WO2011011915A1 - 数据通信方法、通信设备及通信系统 - Google Patents
数据通信方法、通信设备及通信系统 Download PDFInfo
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- WO2011011915A1 WO2011011915A1 PCT/CN2009/072970 CN2009072970W WO2011011915A1 WO 2011011915 A1 WO2011011915 A1 WO 2011011915A1 CN 2009072970 W CN2009072970 W CN 2009072970W WO 2011011915 A1 WO2011011915 A1 WO 2011011915A1
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- Prior art keywords
- port
- data
- master device
- slave
- function
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/40006—Architecture of a communication node
- H04L12/40019—Details regarding a bus master
Definitions
- the present invention relates to the field of data communication technologies, and in particular, to a data communication method, a communication device, and a communication system.
- each device of the communication system is usually connected using a bus.
- the bus used is, for example, an RS422 bus or an RS485 bus, which are all serial data buses.
- the RS422 bus can support 10 node devices
- the RS485 bus can support 32 node devices
- multiple node devices form a network.
- the network topology formed by using the RS422 bus or the RS485 bus adopts a bus type structure.
- each node device When implementing point-to-multipoint communication, each node device generally has one master device, and the rest are slave devices.
- a bus type network is formed by using an RS422 bus or an RS485 bus, which is usually implemented as follows: Taking an RS485 bus as an example, an RS485 bus is connected from an interface of a master device to a slave device, and the slave device and the like The devices are connected in sequence via the RS485 bus. Among them, each slave node device provides two cable connectors, one for connecting to the bus of the previous device and the other for connecting to the bus of the next device. In this way, when the slave device is changed in position or in the middle, the connection between the two slave devices only needs to be changed, and the connection of other slave devices is not affected, so that the wiring and cable fabrication in the field is convenient.
- a corresponding address dial switch is provided on each slave device.
- the state of the dial switch is manually set to set a different address of the slave device, and the master device performs the interaction with the slave device according to the address of the slave device. .
- the prior art implements the connection in the bus type network manner, when the bus connection of one of the slave devices and the next slave device fails, This will result in inaccessibility of all slave devices behind the slave device, so the reliability of the prior art connection method is low.
- the technical problem to be solved by the embodiments of the present invention is to provide a data communication method, a communication device, and a communication system with high connection reliability.
- a data communication method comprising: The master device transmits data to one of the at least two slave devices, wherein the master device includes a first RS485/RS422 port and a second RS485/RS422 port, and the master device passes the first RS485/ of the master device
- An RS422 port and a second RS485/RS422 port are connected to the at least two slave devices via an RS485/RS422 bus loop from a first RS485/RS422 port of the master device to a first RS485/RS422 port of the master device
- the connected slave device transmits data
- the function of transmitting data of the first RS485/RS422 port of the master device is turned on, and the function of sending data of the second RS485/RS422 port of the master device is turned off;
- the function of transmitting data of the first RS485/RS422 port of the master device is turned off, and the function of transmitting data of the second RS485/RS422 port of the master device is turned on.
- a communication device comprising:
- a transceiver unit configured to send data to one of the at least two slave devices, the communication device passing through the first RS485/RS422 port and the second RS485/RS422 port of the transceiver unit and the at least two slave devices
- the first RS485/RS422 port of the transceiver unit transmits data to the slave device connected to the first RS485/RS422 port of the transceiver unit through the RS485/RS422 bus loop connection
- the first RS485/ of the transceiver unit is turned on. Sending data function of the RS422 port, and simultaneously turning off the sending data function of the second RS485/RS422 port of the transceiver unit;
- the control unit is configured to: when detecting that the line is interrupted, turn off the sending data function of the first RS485/RS422 port of the transceiver unit, and simultaneously open the sending data function of the second RS485/RS422 port of the transceiver unit.
- a communication system comprising:
- the master device including a first RS485/RS422 port and a second RS485/RS422 port;
- the master device is configured to send data to one of the at least two slave devices, where the master device passes the first RS485/RS422 port and the second RS485/RS422 port of the master device At least two slave devices are connected through an RS485/RS422 bus loop, and when the master device transmits data from the first RS485/RS422 port to the slave device connected to the first RS485/RS422 port, the master device is turned on.
- the master device turns off the function of transmitting data of the first RS485/RS422 port of the transceiver unit, and simultaneously opens the function of sending data of the second RS485/RS422 port of the transceiver unit.
- a base station :
- the main control board is configured to send data to one of the at least two slave devices, where the main control board includes a first RS485/RS422 port and a second RS485/RS422 port, where the master control The board is connected to the at least two slave devices through an RS485/RS422 bus loop through a first RS485/RS422 port and a second RS485/RS422 port of the main control board, from the first RS485/RS422 of the main control board
- the port sends data to the slave device connected to the first RS485/RS422 port of the main control board
- the function of sending data of the first RS485/RS422 port of the main control board is opened, and the second of the main control board is closed.
- the function of transmitting data of the first RS485/RS422 port of the main control board is turned off, and the transmission data function of the second RS485/RS422 port of the main control board is simultaneously turned on.
- the technical solution of the embodiment of the present invention is that the master device sends data to one of the at least two slave devices, where the master device passes the first RS485/RS422 port and the second RS485/RS422 port. Opening the at least two slave devices through an RS485/RS422 bus loop, and opening the first device from the first RS485/RS422 port to the first RS485/RS422 port connected slave device.
- the function of sending data of the RS485/RS422 port, and the function of sending data of the second RS485/RS422 port of the master device is turned off.
- the first RS485 of the master device can be turned off according to the ring network structure.
- FIG. 1 is a flow chart of a data communication method according to an embodiment of the present invention
- connection mode is a schematic diagram of a connection mode according to an embodiment of the present invention.
- FIG. 3 is a schematic diagram of processing after detecting a connection interruption according to an embodiment of the present invention.
- FIG. 4 is a schematic structural diagram of an internal circuit of a master device in an embodiment of the present invention.
- FIG. 5 is a schematic structural diagram of a communication device according to an embodiment of the present invention.
- FIG. 6 is a schematic structural diagram of a communication system according to an embodiment of the present invention.
- FIG. 1 is a flow chart of a data communication method according to an embodiment of the present invention.
- Step 101 The master device sends data to one of the at least two slave devices, where the master device includes a first RS485/RS422 port and a second RS485/RS422 port, where the master device passes the first device An RS485/RS422 port and a second RS485/RS422 port are connected to the at least two slave devices via an RS485/RS422 bus loop, from the first RS485/RS422 port of the master device to the first RS485 of the master device /
- the slave device connected to the RS422 port transmits data, the function of transmitting data of the first RS485/RS422 port of the master device is turned on, and the function of sending data of the second RS485/RS422 port of the master device is turned off;
- the first RS485 port and the second RS485 port correspond to the RS485 bus
- the first RS422 port and the second RS422 port correspond to the RS422 bus, that is, when the first RS485 port is selected, the second RS485 port is selected correspondingly.
- the RS485 bus when the first RS422 port is selected, the second RS422 port and the RS422 bus are selected correspondingly.
- the master device passes the first RS485/RS422 port of the master device and the second RS485/
- the RS422 port is connected to at least two slave devices via a bus loop including:
- the first RS485/RS422 port of the master device is connected to the first RS485/RS422 port of the first slave device of the at least two slave devices via an RS485/RS422 bus, and the second RS485/ of the first slave device RS422 port through the RS485/RS422 bus and the at least two slave devices
- the second RS485/RS422 port of the second slave device is connected, the at least two slave devices are sequentially connected through the RS485/RS422 bus, and the last slave device of the at least two slave devices communicates with the master through the RS485/RS422 bus
- the second RS485/RS422 port of the device is connected.
- Step 102 When detecting that the line is interrupted, turn off the sending data function of the first RS485/RS422 port of the master device, and simultaneously open the sending data function of the second RS485/RS422 port of the master device.
- the detecting the line interruption includes: determining that the line is determined when the first RS485/RS422 port of the master device does not receive the data transmitted by the slave device of the first RS485/RS422 port of the master device. An interrupt occurs and the interrupt location is determined.
- the determining the interruption location includes:
- the function of transmitting the data of the first RS485/RS422 port of the master device and simultaneously opening the data function of the second RS485/RS422 port of the master device includes:
- the technical solution of the embodiment of the present invention is that the master device sends data to one of the at least two slave devices, wherein the master device passes the first RS485/RS422 port and the second RS485/RS422.
- a port is connected to the at least two slave devices through a bus loop, and data is sent from the first RS485/RS422 port to the slave device connected to the first RS485/RS422 port, and when detecting a line interruption, a ring network structure, the function of transmitting data of the first RS485/RS422 port of the master device is turned off, and the function of sending data of the second RS485/RS422 port of the master device is turned on, so that all slave devices can be realized even if the line is interrupted
- the access overcomes the shortcomings of the prior art in connection with the bus type network, and improves the reliability of the connection. The technical solutions of the embodiments of the present invention are further described in detail below.
- connection mode 2 is a schematic diagram of a connection mode according to an embodiment of the present invention.
- the master device sets two RS485/RS422 ports, which are CON1 and CON2 respectively.
- CON1 and CON2 can be two independent physical ports or a separate physical port.
- two logical RS485/RS422 ports are implemented through two connectors (for example, RJ45).
- Each slave device provides one RS485/RS422 input port and one RS485/RS422 output port.
- the first RS485/RS422 port and the second RS485/RS422 port of each slave device are sequentially connected by the CON1 and CON2 of the master device, that is, the CON1 of the master device is connected to the first RS485/RS422 port of the first slave device, A second RS485/RS422 port of the slave device is connected to the first RS485/RS422 port of the second slave device, and so on, and the second RS485/RS422 port of the last slave device is connected to the CON2 of the master device, thereby forming a logic Ring.
- the master device controls the access of CON1 and CON2 to achieve mutual exclusion, that is, when CON1 accesses the slave device (sends data), CON2 prohibits access (forbids CON2 to send data), and when CON2 accesses the slave device, CON1 prohibits access.
- the master device can be set to access all the slave devices through CON1 by default.
- the master device communicates and controls the slave devices on the bus through CON1, and the sending function of CON2 is in the off state.
- the master device accesses the slave device after the breakpoint via CON2.
- FIG. 3 is a schematic diagram of processing after detecting a connection interruption according to an embodiment of the present invention.
- the line between device 1 and slave 2 is interrupted.
- CON1 of the master can only access slave 0 and slave 1, and slave 2 to slave N after the break point cannot be accessed.
- the master can turn off CON1 and use the CON2 of the master to access the slave after the breakpoint.
- the master device turns on CON1 and CON2 in turn according to the principle of time division, so as to achieve normal access to all slave devices, and avoid the defects in the prior art that all slave devices are inaccessible due to bus interruption.
- the master device can determine whether the line is interrupted based on the status of the data received by CON1.
- the data sent by the master device through CON1 can be received through CON1. If it is found that the data sent by CON1 cannot be received, it can be judged that the line is interrupted.
- the master device needs to determine the specific location where the interrupt occurs, that is, determine which slave line after the slave device is interrupted.
- the master device can determine the specific location of the interrupt based on the detected address of the slave device.
- FIG. 4 is a schematic diagram showing the internal circuit structure of a master device in an embodiment of the present invention.
- the method includes: a bus sending unit 1, a bus receiving unit 1, a bus transmitting unit 2, a bus receiving unit 2, a data transceiving unit 1, a data transceiving unit 2, a control unit, and a bus transmission enable control. unit.
- bus transmitting unit 1 and the bus receiving unit 1 are connected to CON1 of the master device, and the bus transmitting unit 2 and the bus receiving unit 2 are connected to CON2 of the master device.
- the data transceiving unit 1 is respectively connected to the bus transmitting unit 1 and the bus receiving unit 1 to realize receiving and transmitting data of CON1; the data transceiving unit 2 is respectively connected with the bus transmitting unit 2 and the bus receiving unit 2 to realize data reception of CON2 and send.
- the data transceiving unit 1 and the data transceiving unit 2 transmit the received data to the control unit or transmit the transmission data of the control unit.
- the control unit realizes the opening and closing control of the transmission function of the bus transmitting unit 1 and the bus transmitting unit 2 through the bus transmission enabling control unit.
- the control unit sends the "Enable Control” signal output from the enable control unit via the bus to open the bus transmission unit 1, so that the control unit can send data externally via CON1.
- the control unit sends the output of the enable control unit via the bus.
- the "Enable Control 2" signal turns off Bus Transmitter Unit 2, avoiding the bus conflict caused by CON1 and CON2 simultaneously outputting data. This allows the master device to achieve normal access to all slave devices via CON1.
- the control unit determines that the slave device of some address cannot access normally, the control unit controls the transmission enable control unit to output the "enable control signal" to turn off the bus transmitting unit 1, and simultaneously control the bus transmission enable control unit output” enable control.
- the 2" signal turns on the bus transmitting unit 2, so that the master device can access the device behind the line break point via the loop bus through the CON2.
- the master/slave control unit sequentially turns on the bus transmitting unit 1 and the bus unit according to the time division principle. 2, thereby achieving normal access to all slave devices.
- FIG. 5 is a schematic structural diagram of a communication device according to an embodiment of the present invention.
- the communication device includes: a transceiver unit 1001 and a control unit 1002.
- the transceiver unit 1001 is configured to send data to one of the at least two slave devices, where the communication device passes through the first RS485/RS422 port and the second RS485/RS422 port of the transceiver unit 1001 and the at least two slave devices through the RS485. / RS422 bus loop connection.
- the first RS485/RS422 port, the second RS485/RS422 port, and the RS485/RS422 bus are applicable,
- the first RS485 port and the second RS485 port correspond to the RS485 bus
- the first RS422 port and the second RS422 port correspond to the RS422 bus, that is, when the first RS485 port is selected, the second RS485 port and the RS48 bus are selected correspondingly
- the second RS422 port and the RS422 bus are selected correspondingly.
- the function of transmitting data of the first RS485/RS422 port of the transceiver unit 1001 is turned on, and Turning off the sending data function of the second RS485/RS422 port of the transceiver unit 1001;
- the control unit 1002 is configured to: when detecting an interruption of the line, turn off the function of sending data of the first RS485/RS422 port of the transceiver unit 1001, and simultaneously open the function of sending data of the second RS485/RS422 port of the transceiver unit 1001. .
- the control unit 1002 includes: a detecting unit 10021 and a processing unit 10022.
- the detecting unit 10021 is configured to: when detecting that the first RS485/RS422 port of the transceiver unit 1001 does not receive the data transmitted by the slave device of the first RS485/RS422 port connected to the transceiver unit 1001, determine that the line is interrupted, and determine Interrupted position
- the processing unit 10022 is configured to close the transmit data function of the first RS485/RS422 port of the transceiver unit 1001, and simultaneously open the transmit data function of the second RS485/RS422 port of the transceiver unit 1001.
- the detecting unit 10021 determines that the position between the slave device and the previous connected slave device is a break point. ;
- the processing unit 10022 controls to transmit data from the second RS485/RS422 port of the transceiver unit 1001 to the slave device after the determined interruption point, and then sequentially controls the first RS485/ from the transceiver unit 1001 according to the time division principle.
- the RS422 port transmits data to the slave device preceding the determined break point, and transmits data from the second RS485/RS422 port of the transceiver unit 1001 to the slave device after the determined break point.
- the communication device in the embodiment of the present invention may be a base station, where the base station includes a main control board, and the main control board may include the transceiver unit 1001 and the control unit 1002, that is, the transceiver unit 1001 and the control unit.
- the function of 1002 can be implemented by the main control board of the base station.
- the main control board is configured to send data to one of the at least two slave devices, where the main control board includes a first RS485/RS422 port and a second RS485/RS422 port, where the main control board passes the a first RS485/RS422 port and a second RS485/RS422 port of the main control board are connected to the at least two slave devices via an RS485/RS422 bus loop, from the first RS485/RS422 port of the main control board to the When the slave device connected to the first RS485/RS422 port of the main control board transmits data, the function of transmitting data of the first RS485/RS422 port of the main control board is opened, and the second RS485/RS422 port of the main control board is closed.
- Send data function
- the function of transmitting data of the first RS485/RS422 port of the main control board is turned off, and the transmission data function of the second RS485/RS422 port of the main control board is simultaneously turned on.
- the main control board determines that the line is interrupted and determines the interrupt position.
- FIG. 6 is a schematic structural diagram of a communication system according to an embodiment of the present invention.
- the communication system includes: a master device 1101, and at least two slave devices 1102.
- the master device 1101 is configured to send data to one of the at least two slave devices 1102, where the master device 1101 passes through the first RS485/RS422 port and the second RS485/RS422 port of the master device. Opening at least two slave devices 1102 through an RS485/RS422 bus loop, when transmitting data from a first RS485/RS422 port of the master device to a slave device connected to a first RS485/RS422 port of the master device The function of transmitting data of the first RS485/RS422 port of the master device, and simultaneously turning off the function of sending data of the second RS485/RS422 port of the master device;; when detecting the interruption of the line, turning off the first RS485 of the master device / Send data function of the RS422 port, and simultaneously open the transmission data function of the second RS485/RS422 port of the master device.
- the at least two slave devices 1102 and the master device 1101 are connected by a bus loop.
- the master device 1101 determines that the line is interrupted, and determines that the slave device 1102 is connected to the previous one.
- the location between devices 1102 is a break point;
- the master device 1101 controls to transmit data from the second RS485/RS422 port of the master device to the slave device 1102 after the determined interruption point, and then sequentially controls from the device according to the time division principle.
- the first RS485/RS422 port of the master device transmits data to the slave device 1102 preceding the determined breakpoint, and transmits data from the second RS485/RS422 port of the master device to the slave device 1102 after the determined breakpoint .
- the technical solution of the embodiment of the present invention is that the master device sends data to one of the at least two slave devices, wherein the master device passes the first RS485/RS422 port of the master device and the second RS485/ The RS422 port is connected to the at least two slave devices via an RS485/RS422 bus loop, and when the data is transmitted from the first RS485/RS422 port of the master device to the slave device connected to the first RS485/RS422 port of the master device a function of transmitting data of the first RS485/RS422 port of the master device, and a function of transmitting data of the second RS485/RS422 port of the master device; and detecting a line interruption, according to the ring network structure Turning off the sending data function of the first RS485/RS422 port of the master device, and simultaneously opening the sending data function of the second RS485/RS422 port of the master device, so that access to all slave devices can be realized even
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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PCT/CN2009/072970 WO2011011915A1 (zh) | 2009-07-29 | 2009-07-29 | 数据通信方法、通信设备及通信系统 |
EP09847701A EP2434687A4 (en) | 2009-07-29 | 2009-07-29 | DATA COMMUNICATION METHOD, COMMUNICATION EQUIPMENT AND COMMUNICATION SYSTEM |
CN2009801564367A CN102318267A (zh) | 2009-07-29 | 2009-07-29 | 数据通信方法、通信设备及通信系统 |
BR112012002122A BR112012002122A2 (pt) | 2009-07-29 | 2009-07-29 | método de comunicação de dados, dispositivo de comunicação, e sistema de comunicação |
US13/338,392 US20120093203A1 (en) | 2009-07-29 | 2011-12-28 | Data communication method, communication device, and communication system |
Applications Claiming Priority (1)
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PCT/CN2009/072970 WO2011011915A1 (zh) | 2009-07-29 | 2009-07-29 | 数据通信方法、通信设备及通信系统 |
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US13/338,392 Continuation US20120093203A1 (en) | 2009-07-29 | 2011-12-28 | Data communication method, communication device, and communication system |
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WO2011011915A1 true WO2011011915A1 (zh) | 2011-02-03 |
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PCT/CN2009/072970 WO2011011915A1 (zh) | 2009-07-29 | 2009-07-29 | 数据通信方法、通信设备及通信系统 |
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US (1) | US20120093203A1 (zh) |
EP (1) | EP2434687A4 (zh) |
CN (1) | CN102318267A (zh) |
BR (1) | BR112012002122A2 (zh) |
WO (1) | WO2011011915A1 (zh) |
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Cited By (12)
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CN102185718A (zh) * | 2011-05-12 | 2011-09-14 | 杭州华三通信技术有限公司 | 一种系统升级方法及其装置 |
CN102185718B (zh) * | 2011-05-12 | 2014-06-25 | 杭州华三通信技术有限公司 | 一种系统升级方法及其装置 |
CN102710483A (zh) * | 2012-05-21 | 2012-10-03 | 周明 | 一种rs485智能环路 |
CN103634388A (zh) * | 2013-11-22 | 2014-03-12 | 华为技术有限公司 | 处理存储服务器中控制器重启的方法和相关设备及通信系统 |
CN103634388B (zh) * | 2013-11-22 | 2017-06-20 | 华为技术有限公司 | 处理存储服务器中控制器重启的方法和相关设备及通信系统 |
CN106444527A (zh) * | 2016-11-04 | 2017-02-22 | 南京丰道电力科技有限公司 | 一种基于可编程控制器的背板总线系统 |
CN109088753A (zh) * | 2018-07-27 | 2018-12-25 | 江苏航天大为科技股份有限公司 | 自动检测rs485通信故障的电路和方法 |
CN109088753B (zh) * | 2018-07-27 | 2021-10-26 | 江苏航天大为科技股份有限公司 | 自动检测rs485通信故障的电路和方法 |
CN109993958A (zh) * | 2019-05-08 | 2019-07-09 | 深圳市共济科技股份有限公司 | 一种rs485总线的数据采集系统及方法 |
CN110266573A (zh) * | 2019-07-16 | 2019-09-20 | 河北磐茂科技有限公司 | 基于485通讯的多节点控制电路 |
CN112260916A (zh) * | 2020-09-18 | 2021-01-22 | 深圳市裕展精密科技有限公司 | 通信电路、通信网络及通信异常处理方法 |
CN112737912A (zh) * | 2021-01-05 | 2021-04-30 | 安瑞科(廊坊)能源装备集成有限公司 | 一种485总线系统及其故障诊断方法 |
Also Published As
Publication number | Publication date |
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CN102318267A (zh) | 2012-01-11 |
EP2434687A1 (en) | 2012-03-28 |
BR112012002122A2 (pt) | 2016-05-31 |
US20120093203A1 (en) | 2012-04-19 |
EP2434687A4 (en) | 2012-03-28 |
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