CN103023715A - Fault monitoring method based on RS485 bus communication link - Google Patents
Fault monitoring method based on RS485 bus communication link Download PDFInfo
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Abstract
The invention discloses a fault monitoring method based on an RS485 bus communication link, which comprises the following steps of: step 1, periodically sending a link diagnosis message with information of each slave node to each slave node by a host node on a data link layer of the RS485 bus communication link; step 2, instantly sending the link diagnosis message with the information of each slave node to the host node after each slave node receives the corresponding diagnosis message; and step 3, after the host node does not receive the corresponding link diagnosis message of the corresponding slave node within determined time, determining that the link or the slave node has faults and indicating and reporting the faults. The method disclosed by the invention periodically transmits the link diagnosis message different from normal data between the host node and the slave node, and judges corresponding fault points according to the reception and feedback time to greatly improve the timely discovery rate of the fault.
Description
Technical field
Whether the present invention relates to network safety filed, being specifically related to a kind ofly has fault to carry out the method for monitoring for host node on the RS485 bus communication link and/or from node.
Background technology
The RS-485 bus is widely a kind of universal serial bus of the automatic field usage comparison that works out of EIA, and the RS-485 bus can be fit to remote digital communication, has multinode, remote and receive highly sensitive characteristics; The RS-485 standard adopts balanced type to send, and the data collector that differential type receives drives bus, has the ability that suppresses common mode disturbances; RS-485 generally adopts half-duplex operation, whenever can only have any to be in the transmission state.The master-slave mode communication Design is generally adopted in communication based on the RS-485 bus, after namely major node sends communication command, is for just making corresponding action behind this node from the node recognition command.Under These characteristics, the diagnostic mode of existing communications protocol based on the RS-485 bus is:
1, the transmission of an executing data, the diagnosis of communication link not being carried out.Behind communication link or the node failure, master and slave node can not be received correct data after sending a period of times of valid data mutually, just can find the fault of communication link, and this just causes finding that the time of fault is uncertain at random.
2, only have by special diagnostic command or diagnostic device communication link is detected, these measures can not guarantee to diagnose real-time carrying out, and fault can only passively occur, but also has increased extra operation or extra equipment.
The existence of the problems referred to above makes RS485 bus communication link Shortcomings on high-security applications.
Summary of the invention
For solving the problem that to find in real time when there is fault in the RS485 communication bus link in the prior art, the invention provides a kind of its in the fault monitoring method of RS485 bus communication link, concrete scheme is as follows: a kind of fault monitoring method based on RS485 bus communication link, it is characterized in that, comprise the steps:
Step 1, by the host node on the data link layer of RS485 bus communication link regularly to respectively sending with respectively from the Diagnosis of Links message of nodal information from node;
Step 2, respectively receive behind the corresponding diagnosis message from node and send with the Diagnosis of Links message from nodal information to host node immediately;
Step 3, in setting-up time, do not receive correspondingly behind the Diagnosis of Links message of node when host node, judge that namely there are fault in this link or this and carry out faulty indication and fault reports from node.
Be preferably: wherein host node is independent calculating for each timing from node.
Be preferably: described host node to fault in the node reporting fault information, stop this transmission from the node normal data, but do not stop this being sent from the Diagnosis of Links message of node, until solve the transmission that this just carries out normal data behind the node failure.
Be preferably: also comprise from node failure active determining step: the time that regularly receives host node Diagnosis of Links message is being set from node, when in setting-up time, not receiving the Diagnosis of Links message of host node from node, judge that namely there are fault in this link or host node and carry out faulty indication and fault reports.
Be preferably: the Diagnosis of Links message of described host node comprise purpose from node address information, send the source address information of diagnosis message, data type and the data check information distinguished mutually with normal data of formulating according to communications protocol.
Be preferably: described Diagnosis of Links message from node comprises purpose host node address information, send the diagnosis message from node address information, data type and the data check information distinguished mutually with normal data formulated according to communications protocol.
Be preferably: the transmitting time of described Diagnosis of Links message is all carried out when the link data normal communication and during link idle in real time, and wherein the Diagnosis of Links message sends with normal data in the mode of inserting the normal data formation during link data normal communication of host node.
Be preferably: described Diagnosis of Links message and normal data message usage data type in data transmission format is distinguished.
The Diagnosis of Links message that utilization of the present invention and normal data distinguish regularly sends at host node with between the node, according to receiving and the time of feedback is judged the corresponding failure point, has greatly improved the timely discovery rate of fault.Fault detection method of the present invention so that Communication diagnostic can carry out in real time, no matter be that transfer of data or network idle phase are all carrying out; Call time on the communication failure controlled, controlled fault time to reporting links from finding link failure; Each node all can be diagnosed on transfer bus; In testing process, do not need extra diagnostic command or action, do not need manual operation to get final product the diagnosis communication link, do not need to increase extra hardware device or input yet.Diagnosis of the present invention does not affect the normal transmission of communication data.
Description of drawings
Fig. 1 method flow diagram of the present invention.
Embodiment
According to the OSI seven layer model definition of communication, network is defined as physical layer (Physical Layer), data link layer (Datalink Layer), network layer (Network Layer), transport layer (Transport Layer), session layer (Session Layer), presentation layer (Presentation Layer), application layer (Application Layer).The present invention is the purpose that reaches the real-time diagnosis link, therefore the data link layer (Datalink Layer) to master and slave node is carried out respective design on communications protocol, as shown in Figure 1, the fault monitoring method based on RS485 bus communication link of the present invention comprises the steps:
101, by the host node on the data link layer of RS485 bus communication link regularly to respectively sending with respectively from the Diagnosis of Links message of nodal information from node;
In the design of communications protocol link layer, (setting-up time can be according to the link communication speed every setting-up time for major node, system is to the self-defining that requires of link failure response time, take satisfy system to the link failure response time as principle) each is sent with the Diagnosis of Links message from node address information from node, the Diagnosis of Links message can be produced by the automatic trigger link layer of the diagnosis message timer of link layer, not controlled by the upper strata, timer carries out timing according to setting-up time, being sent in the normal data communication and all will carrying out in real time when idle of Diagnosis of Links message, when the normal data communication, the diagnosis message timer trigger link layer of link layer produces the Diagnosis of Links message, and link layer is inserted into the Diagnosis of Links message in the normal data transfer formation after the transmission of these frame data.Diagnosis of Links message and normal data message and other command messages usage data type in data transmission format is distinguished;
102, respectively after receiving corresponding diagnosis message, node sends with the Diagnosis of Links message from nodal information to host node immediately;
When the normal data communication, carry out packet parsing at the link layer from node receive the link packet of host node from node after, when from the link layer analytic message of node, be found to be the Diagnosis of Links message, then after these frame data are transmitted, when communication link is idle, reply Diagnosis of Links message from node to host node at once from the node link layer, and when not having normal data transfer idle, receive the Diagnosis of Links message of host node and after link layer is resolved from node, reply Diagnosis of Links message from node to host node at once from the node link layer.
103, in setting-up time, do not receive correspondingly behind the Diagnosis of Links message of node when host node, judge that namely there are fault in this link or this and carry out faulty indication and fault reports from node.
Master node link-layer starts this timer from node behind the node link diagnosis message and carries out timing (time of setting is according to link communication speed, the system self-defining that requires to the link failure response time sending to certain, take satisfy system to the link failure response time as principle), when master node link-layer is not received from the Diagnosis of Links message of node within the time of setting, be diagnosed as this and have fault from the node communication.Host node communication link layer transmission this moment information is notified the upper strata to communications protocol, and finally is delivered to application layer, and the host node system can carry out self-defining action or response according to application; The simultaneous communications link layer no longer carries out normal transfer of data to this from node, but the transmission of the diagnosis link packet of this node is not interrupted, and proceeds normal transfer of data until receive this diagnosis link packet from node
In the method for the present invention, wherein host node is independent calculating for each timing from node.In addition, host node to fault in the node reporting fault information, stop this transmission from the node normal data, but do not stop this Diagnosis of Links message from node is sent, until solve the transmission that this just carries out normal data behind the node failure.
The present invention also comprises from node failure active determining step: the time that regularly receives host node Diagnosis of Links message is being set from node, when in setting-up time, not receiving the Diagnosis of Links message of host node from node, judge that namely there are fault in this link or host node and carry out faulty indication and fault reports.
After the node startup, link layer uses and to carry out timing from the Diagnosis of Links timer of node (time of setting is according to the link communication speed, system is to the self-defining that requires of link failure response time, take satisfy system to the link failure response time as principle), overflow Diagnosis of Links message that can not or not receive host node within the time of namely setting from the link layer of node at timer, then be diagnosed as host node and have fault, notify upper strata to communications protocol from node communication link layer transmission information, and finally be delivered to application layer, can carry out self-defining action or response according to application from node system; If received the Diagnosis of Links message of host node before the Diagnosis of Links timer from the link layer of node does not overflow, this timer zero clearing re-starts the timing diagnosis.
Among the present invention the Diagnosis of Links message of host node comprise purpose from node address information, send the source address information of diagnosis message, data type and the data check information distinguished mutually with normal data of formulating according to communications protocol.From the Diagnosis of Links message of node comprise purpose host node address information, send the diagnosis message from node address information, data type and the data check information distinguished mutually with normal data formulated according to communications protocol.Particular content is as follows:
Send with the Diagnosis of Links message from node address information to host node immediately receive the Diagnosis of Links message of host node from node after.The form of host node transmission Diagnosis of Links message is as follows among the present invention:
| DA | SA | Type | CRC |
Wherein: DA is destination address, namely to diagnose from node address; SA is source address, i.e. host node address; The Type data type need to be that the Diagnosis of Links message is set Type according to the formulation of communications protocol, as: the Type value is 0X55AA during normal data transfer, and host node Diagnosis of Links message Type value is 0X8855; CRC is data check.
Sending the Diagnosis of Links message format from node is:
| DA | SA | Type | CRC |
Wherein: DA is destination address, i.e. host node address; SA is source address, namely from node address; The Type data type needs
Formulation according to communications protocol is that the Diagnosis of Links message is set Type, as: the Type value is 0X55AA during normal data transfer, is 0XAA88 from node link diagnosis message Type value; CRC is data check.
The transmitting time of link of the present invention diagnosis message is all carried out when the link data normal communication and during link idle in real time, and wherein the Diagnosis of Links message sends with normal data in the mode of inserting the normal data formation during link data normal communication of host node.Diagnosis of Links message and normal data message usage data type in data transmission format is distinguished.
The above only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, although the present invention discloses as above with preferred embodiment, yet be not to limit the present invention, anyly be familiar with the technical staff of this patent within not breaking away from the technical solution of the present invention scope, when the technology contents that can utilize above-mentioned prompting is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be the content that does not break away from technical solution of the present invention, any simple modification that foundation technical spirit of the present invention is done above embodiment, equivalent variations and modification all still belong in the present invention program's the scope.
Claims (8)
1. the fault monitoring method based on RS485 bus communication link is characterized in that, comprises the steps:
Step 1, by the host node on the data link layer of RS485 bus communication link regularly to respectively sending with respectively from the Diagnosis of Links message of nodal information from node;
Step 2, respectively receive behind the corresponding diagnosis message from node and send with the Diagnosis of Links message from nodal information to host node immediately;
Step 3, in setting-up time, do not receive correspondingly behind the Diagnosis of Links message of node when host node, judge that namely there are fault in this link or this and carry out faulty indication and fault reports from node.
2. fault monitoring method as claimed in claim 1 is characterized in that, wherein host node is independent calculating for each timing from node.
3. fault monitoring method as claimed in claim 1, it is characterized in that, described host node to fault in the node reporting fault information, stop this transmission from the node normal data, but do not stop this being sent from the Diagnosis of Links message of node, until solve the transmission that this just carries out normal data behind the node failure.
4. fault monitoring method as claimed in claim 1, it is characterized in that, also comprise from node failure active determining step: the time that regularly receives host node Diagnosis of Links message is being set from node, when in setting-up time, not receiving the Diagnosis of Links message of host node from node, judge that namely there are fault in this link or host node and carry out faulty indication and fault reports.
5. such as the described Arbitrary Fault monitoring method of claim 1-4, it is characterized in that, the Diagnosis of Links message of described host node comprise purpose from node address information, send the source address information of diagnosis message, data type and the data check information distinguished mutually with normal data of formulating according to communications protocol.
6. fault monitoring method as claimed in claim 5, it is characterized in that, described Diagnosis of Links message from node comprises purpose host node address information, send the diagnosis message from node address information, data type and the data check information distinguished mutually with normal data formulated according to communications protocol.
7. fault monitoring method as claimed in claim 6, it is characterized in that, the transmitting time of described Diagnosis of Links message is all carried out when the link data normal communication and during link idle in real time, and wherein the Diagnosis of Links message sends with normal data in the mode of inserting the normal data formation during link data normal communication of host node.
8. fault monitoring method as claimed in claim 7 is characterized in that, described Diagnosis of Links message and normal data message usage data type in data transmission format is distinguished.
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Cited By (17)
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| CN103475508A (en) * | 2013-08-29 | 2013-12-25 | 东方电气集团东方汽轮机有限公司 | Method for detecting fault points of wind field single-loop communication network |
| CN104104542A (en) * | 2014-07-16 | 2014-10-15 | 深圳市海亿达能源科技股份有限公司 | Real-time intelligent debugging method based on RS485 |
| CN104166391A (en) * | 2014-08-14 | 2014-11-26 | 成都联星微电子有限公司 | Cooperative multipoint industrial control acquisition fault monitoring system and method |
| CN104378275A (en) * | 2014-11-20 | 2015-02-25 | 中国船舶重工集团公司第七二六研究所 | Chrysanthemum chain type annular ownerless communication system |
| CN104780064A (en) * | 2015-03-31 | 2015-07-15 | 北京航天发射技术研究所 | Fault detection method of dual-redundancy-channel hot-switching CAN bus |
| CN104866399A (en) * | 2015-04-03 | 2015-08-26 | 张家祺 | UM-BUS bus channel fault detection controller and detection method |
| CN104954216A (en) * | 2014-03-31 | 2015-09-30 | 奇点新源国际技术开发(北京)有限公司 | 485 bus fault self-processing method and device |
| CN105099506A (en) * | 2015-08-21 | 2015-11-25 | 江阴长仪集团有限公司 | Electric energy meter RS485 communication failure detecting and self-healing device and method |
| CN105656656A (en) * | 2014-11-26 | 2016-06-08 | 上海协同科技股份有限公司 | RS485 communication circuit and fault detection method of nodes applying the circuit |
| CN106154071A (en) * | 2015-04-08 | 2016-11-23 | 深圳市科曼信息技术股份有限公司 | A kind of device and method detecting intelligent electric energy meter RS485 bus failure |
| CN106162707A (en) * | 2015-04-10 | 2016-11-23 | 富士通株式会社 | The monitoring method of aggregation node state, device and system |
| CN106254196A (en) * | 2016-08-31 | 2016-12-21 | 四川新环佳科技发展有限公司 | CAN safety monitoring method |
| CN107766200A (en) * | 2017-09-22 | 2018-03-06 | 郑州云海信息技术有限公司 | A kind of I2C monitoring bus system and monitoring method |
| CN109840235A (en) * | 2017-11-27 | 2019-06-04 | 中国航空工业集团公司西安航空计算技术研究所 | A kind of airborne computer RS422 bus data method of reseptance |
| CN110430107A (en) * | 2019-07-29 | 2019-11-08 | 珠海格力电器股份有限公司 | Communicate response rate display methods and device |
| CN112241157A (en) * | 2020-09-04 | 2021-01-19 | 北京新能源汽车技术创新中心有限公司 | Loopback testing device and method for diagnosing communication link fault of vehicle central gateway |
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| CN103475508A (en) * | 2013-08-29 | 2013-12-25 | 东方电气集团东方汽轮机有限公司 | Method for detecting fault points of wind field single-loop communication network |
| CN104954216A (en) * | 2014-03-31 | 2015-09-30 | 奇点新源国际技术开发(北京)有限公司 | 485 bus fault self-processing method and device |
| CN104104542A (en) * | 2014-07-16 | 2014-10-15 | 深圳市海亿达能源科技股份有限公司 | Real-time intelligent debugging method based on RS485 |
| CN104104542B (en) * | 2014-07-16 | 2017-11-03 | 深圳市海亿达能源科技股份有限公司 | RS 485-based real-time intelligent obstacle removing method |
| CN104166391A (en) * | 2014-08-14 | 2014-11-26 | 成都联星微电子有限公司 | Cooperative multipoint industrial control acquisition fault monitoring system and method |
| CN104378275B (en) * | 2014-11-20 | 2017-10-10 | 中国船舶重工集团公司第七二六研究所 | Daisy chain type annular is without main communication system |
| CN104378275A (en) * | 2014-11-20 | 2015-02-25 | 中国船舶重工集团公司第七二六研究所 | Chrysanthemum chain type annular ownerless communication system |
| CN105656656A (en) * | 2014-11-26 | 2016-06-08 | 上海协同科技股份有限公司 | RS485 communication circuit and fault detection method of nodes applying the circuit |
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| CN104866399B (en) * | 2015-04-03 | 2019-07-09 | 张家祺 | UM-BUS bus run Failure Detection Controller and detection method |
| CN106154071B (en) * | 2015-04-08 | 2018-12-11 | 国网安徽省电力公司 | A kind of device and method detecting intelligent electric energy meter RS485 bus failure |
| CN106154071A (en) * | 2015-04-08 | 2016-11-23 | 深圳市科曼信息技术股份有限公司 | A kind of device and method detecting intelligent electric energy meter RS485 bus failure |
| CN106162707A (en) * | 2015-04-10 | 2016-11-23 | 富士通株式会社 | The monitoring method of aggregation node state, device and system |
| CN105099506A (en) * | 2015-08-21 | 2015-11-25 | 江阴长仪集团有限公司 | Electric energy meter RS485 communication failure detecting and self-healing device and method |
| CN106254196A (en) * | 2016-08-31 | 2016-12-21 | 四川新环佳科技发展有限公司 | CAN safety monitoring method |
| CN107766200A (en) * | 2017-09-22 | 2018-03-06 | 郑州云海信息技术有限公司 | A kind of I2C monitoring bus system and monitoring method |
| CN109840235A (en) * | 2017-11-27 | 2019-06-04 | 中国航空工业集团公司西安航空计算技术研究所 | A kind of airborne computer RS422 bus data method of reseptance |
| CN110430107A (en) * | 2019-07-29 | 2019-11-08 | 珠海格力电器股份有限公司 | Communicate response rate display methods and device |
| CN112566307A (en) * | 2019-09-10 | 2021-03-26 | 酷矽半导体科技(上海)有限公司 | Safety display system and safety display method |
| CN112241157A (en) * | 2020-09-04 | 2021-01-19 | 北京新能源汽车技术创新中心有限公司 | Loopback testing device and method for diagnosing communication link fault of vehicle central gateway |
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