CN113746713A - Asynchronous serial bus dynamic configuration method capable of improving communication reliability - Google Patents
Asynchronous serial bus dynamic configuration method capable of improving communication reliability Download PDFInfo
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- CN113746713A CN113746713A CN202111038334.4A CN202111038334A CN113746713A CN 113746713 A CN113746713 A CN 113746713A CN 202111038334 A CN202111038334 A CN 202111038334A CN 113746713 A CN113746713 A CN 113746713A
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/22—Arrangements for detecting or preventing errors in the information received using redundant apparatus to increase reliability
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0654—Management of faults, events, alarms or notifications using network fault recovery
- H04L41/0663—Performing the actions predefined by failover planning, e.g. switching to standby network elements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
Abstract
The invention discloses an asynchronous serial bus dynamic configuration method capable of improving communication reliability, which comprises the following steps: after the power is on, the asynchronous serial bus interface works in an RS422 full-duplex communication mode by default; when a communication line fault is monitored, the asynchronous serial bus interface is controlled to be switched to a redundant RS485 bus working mode, both sides of the node at the stage inquire and confirm on a normal line, and the asynchronous serial bus interface is controlled to be switched to an RS485 half-duplex communication mode; the two nodes perform RS485 half-duplex communication clearance and perform inquiry confirmation on a fault line until the communication line is recovered to be normal; after both sides of the node inquire and confirm, the asynchronous serial bus interface is controlled to be switched to the RS422 full duplex communication mode. The method provided by the invention switches the RS422 bus into RS485 dual-redundancy communication without increasing communication lines, thereby improving the reliability of asynchronous bus communication.
Description
Technical Field
The invention belongs to the technical field of buses, and particularly relates to an asynchronous serial bus dynamic configuration method capable of improving communication reliability.
Background
Asynchronous serial buses are typically implemented as RS232, RS422, or RS485 levels. The RS422/485 adopts differential signal transmission, has the characteristics of strong anti-interference capability, high transmission rate and long communication distance, and is widely applied.
The RS422 is full duplex communication, 4 signal lines are used for point-to-point communication, and more signals need to be connected; RS485 is half duplex communication, uses 2 signal lines to transmit, and also can be used for multi-node networking communication, but the bandwidth is reduced by half. The RS485 bus needs to perform bus transceiving control, the communication process is complex, and bus signal collision is easily caused by multi-node communication.
No matter RS422 or RS485, the disconnection of any one signal line in the bus or the short circuit between the differential pair lines can cause the communication interruption and the recovery, and the communication reliability is low.
The RS422/485 has the same level standard, mainly the difference of full duplex/half duplex, in some cases, the receiving and transmitting lines of the RS422 driver are connected in parallel, thereby realizing an RS485 bus; the RS485 driver is configured to receive only and transmit only, respectively, and the RS422 bus can also be implemented.
After the bus connection is configured, the bus can only operate according to a fixed working mode generally, cannot be dynamically changed, and has poor adaptability to fault scenes.
Disclosure of Invention
In order to solve the problem that the existing bus has poor adaptability to fault scenes, the invention provides an asynchronous serial bus dynamic configuration method capable of improving communication reliability. The invention enables the asynchronous bus to be dynamically switched in the RS422/RS485 mode.
The invention is realized by the following technical scheme:
the asynchronous serial bus dynamic configuration method capable of improving communication reliability comprises the following steps:
after the power is on, the asynchronous serial bus interface works in an RS422 full-duplex communication mode by default;
when a communication line fault is monitored, the asynchronous serial bus interface is controlled to be switched to a redundant RS485 bus working mode, both sides of the node at the stage inquire and confirm on a normal line, and the asynchronous serial bus interface is controlled to be switched to an RS485 half-duplex communication mode;
the two nodes perform RS485 half-duplex communication clearance and perform inquiry confirmation on a fault line until the communication line is recovered to be normal;
after both sides of the node inquire and confirm, the asynchronous serial bus interface is controlled to be switched to the RS422 full duplex communication mode.
Preferably, the inquiry confirmation is performed on the normal line by both sides of the node of the invention, and the specific step of controlling the asynchronous serial bus interface to be switched to the RS485 half-duplex communication mode is as follows:
both nodes initiate an LIVE inquiry command to the other side on 2 lines at random intervals;
if the node A successfully receives the inquiry command, the channel of the line is judged to be normal;
at the moment, the node A stops randomly initiating LIVE inquiry on a normal line, and periodically sends LIVEACK reply to the opposite node B;
after receiving LIVEACK, the opposite node B immediately stops randomly initiating LIVE inquiry on the normal line and sends LIVEACK, and then enters an RS485 communication slave mode;
after receiving LIVEACK returned by the opposite node B, the node A enters an RS485 communication host mode;
node a and correspondent node B perform half-duplex communication on a normal line.
Preferably, the method of the present invention further includes, after the steps of performing inquiry confirmation on normal lines by both nodes and controlling the asynchronous serial bus interface to switch to the RS485 half-duplex communication mode:
and carrying out fault identification on the fault line, and reporting the bus fault to an upper computer.
Preferably, the querying and confirming of the two nodes of the present invention on the fault line until the communication line is recovered to normal specifically comprises:
both sides of the node send LIVE inquiry on a fault line at random intervals;
when the node A receives the LIVE inquiry on the line marked as the fault, the node A stops the random LIVE inquiry on the line and periodically sends LIVEACK reply to the opposite node B;
after receiving LIVEACK, the opposite node B immediately stops the random LIVE inquiry on the channel and sends LIVEACK;
after receiving LIVEACK returned from the opposite end, the node A indicates that the communication line is recovered to be normal.
Preferably, after both the nodes of the present invention perform inquiry confirmation, the step of controlling the asynchronous serial bus interface to switch to the RS422 full duplex communication mode specifically includes:
the node sends LIVE command to the opposite terminal in two directions, and confirms that the bus is recovered to normal when LIVEACK sent back by the opposite terminal is received;
and both nodes quit the RS485 communication mode through the negotiation of the RS485 bus, switch to the RS422 full duplex communication mode and clear the fault identification.
Preferably, the asynchronous serial bus interface of the present invention adopts a full-duplex communication interface composed of 2 MAX 485.
The invention has the following advantages and beneficial effects:
according to the method provided by the invention, the RS422 bus is switched to RS485 dual-redundancy communication without increasing a communication line, so that the reliability of asynchronous bus communication is improved, effective communication is still kept under the condition that part of the communication line is damaged, and the fault scene adaptability is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic diagram of an asynchronous serial bus interface according to the present invention.
FIG. 2 is a schematic flow chart of the method of the present invention.
Detailed Description
Hereinafter, the term "comprising" or "may include" used in various embodiments of the present invention indicates the presence of the invented function, operation or element, and does not limit the addition of one or more functions, operations or elements. Furthermore, as used in various embodiments of the present invention, the terms "comprises," "comprising," "includes," "including," "has," "having" and their derivatives are intended to mean that the specified features, numbers, steps, operations, elements, components, or combinations of the foregoing, are only meant to indicate that a particular feature, number, step, operation, element, component, or combination of the foregoing, and should not be construed as first excluding the existence of, or adding to the possibility of, one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing.
In various embodiments of the invention, the expression "or" at least one of a or/and B "includes any or all combinations of the words listed simultaneously. For example, the expression "a or B" or "at least one of a or/and B" may include a, may include B, or may include both a and B.
Expressions (such as "first", "second", and the like) used in various embodiments of the present invention may modify various constituent elements in various embodiments, but may not limit the respective constituent elements. For example, the above description does not limit the order and/or importance of the elements described. The foregoing description is for the purpose of distinguishing one element from another. For example, the first user device and the second user device indicate different user devices, although both are user devices. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of various embodiments of the present invention.
It should be noted that: if it is described that one constituent element is "connected" to another constituent element, the first constituent element may be directly connected to the second constituent element, and a third constituent element may be "connected" between the first constituent element and the second constituent element. In contrast, when one constituent element is "directly connected" to another constituent element, it is understood that there is no third constituent element between the first constituent element and the second constituent element.
The terminology used in the various embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the various embodiments of the invention. As used herein, the singular forms are intended to include the plural forms as well, unless the context clearly indicates otherwise. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which various embodiments of the present invention belong. The terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning that is consistent with their contextual meaning in the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein in various embodiments of the present invention.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Examples
The embodiment provides an asynchronous serial bus dynamic configuration method capable of improving communication reliability, as shown in fig. 2, including the following steps:
And 2, when a communication line fault is detected, controlling the working mode of the bus to be switched into the working mode of the redundant RS485 bus, and initiating a LIVE inquiry command to the opposite side by the two nodes on the 2 buses at random intervals.
And 4, the node B enters an RS485 communication slave mode subsequently, and the node A enters an RS485 communication host mode after receiving LIVEACK returned by the opposite terminal.
And step 5, carrying out half-duplex communication on the normal RS485 bus by the node A and the node B, reporting the bus fault to the system, and carrying out fault identification on the fault bus.
And 6, in the interval of RS485 communication, the node A and the node B still send LIVE inquiry on the fault bus at random intervals.
And 7, after the communication line is recovered, the node receives the LIVE inquiry on the RS485 bus channel which is identified as the fault, the confirmation is carried out according to the step 4, and after both sides receive LIVEACK, the communication link is recovered to be normal, and the RS422 full duplex communication can be converted.
And 8, the node A and the node B quit the RS485 communication mode through the negotiation of the RS485 bus and switch to the RS422 working mode.
And 9, sending a LIVE command to the opposite end in both directions, and receiving LIVEACK to confirm that the bus is recovered to be normal.
And step 10, carrying out full duplex communication by the node A and the node B in an RS422 mode, and clearing the fault identification.
The system of the embodiment specifically comprises an upper computer, an asynchronous serial bus interface and a monitoring module;
as shown in fig. 1, the asynchronous serial bus interface adopts a full-duplex communication mode, namely an RS422 bus communication mode, composed of 2 MAX485(RS485 bus communication modes) in a node, namely, under a normal communication mode, an RS422 full-duplex communication mode (line 1 and line 2) is adopted between the node and the node; monitoring a communication line by a monitoring module and sending a monitoring signal to an upper computer, when a fault of the communication line is monitored, the upper computer sends a control command to switch an asynchronous serial bus interface communication mode into a redundant RS485 mode, both nodes carry out LIVE inquiry confirmation, the upper computer sends a control command to switch the asynchronous serial bus interface communication mode into a normal RS485 mode to carry out half-duplex communication, a fault line is identified and reported until the fault line is recovered to be normal, the upper computer sends a control command to switch the asynchronous serial bus interface communication mode into RS422 full-duplex communication, and a fault identifier is cleared.
The node operation mode of this embodiment is shown in table 1 below.
As can be seen from Table 1:
the upper computer sends a '0011' control command, the asynchronous serial bus interface communication mode is an RS422 full duplex mode, line 1 sends, and line 2 receives.
The upper computer sends a '1011' control command, and the communication mode of the asynchronous serial bus interface is an RS485 mode: line 1 sends and line 2 closes.
The upper computer sends a '1000' control command, the communication mode of the asynchronous serial bus interface is an RS485 mode, the line 1 receives the command, and the line 2 is closed.
The upper computer sends a '1110' control command, the communication mode of the asynchronous serial bus interface is an RS485 mode, the line 2 sends the command, and the line 1 is closed.
The upper computer sends a '0010' control command, the communication mode of the asynchronous serial bus interface is an RS485 mode, the circuit 2 receives the command, and the circuit 1 is closed.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. The asynchronous serial bus dynamic configuration method capable of improving communication reliability is characterized by comprising the following steps:
after the power is on, the asynchronous serial bus interface works in an RS422 full-duplex communication mode by default;
when a communication line fault is monitored, the asynchronous serial bus interface is controlled to be switched to a redundant RS485 bus working mode, both sides of the node at the stage inquire and confirm on a normal line, and the asynchronous serial bus interface is controlled to be switched to an RS485 half-duplex communication mode;
the two nodes perform RS485 half-duplex communication clearance and perform inquiry confirmation on a fault line until the communication line is recovered to be normal;
after both sides of the node inquire and confirm, the asynchronous serial bus interface is controlled to be switched to the RS422 full duplex communication mode.
2. The method for dynamically configuring the asynchronous serial bus capable of improving the communication reliability as claimed in claim 1, wherein the step of performing inquiry confirmation on the normal line by both nodes and controlling the asynchronous serial bus interface to switch to the RS485 half-duplex communication mode specifically comprises:
both nodes initiate an LIVE inquiry command to the other side on 2 lines at random intervals;
if the node A successfully receives the inquiry command, the channel of the line is judged to be normal;
at the moment, the node A stops randomly initiating LIVE inquiry on a normal line, and periodically sends LIVEACK reply to the opposite node B;
after receiving LIVEACK, the opposite node B immediately stops randomly initiating LIVE inquiry on the normal line and sends LIVEACK, and then enters an RS485 communication slave mode;
after receiving LIVEACK returned by the opposite node B, the node A enters an RS485 communication host mode;
node a and correspondent node B perform half-duplex communication on a normal line.
3. The method as claimed in claim 1 or 2, wherein the step of performing inquiry confirmation on the normal line by both nodes and controlling the asynchronous serial bus interface to switch to the RS485 half-duplex communication mode further comprises:
and carrying out fault identification on the fault line, and reporting the bus fault to an upper computer.
4. The method for dynamically configuring asynchronous serial bus capable of improving communication reliability as claimed in claim 3, wherein the query confirmation is performed on the faulty line by both nodes until the communication line returns to normal, specifically:
both sides of the node send LIVE inquiry on a fault line at random intervals;
when the node A receives the LIVE inquiry on the line marked as the fault, the node A stops the random LIVE inquiry on the line and periodically sends LIVEACK reply to the opposite node B;
after receiving LIVEACK, the opposite node B immediately stops the random LIVE inquiry on the channel and sends LIVEACK;
after receiving LIVEACK returned from the opposite end, the node A indicates that the communication line is recovered to be normal.
5. The method for dynamically configuring an asynchronous serial bus capable of improving communication reliability as claimed in claim 3, wherein the step of controlling the asynchronous serial bus interface to switch to the RS422 full duplex communication mode after both nodes perform inquiry confirmation specifically comprises:
the node sends LIVE command to the opposite terminal in two directions, and confirms that the bus is recovered to normal when LIVEACK sent back by the opposite terminal is received;
and both nodes quit the RS485 communication mode through the negotiation of the RS485 bus, switch to the RS422 full duplex communication mode and clear the fault identification.
6. The dynamic configuration method for asynchronous serial bus capable of improving communication reliability as claimed in claim 1, wherein said asynchronous serial bus interface is a full duplex communication interface consisting of 2 MAX485 interfaces.
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