as to from a master station end, a plurality of Ethernet switches connected to the PC-based terminal, comprising the steps of:

[0009] 固定每一个主端的IP地址和端口号,指定从端的IP地址而不固定端口号; [0009] Each of the primary-side fixed IP address and port number, the IP address designated from the end without being fixed port number;

[0010] 扫描的所有主端的数目,从一个号码开始编号,并以加I的方法逐渐递增端口号,使每一个主端对应一个端口号; [0010] The number of all the primary-side scanning, numbered from one number, and add I to the method of gradually increasing the port number, so that each end of a main number corresponding to a port;

[0011] 从端通过固定的IP地址和浮动的端口号绑定主端,与不同的主端发送通讯请求;主端记录下发送通讯请求的从端IP地址和端口号,并以此IP地址和端口号与从端通讯。 [0011] transmitted from the terminal through a fixed IP address and port number of the floating main binding with different primary terminal end communication request; sending the communication request from the end of the master record IP address and port number, IP address and thus and communicate with the port number from the end.

[0012] 所述从端按照主端数目,开辟同样数目的端口号。 [0012] from the end of the primary side according to the number, the same number of opened port number.

[0013] 所述一个号码为10000。 [0013], wherein a number of 10,000.

[0014] 一种单从端多主端分布式以太网系统的通讯方法,以一台上位机为从端,所述上位机连接的多个以太网交换机为主端,包括以下步骤: [0014] A method of communications from single end multihost distributed Ethernet system, so as to from a master station end, a plurality of Ethernet switches connected to the PC-based terminal, comprising the steps of:

[0015] 通过构造ThreadStart类型的线程构造函数在从端开启独立的“读取线程”; [0015] By constructing ThreadStart thread type constructor in the open separate "read thread" from the end;

[0016] 存放读取数据的内存区存满数据后产生触发信号,触发“读取线程”,实现异步“读取线程”,数被取走后清空内存区,继续循环挂起“读取线程”; After generating [0016] storing the read data memory area is full of data strobe signal to trigger "read threads" asynchronous "read thread", the number of empty memory area is removed, the cycle continues suspend "read thread ";

[0017] 主端通过动态赋予参数的方法实现“委托”异步处理数据;将数据上传至从端。 [0017] The primary-side implementation "request" by the method of dynamic process data asynchronously imparting parameters; upload data to the slave terminal.

[0018] 所述数据存储在数据库中,其存储方法为:添加数据库ADOX动态链接;添加数据库ADODB动态链接;指定数据表存储位置;指定数据表键值个数;为每一个键值命名;周期性插入数据;更新数据库并回到周期性插入数据步骤 [0018] The data stored in a database, storing method: Add ADOX dynamic link database; ADODB add dynamic link database; storage location of the designated data table; key number table designating data; name for each key value; cycle insertion of data; updating the database and return to the step of periodically inserting data

[0019] 本发明的方法和装置彻底颠覆这一传统通讯构架,采取一个从端多个主端的反转式结构,最大优点是在实现从端对主端通讯状态完全掌握的前提下不会随着节点数目的增多而增加系统的通讯负担,大大保障了系统的稳定和安全,在从端的通讯结构设计还采用了异步多线程的方式,使从端在同一时间可同时监听所有主端的通讯状态,大大提高系统的通讯效率和稳定性。 [0019] The method and apparatus of the present invention to overturn the traditional communications architecture, taken from a reverse side of the main structure of a plurality of ends, the maximum advantage is achieved from the lower end of the main end fully grasp the communication status with the premise of not the number of nodes increased to increase communication burden on the system, greatly guarantee the stability and security of the system, from the communication structure design side also uses asynchronous multi-threaded way, so that from the end can listen to while at the same time the communication status of all of the main terminal and greatly improve communications efficiency and stability of the system. 具有优点如下: It has the following advantages:

[0020] 1.所有终端设备均加入以太网进行数据传输,统一协议有利于扩展; [0020] 1. All terminal devices are added Ethernet data transmission protocol facilitate uniform spreading;

[0021] 2.系统挂接终端设备数量可以以24倍数(总数据量小于lGB/s)的数目扩展,真正实现了分布式这一工业领域较高要求; Quantity [0021] 2. The system may be mounted terminal device 24 fold (total data amount is less than lGB / s) the number of extensions, the truly distributed high industrial requirements;

[0022] 3.采用了独特的上位机作为从站、下位机作为主站的特殊网络构架,极大的减轻了上位机的资源需求,使“可扩展”真正成为可能; [0022] 3. Using a unique network architecture as a special PC slave lower machine as the master station, greatly reduce the resource requirements for the host computer, so that the "scalability" really possible;

[0023] 4.数据监听、读取、处理采用了独立线程和委托的方式,最大限度减轻了上位机的负担,大大提高了系统的稳定性和处理能力; [0023] 4. The monitor data, read, and processed using a separate thread entrusted to maximize reduce the burden of the host computer, the system greatly improved stability and processing power;

[0024] 5.使用数据库为应用提供完整的实时的数据,为后续的数据分析和处理带来方便。 [0024] The application provides a complete database of real-time data, brings convenience for subsequent analysis and processing of data.

附图说明 BRIEF DESCRIPTION

[0025] 图1本发明装置电路原理图; [0025] FIG means a circuit diagram of the invention;

[0026] 图2本发明单从端多主端通讯构建方法控制程序流程图; [0026] FIG. 2 of the present invention from a single end of a multihost communication method for constructing a flowchart of a control program;

[0027] 图3本发明数据库存储方法控制程序流程图。 [0027] FIG 3 database stores a control program flowchart of process of the invention.

具体实施方式 detailed description

[0028] 下面结合附图及实施例对本发明做进一步的详细说明。 [0028] Example embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings and.

[0029] 如图1-3所示,系统包括一台上位机,运行实现单从端多主端分布式以太网通讯方法的控制程序;上位机通过8芯网线连接10M/100M网络交换机;交换机通过网线连接连接RS232/以太网转换器、RS485/以太网转换器、RS422/以太网转换器、以太网视频服务器,以太网音频服务器。 [0029] 1-3, the system comprising a master station, the control program run from the end of the single-master side of the distributed multiple Ethernet communication method; connection 10M / 100M host computer through the network switch core cable 8; switch It is connected through the network cable RS232 / Ethernet converter, RS485 / Ethernet converter, RS422 / Ethernet converter, the video server Ethernet, Ethernet audio server. 将每个转换器均指定192.168.1段内的唯一的IP地址;每个转换器可直接连接终端设备,包括S232设备、RS485设备、RS422设备、视频设备、音频设备;交换机通过网线连接视频解码设备和音频解码设备。 Each converter is to specify a unique IP address within the segment 192.168.1; converter can be directly connected to each terminal device, the device comprising S232, RS485 devices, RS422 devices, video equipment, audio equipment; switch is connected through the network cable video decoder and audio decoding devices.

[0030] 单从端多主端的通讯方法首先固定每一个主端的IP地址和端口号,但只指定从端的IP而不固定端口号,然后扫面入网的所有主端的数目,从10000号开始编号并以加I的方法逐渐递增端口号从而与每一个主端对应。 [0030] Single from the communication method of the end multi-primary-side first fixing each of the primary-side IP address and port number, but only the specified from the client's IP without a fixed port number, then the number of all primary-side scan plane network, from 10000 Number and to a method of incrementally adding I port number so as to correspond to each main terminal. 通过固定的IP地址绑定浮动的端口号与每一个主端建立通讯,主端记录下请求通讯的从端IP和端口号,并以此IP和端口号与从端通讯。 Floating binding fixed IP address by port number from the terminal to establish IP and port number of the communication requests communication, the master record with each main terminal, and thus the communication with the IP and port number from the terminal.

[0031] 读取数据采用异步方法读取,节省系统资源,减轻了主程序负担。 [0031] The read data is read using asynchronous method, system resources are saved, reducing the burden of the main program. 每一个网络设备均采用单独的线程池进行处理。 Each network equipment uses a separate processing thread pool. 数据缓存堵塞后采用委托的方式处理数据。 After the jam treatment data cache data by way of delegate. 数据库采用定时器触发方式触发,间隔固定周期存储数据。 Database using the timer trigger triggered, data storage regular interval. 视频和音频数据均采用可读方式直接存储,为播放视频和音频带来最大方便。 Video and audio data are used directly readable storage, greatest convenience for playing audio and video.

[0032] 本发明一种具有数据库功能的单从端多主端分布式以太网通讯方法包括单从端多主端通讯构建方法和数据库存储方法,分别如下: Single end multi from [0032] the present invention having a primary side of the distributed database functionality Ethernet communication method and a method comprising constructing a single database storage methods from the end of a multihost communications, are as follows:

[0033] 单从端多主端通讯构建方法: [0033] The method of constructing a single terminal from a multihost Communication:

[0034] 检测交换机状态,如果不正常则发出警报并循环检测,如果正常则继续执行; [0034] The detection switch status, if not normal, the loop detection and alarm, if the normal execution continues;

[0035] 检测广24号以太网服务器状态,如果;有问题则发出警报; [0035] No. 24 wide detection Ethernet server status, if; there is a problem then alert;

[0036] 固定从端IP地址; [0036] From the end of the fixed IP address;

[0037] 扫描入网的主端数目; [0037] The number of main scan-network;

[0038] 固定主端IP地址和端口号; [0038] The primary end fixed IP address and port number;

[0039] 按照主端数目在从端开辟同样数目的端口号,并以加I的方式保证端口号没有重置; [0039] In accordance with the number of master terminal from the open end of the same number of the port number, and add I to ensure that the port number is not reset mode;

[0040] 通过IP地址和不同的端口号向不同的主端发送通讯请求; [0040] transmits a communication request to a different end of the primary IP address and a different port number;

[0041] 主端记录下从端的IP地址和端口号并用该IP地址和端口号回传数据; From the end of [0041] the master record IP address and port number of the data and return the IP address and port number;

[0042] 从端打开数去数据功能; [0042] from the open end to the number of function data;

[0043] 开启独立的“读取线程”; [0043] open separate "read thread";

[0044] 异步“读取线程”,循环挂起; [0044] asynchronous "read thread", suspend the cycle;

[0045] “委托”异步处理数据; [0045] "delegate" asynchronous processing transactions;

[0046] 将数据上传至上位机。 [0046] The data uploaded to the upper unit.

[0047] 数据库存储方法: [0047] The database storage methods:

[0048] 添加数据库ADOX动态链接; [0048] Adding database ADOX Dynamic Link;

[0049] 添加数据库ADODB动态链接; [0049] Add ADODB database dynamically linked;

[0050] 指定数据表存储位置; [0050] Specifies the data table storage location;

[0051] 指定数据表键值个数; [0051] Specifies the number of data key table;

[0052] 为每一个键值命名; [0052] The key value for every named;

[0053] 周期性插入数据; [0053] periodically inserted in the data;

[0054] 更新数据库并回到周期性出入数据步骤。 [0054] Back to periodically update the database and data access step.

Claims (7)

  1. 1.一种单从端多主端分布式以太网系统,其特征在于,包括一台上位机,连接一台以太网交换机,具有指定的IP地址和浮动的端口号; 太网交换机,至少为上述一台以太网交换机,每个以太网交换机具有其固定的IP地址和端口号,通过串口/以太网转换器连接终端设备。 A single-end from a multihost distributed ethernet system comprising a master station is connected to an Ethernet switch with the specified IP address and port number of floating; Ethernet switch, at least an Ethernet switch described above, each Ethernet switch having a fixed IP address and port number, the terminal device is connected via serial / Ethernet converter.
  2. 2.根据权利要求1所述的单从端多主端分布式以太网系统,其特征在于,每个串口 /以太网转换器均指定192.168.1段内的唯一的IP地址。 According to claim 1 from a single end of the master multiple distributed Ethernet system, characterized in that each serial / Ethernet converter are specified with a unique IP address within the segment 192.168.1.
  3. 3.一种根据权利要求1所述的单从端多主端分布式以太网系统的构建方法,其特征在于,以一台上位机为从端,所述上位机连接的多个以太网交换机为主端,包括以下步骤: 固定每一个主端的IP地址和端口号,指定从端的IP地址而不固定端口号; 扫描的所有主端的数目,从一个号码开始编号,并以加I的方法逐渐递增端口号,使每一个主端对应一个端口号; 从端通过固定的IP地址和浮动的端口号绑定主端,与不同的主端发送通讯请求;主端记录下发送通讯请求的从端IP地址和端口号,并以此IP地址和端口号与从端通讯。 3. A method according to claim 1 from single-end multihost distributed Ethernet system construction method, wherein, in order from a master station end, a plurality of Ethernet switches connected to the host computer based terminal, comprising the steps of: each of the primary-side fixed IP address and port number, specify the IP address of the client rather than a fixed port number; the number of all the primary-side scanning, from a number starting number, and to add I approach gradually incrementing a port number, so that each end of a main number corresponding to a port; from the end of the fixed IP address and port number of the floating main binding terminal sends the communication request different primary terminal; master record end communication request transmitted from the terminal IP address and port number, and use the IP address and port number and communication from the end.
  4. 4.根据权利要求3所述的单从端多主端分布式以太网系统的构建方法,其特征在于,所述从端按照主端数目,开辟同样数目的端口号。 According to claim 3, solely from the end of a multihost distributed Ethernet system construction method, characterized in that, from the end of the primary side according to the number, the same number of opened port number.
  5. 5.根据权利要求3所述的单从端多主端分布式以太网系统的构建方法,其特征在于,所述一个号码为10000。 According to claim 3, solely from the end of a multihost distributed Ethernet system construction method, characterized in that, said a number of 10,000.
  6. 6.一种根据权利要求1所述的单从端多主端分布式以太网系统的通讯方法,其特征在于,以一台上位机为从端,所述上位机连接的多个以太网交换机为主端,包括以下步骤: 通过构造ThreadStart类型的线程构造函数在从端开启独立的“读取线程”; 存放读取数据的内存区存满数据后产生触发信号,触发“读取线程”,实现异步“读取线程”,数被取走后清空内存区,继续循环挂起“读取线程”; 主端通过动态赋予参数的方法实现“委托”异步处理数据;将数据上传至从端。 6. A method according to claim 1 from a single-end communication method multihost distributed Ethernet system, characterized in that, in order from a master station end, a plurality of Ethernet switches connected to the host computer based terminal, comprising the steps of: opening a separate "read thread" from the end of the thread through the structure type constructor ThreadStart; generating a trigger signal after the storage of the read data memory area is full of data, trigger "read thread", asynchronous "read thread", the number of empty memory area is removed, the cycle continues suspend "read thread"; primary-side to achieve "request" by the method of dynamic process data asynchronously imparting parameters; upload data to the slave terminal.
  7. 7.根据权利要求6所述的单从端多主端分布式以太网系统的通讯方法,其特征在于,所述数据存储在数据库中,其存储方法为:添加数据库ADOX动态链接;添加数据库ADODB动态链接;指定数据表存储位置;指定数据表键值个数;为每一个键值命名;周期性插入数据;更新数据库并回到周期性插入数据步骤。 According to claim 6, said method of communication from the single end multihost distributed Ethernet system, wherein said data stored in a database, storing method: Add ADOX dynamic link database; add database ADODB dynamic link; storage location of the designated data table; table specifies the number of data keys; each named key-value; periodically insert data; Back to periodically update the database and data insertion step.
CN 201210506443 2012-11-30 2012-11-30 Single-slave end multi-master end distributed Ethernet system, construction method and communication method of single-slave end multi-master end distributed Ethernet system CN103856375A (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101165621A (en) * 2006-10-17 2008-04-23 望 江 Remote automation system
CN101226397A (en) * 2008-02-04 2008-07-23 南京理工大学;无锡锡通工程机械有限公司 High reliability distributed Ethernet test control system
CN101483728A (en) * 2008-12-31 2009-07-15 深圳市同洲电子股份有限公司 Digital television receiving terminal, connecting apparatus, system and method
US20110267950A1 (en) * 2005-05-06 2011-11-03 Orckit Corrigent, Ltd. Tunnel provisioning with link aggregation and hashing
CN102662365A (en) * 2012-04-26 2012-09-12 中国人民解放军海军工程大学 Method and system for monitoring state of ship power monitoring network
CN202998138U (en) * 2012-11-30 2013-06-12 中国科学院沈阳自动化研究所 A distributed Ethernet system with a single auxiliary end and multiple main ends

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110267950A1 (en) * 2005-05-06 2011-11-03 Orckit Corrigent, Ltd. Tunnel provisioning with link aggregation and hashing
CN101165621A (en) * 2006-10-17 2008-04-23 望 江 Remote automation system
CN101226397A (en) * 2008-02-04 2008-07-23 南京理工大学;无锡锡通工程机械有限公司 High reliability distributed Ethernet test control system
CN101483728A (en) * 2008-12-31 2009-07-15 深圳市同洲电子股份有限公司 Digital television receiving terminal, connecting apparatus, system and method
CN102662365A (en) * 2012-04-26 2012-09-12 中国人民解放军海军工程大学 Method and system for monitoring state of ship power monitoring network
CN202998138U (en) * 2012-11-30 2013-06-12 中国科学院沈阳自动化研究所 A distributed Ethernet system with a single auxiliary end and multiple main ends

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