CN106656268B - Monitoring equipment utilizing power line carrier technology and monitoring method thereof - Google Patents
Monitoring equipment utilizing power line carrier technology and monitoring method thereof Download PDFInfo
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- CN106656268B CN106656268B CN201710147888.5A CN201710147888A CN106656268B CN 106656268 B CN106656268 B CN 106656268B CN 201710147888 A CN201710147888 A CN 201710147888A CN 106656268 B CN106656268 B CN 106656268B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
- H04B3/546—Combination of signalling, telemetering, protection
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Abstract
A monitoring device and a monitoring method thereof using a power line carrier technology are used for solving the problems of high wiring difficulty, difficult maintenance and limited transmission rate of a traditional field bus device monitoring system in the application background of a closed space. The method innovates the traditional token bus network technology, applies the improved token bus technology to the power line carrier technology, carries out ad hoc token local area network by the modem on the bus after the system is powered on, provides equal network access service for each node, solves the problem of unpredictable network delay when the traditional power line carrier technology uses CSMA/CA in a processing channel access mechanism, has high reliability and high communication rate, and meets the requirement of equipment monitoring on data transmission reliability. The invention realizes the 'many-to-one' equipment monitoring through the power line carrier technology.
Description
Technical Field
The invention belongs to the technical field of communication, and particularly relates to a monitoring device utilizing a power line carrier technology and a monitoring method thereof.
Background
The monitoring system of the communication equipment has important significance for ensuring a reliable communication link. Since the 80 s in the 20 th century, fieldbus has been widely used in industrial automation control due to its advantages of high reliability, fast communication, wide compatibility, etc. At present, various equipment monitoring and management systems and field bus equipment are various in types, and the requirements of various industries can be met. However, in some application scenarios with limited space, the fieldbus technology also has the problems of high wiring difficulty, limited transmission rate and difficult maintenance.
The power line carrier technology is a communication mode for carrying out carrier transmission by using an existing power distribution network as a transmission medium, and the technology couples communication signals to a power line through a coupling circuit to realize data transmission and information exchange. The power line carrier communication technology is used for data transmission by means of a power line, rewiring is not needed, and the power line carrier communication technology is widely applied to the field of home networking and internet of things.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a monitoring device and a monitoring method thereof, which utilize the power line carrier technology, and can effectively complete the monitoring management of the device without rewiring.
In order to achieve the purpose, the invention adopts the technical scheme that:
a monitoring device utilizing power line carrier technology comprises a main node, a modem and slave nodes, wherein an equipment monitoring system comprises the main node and a plurality of slave nodes, the main node, the slave nodes and the modem form a single bus type topological structure through a power line channel, the main node is a system monitoring base station and receives monitoring data from the slave nodes, and the modem is used for completing modulation, demodulation and coupling of the monitoring data and providing a passage for communication of the main node and the slave nodes; the slave node is a monitored device, monitoring data are sent to the master node according to a specified bus access mechanism, a power line provides a channel for data transmission, and meanwhile, a power supply is provided for the master node, the slave node and the modem;
the master node and the slave node are communicated with the modem interface in a UART or USB communication mode;
the modem mainly comprises a modulation-demodulation module, an AD/DA module and a coupler module, wherein the modulation-demodulation module adopts RS coding to encode node data to avoid single-frequency point pulse interference from a power line channel, then adopts a phase-continuous PSK modulation-demodulation mode to modulate data signals to ensure that spectrum spreading and interference are reduced, then sends the modulated signals to the power line channel through the AD module and the coupler module, and completes the processes of receiving, demodulating, decoding and the like of the signals by the modem connected with the main node in a similar way, and sends monitoring data to the main node.
A method for realizing equipment monitoring by utilizing a power line carrier technology comprises a physical layer design and a data link layer channel access mechanism design, wherein the physical layer mainly realizes a data modulation and demodulation mode and signal processing related contents and provides a bottom access service and an interface for data link layer communication; the data link layer mainly invents a set of multiple access communication scheme based on an improved token bus, which comprises the following steps:
1. the physical layer data transmission process is as follows:
1) the slave node sends the monitoring data to a modem in a UART or USB mode;
2) the modem frames the monitoring data, then carries out RS coding, PSK modulation of continuous phases, DA conversion and signal coupling, and then sends the signals to a power line channel;
3) the master node senses analog signals on the power line through a coupler, and then obtains data from the slave node from a frame through AD conversion, PSK demodulation and RS decoding;
4) the master node sends data to the slave nodes;
2. the data link layer is based on improved token bus multiple access:
1) after the system is powered on, the modem on the bus performs ad hoc networking through the power line, and each node has a unique logical address after networking. Each slave node has a successor address, a successor address and a master node address;
2) when the network is idle, only the idle token flows on the loop continuously;
4) when a station wants to send data, it must intercept the idle token;
3) after the system is powered on, the initial idle token is sent by the master node, and after all the slave nodes are traversed, the last slave node transmits the initial idle token to the master node;
5) if the bit of the passed token is 1, the passed token is not an idle token and can only wait for patiently;
6) if the bit of the passed token is 0, the sending station sets the bit of the token to be 1, sends the information such as the length of data required to be sent by the node to the master node, the master node responds to the slave node after receiving the information and grants the bus access right to the slave node, the slave node assembles the data to be sent into a data frame after receiving the authorization of the master node, and sends the data to the master node, and the slave node can continuously send the data until no data can be sent;
7) and after the slave node finishes sending data, sending a token releasing request to the master node to give out the bus access right. After the main node responds, the idle token is sent to the next slave node;
8) and after all the nodes in the loop finish sending data, sending the idle token to the master node, and accessing the slave node after the master node obtains the token. If the slave node does not need to be accessed, the token can be transferred to the slave node No. 1, and the transfer process continues.
Drawings
FIG. 1 is a power line device monitoring single bus topology;
fig. 2 modem physical layer data processing flow;
fig. 3 token passing on the bus.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1, a method for implementing device monitoring by using power line carrier technology is characterized in that a hardware platform includes a master node, a modem, and slave nodes, a device monitoring system includes a master node and a plurality of slave nodes, the master node, the slave node, and the modem form a single bus topology structure through power line channels, the master node is a system monitoring base station and receives monitoring data from the slave nodes; the modem is used for completing modulation, demodulation and coupling of monitoring data and providing a path for communication of the master node and the slave node; the slave node is a monitored device, monitoring data is sent to the master node according to a specified bus access mechanism, a power line provides a channel for data transmission, and power is provided for the master node, the slave node and the modem, and the monitoring method comprises the following steps:
as shown in fig. 2, the point-to-point data transmission process is as follows:
1) the slave node sends the monitoring data to a modem in a UART or USB mode;
2) the modem frames the monitoring data, then carries out RS coding, PSK modulation of continuous phases, DA conversion and signal coupling, and then sends the signals to a power line channel;
3) the master node senses analog signals on the power line through a coupler, and then obtains data from the slave node from a frame through AD conversion, PSK demodulation and RS decoding;
4) the master node sends data to the slave nodes;
as shown in fig. 3, when processing a communication channel shared by multiple nodes, the present invention adopts an improved token bus technical scheme to provide equal network access service for each node, which has high reliability, high communication rate, determinable network performance, and ensures the requirement of equipment monitoring for transmission delay. The specific implementation mode is as follows:
1) after the system is powered on, the modem on the bus performs ad hoc networking through the power line, and each node has a unique logical address after networking. Each node has a successor address and a successor address, as well as a master node address.
2) When the network is idle, only idle tokens flow around the loop.
3) After the system is powered on, the initial idle token is sent by the master node, and after all the slave nodes are traversed, the last slave node transmits the initial idle token to the master node.
4) When a station wants to send data, it must intercept the idle token.
5) If the bit of the passed token is 1, the passed token is not an idle token and can only wait patiently.
6) If the bit of the passed token is 0, the sending station sets the bit of the token to be 1, assembles the data to be sent into a data frame and sends the data to the master node. The station may continue to transmit until no data is available or until the token hold timer expires.
7) And after the station finishes sending data, releasing the token and sending the idle token to the next node.
8) And after all the nodes in the loop finish sending data, sending the idle token to the master node, and accessing the slave node after the master node obtains the token. If the slave node does not need to be accessed, the token can be transferred to the slave node No. 1, and the transfer process continues.
9) No data frame transmission takes place between the slave nodes.
Claims (1)
1. A method for realizing equipment monitoring by using a power line carrier technology is applied to monitoring equipment by using the power line carrier technology, the monitoring equipment comprises a main node, a modem and a plurality of slave nodes, the main node, the slave nodes and the modem form a single bus type topological structure through a power line channel, the main node is a monitoring base station and receives monitoring data from the slave nodes, and the modem is used for completing modulation, demodulation and coupling of the monitoring data and providing a passage for communication between the main node and the slave nodes; the slave node is a monitored device, monitoring data are sent to the master node according to a specified bus access mechanism, a power line provides a channel for data transmission, and meanwhile, a power supply is provided for the master node, the slave node and the modem;
the master node and the slave node adopt a UART or USB communication mode to communicate with a modem interface;
the modem mainly comprises a modulation-demodulation module, an AD/DA module and a coupler module, wherein the modulation-demodulation module adopts RS coding to code node data to avoid single-frequency point pulse interference from a power line channel, then adopts a phase-continuous PSK modulation mode to modulate the coded data to ensure that spectrum spreading and interference are reduced, then sends the modulated signals to the power line channel through the AD/DA module and the coupler module, and finishes the processes of receiving, demodulating and decoding the signals by the modem connected with the main node and sends monitoring data to the main node;
the method is characterized in that:
the monitoring equipment utilizing the power line carrier technology comprises a physical layer design and a data link layer channel access mechanism design, wherein the physical layer realizes the modulation and demodulation of data and provides a bottom access service and an interface for the communication of the data link layer; the data link layer employs a communication scheme based on multiple access communication of a modified token bus, wherein:
firstly, a physical layer data transmission process is as follows:
1) the slave node sends the monitoring data to a modem in a UART or USB mode;
2) the modem frames the monitoring data, then carries out RS coding, PSK modulation of continuous phases, DA conversion and signal coupling, and then sends the signals to a power line channel;
3) the master node senses analog signals on the power line through a coupler module, and then obtains data from the slave node from a frame through AD conversion, PSK demodulation and RS decoding;
4) the mode of sending data from the master node to the slave node is the same as the mode of sending data from the slave node to the master node;
the communication scheme based on the improved token bus multiple access adopted by the data link layer is as follows:
1) after the system is powered on, the modem on the bus performs ad hoc networking through a power line, each node after networking has a unique logical address, and each slave node has a forward address, a subsequent address and a master node address;
2) when the network is idle, only the idle token flows on the loop continuously;
4) when a node wants to send data, an idle token must be intercepted;
3) after the system is powered on, the initial idle token is sent by the master node, and after all the slave nodes are traversed, the last slave node transmits the initial idle token to the master node;
5) if the token of a passing slave node has a bit of 1, the token is not an idle token;
6) if the token of a passing slave node has a bit of 0, the slave node sets the token bit to 1 and sends the data length information required to be sent by the slave node to the master node, the master node responds to the slave node after receiving the information and grants the bus access right to the slave node, the slave node assembles the data to be sent into a data frame after receiving the authorization of the master node, the data is sent to the master node, and the slave node can continuously send the data until no data can be sent;
7) after the slave node finishes sending data, sending a token releasing request to the master node, giving out the bus access right, and after the master node responds, sending an idle token to the next slave node;
8) and after all the slave nodes in the loop finish data sending, sending the idle token to the master node, accessing the slave nodes by the master node after obtaining the token, and if the slave nodes do not need to be accessed, transmitting the token to the No. 1 slave node and continuing the transmission process.
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| CN112737639B (en) * | 2020-12-24 | 2022-07-12 | 阳光电源股份有限公司 | Phase sequence identification method for power line carrier communication and photovoltaic system |
| WO2023071520A1 (en) * | 2021-10-29 | 2023-05-04 | 南京泉峰科技有限公司 | Electric tool, mower, data communication method, battery pack and tool system |
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| EP0802655A2 (en) * | 1996-04-17 | 1997-10-22 | Matsushita Electric Industrial Co., Ltd. | Communication network |
| CN102843331A (en) * | 2012-09-14 | 2012-12-26 | 深圳市晟思智能电网有限公司 | Carrier communication multi-service access platform system and method |
| CN105471477A (en) * | 2015-12-24 | 2016-04-06 | 特变电工西安电气科技有限公司 | Power line carrier communication system and method based on multi-winding coupling inductor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9313042B2 (en) * | 2011-10-18 | 2016-04-12 | Schneider Electric Buildings, Llc | Self-healing communications network |
| CN103166823B (en) * | 2012-06-07 | 2015-11-25 | 广东广联电子科技有限公司 | Be applied to the alternative space method of family |
| US20180109398A1 (en) * | 2015-04-17 | 2018-04-19 | Philips Lighting Holding B.V. | Master communication device for a token network |
| CN106357301A (en) * | 2016-08-25 | 2017-01-25 | 阳光电源股份有限公司 | Cascaded power line carrier wave method and device |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0802655A2 (en) * | 1996-04-17 | 1997-10-22 | Matsushita Electric Industrial Co., Ltd. | Communication network |
| CN102843331A (en) * | 2012-09-14 | 2012-12-26 | 深圳市晟思智能电网有限公司 | Carrier communication multi-service access platform system and method |
| CN105471477A (en) * | 2015-12-24 | 2016-04-06 | 特变电工西安电气科技有限公司 | Power line carrier communication system and method based on multi-winding coupling inductor |
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Effective date of registration: 20230417 Address after: 325604 Delixi Industrial Park, Liushi Town, Yueqing City, Wenzhou City, Zhejiang Province Patentee after: DELIXI GROUP INSTRUMENT & INSTRUMENTATION CO.,LTD. Address before: 710071 No. 2 Taibai South Road, Shaanxi, Xi'an Patentee before: XIDIAN University |