CN106610905A - Assistant selection local area network interface system and communication method thereof - Google Patents
Assistant selection local area network interface system and communication method thereof Download PDFInfo
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- CN106610905A CN106610905A CN201510701577.XA CN201510701577A CN106610905A CN 106610905 A CN106610905 A CN 106610905A CN 201510701577 A CN201510701577 A CN 201510701577A CN 106610905 A CN106610905 A CN 106610905A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/14—Handling requests for interconnection or transfer
- G06F13/36—Handling requests for interconnection or transfer for access to common bus or bus system
- G06F13/362—Handling requests for interconnection or transfer for access to common bus or bus system with centralised access control
Abstract
The invention relates to a local area network interface model, and specifically relates to an assistant selection local area network interface system and a communication method thereof. The system comprises a hardware module and a software module, and one host can establish communication links with a plurality of slaves via the system of the invention; the hardware module comprises a communication bus and a plurality of auxiliary I/O interface modules which are corresponding to the plurality of slaves one to one; hardware of the communication bus comprises a level conversion chip and a corresponding matching resistor; software of the communication bus comprises a transmitting and receiving program unit using a UART (Universal Asynchronous Receiver/Transmitter); the auxiliary I/O interface modules comprise I/O interface lines; and the software module comprises a communication time slot timer and a communication fault counter. The system provided by the invention and the communication method established based on the system have better compatibility and stability in the actual running process.
Description
Technical field
The present invention relates to a kind of lan interfaces model, specifically, is related to a kind of assisted Selection LAN and connects
Port system and its communication means.
Background technology
At present, it is to set up a kind of half-duplex meter communication network based on various communication interfaces such as such as RS-485,
Although use range is extremely extensive, hardware interface is but only included, without secondary communication protocol.So as to cause
The software for being communicated on this basis may have no problem when unit communication is carried out, but once networking
The problems such as having bus conflict, communicate locked.
For the problems referred to above, existing Part Development person can select to enter software using such as MODBUS agreements
Row exploitation, but this need it is very familiar to this quasi-protocol itself, for the people for not using this quasi-protocol
For, not only need to learn this quasi-protocol, in addition it is also necessary to be repeated using test, so as to cause
Construction cycle is long, and this is that current rapid product development institute is unallowable.Apart from the above, using for example
The software of MODBUS protocol developments can also when existing being provided without in the equipment of same protocol exploitation is applied to
Produce compatibility issue.In sum, under the restriction of existing communication mechanism, assigned personnel are entering to software
During row exploitation, it is difficult to obtain better balance between compatibility and operation stability.
The content of the invention
The drawbacks of in order to overcome existing local area network communication mechanism, improve the development rate of Related product, drop
The technical threshold of low developer, while the stability of improving product, the invention provides a kind of assisted Selection
Lan interfaces system, its can by multiple auxiliary I/O interface modules (the hardware I/O port of auxiliary) with
Multiple slaves are corresponded such that it is able to preferably selected the slave for needing communication or inquired about a certain slave
Communications status, and then can preferably ensure the communication uniqueness of same minimum time slot internal bus.Energy of the present invention
It is enough to be preferably applied to RS-485 buses, CAN etc..
Assisted Selection lan interfaces system of the invention, it is included for realizing main frame and at least one
The data/address bus of data transfer between slave, and at least one slave to be respectively connected to into main frame extremely
Few a pair of auxiliary I/O interface modules.
Multiple slaves preferably can be accessed in a main frame to set up a local Netcom by the system of the present invention
News network, can correspondingly be provided with an auxiliary I/O interface module wherein at each slave, so that
By dragging down or drawing high auxiliary I/O interface modules, you can preferably select a unique communication in a certain amount of time
Link, so as to ensure that the stability of the data transfer between multiple slaves and main frame, and because it need not be adopted
Software is developed with other agreement (such as MODBUS agreements), is so as to also cause the present invention
System is not in compatibility issue when local area network communication is applied to.
In the system of the present invention, data/address bus can be such as RS-485 communication bus, CAN communication bus etc.
Various buses such that it is able in preferably applying to various existing equipment, so as to greatly reduce exploit person
The technical threshold of member.In the system of the present invention, the hardware of data/address bus can include such as electrical level transferring chip,
Build-out resistor etc., the software of data/address bus can send including such as universal asynchronous receiving-transmitting transmitter (UART)
With the program of reception.
In the system of the present invention, auxiliary I/O interface modules can include I/O mouth lines, and aid in I/O interface moulds
Block can be controlled by communication initiator, and the detection mode of auxiliary I/O interface modules can be adopted for example interrupts
Detection, poll detection etc. such that it is able to be applied to randomness communication mode or rule preferably according to communication requirement
Rule property communication mode.
Preferably, the system of the present invention can also include communication slot timer and communication failure enumerator,
Communication slot timer is used to define the single communication time upper limit, appointing between main frame and at least one slave
Then assert when call duration time exceedes the single communication time upper limit for one time and this time communicate as communication failure, communication failure
Enumerator is used for the number of times to there is communication failure in single communication and counts.
In the system of the present invention, communicating the timing of slot timer can be set as 1.5～3 times of positive normal open
Letter duration, by using communication slot timer, being controlled to single communication time so that exceed
The communication of timing is judged to communication failure preferably to carry out subsequent treatment such that it is able to preferably carry
High communication efficiency.In the system of the present invention, additionally it is possible to using such as communication failure enumerator to single communication event
The number of times of barrier is counted, so as to provide determinating reference for subsequent treatment.
The present invention system in, if data it is ageing higher and not high to data integrity demands when, energy
It is enough that selection crocodile, and the control node (slave) after the number of stoppages is more than 5 times are carried out to communication failure enumerator
Dormancy, is spaced after a certain setting time and restarts the node (slave), to continue to complete communication such that it is able to
Preferably ensure the relatively high-timeliness transmission of data.If the integrity demands of sent data are higher and can neglect
Communication failure counter records communication failure number of times is may be selected when slightly ageing, to wait node (slave) to ring
Ying Hou, retransmission data such that it is able to preferably ensure the integrity transmission of data.In addition, in the system
Communication failure enumerator can be cleared after node (slave) dormancy or after retransmission data or after the completion of communication,
So that it preferably individually can communicate to single recording.
The drawbacks of in order to overcome existing local area network communication mechanism, the present invention additionally provides one kind and is based on simultaneously
The communication means of the key network that any of the above-described system is set up, its can preferably based on control main frame, with
Machine selects any one subordinate computer node to be communicated.In the communication means of the key network in the present invention, institute
Some communication starts all to be by main frame initiation, the instruction (data) of the passive Receiving Host of slave.
The communication means of key network of the invention, including by least one slave by said system with
The step of one main frame sets up key network, wherein, main frame is to energy during arbitrary slave (node) transmission data
Enough comprise the following steps：
(1) main frame draws high auxiliary I/O interface modules corresponding with the slave；
(2) slave is being detected after correspondence auxiliary I/O interface modules are driven high to the reply of main frame transmission first
Response；
(3) main frame sends data after the first reply response is received to the slave；
(4) slave sends first and replys and confirms after data have been received to main frame；
(5) main frame drags down correspondence auxiliary I/O interface modules, this communication after the first reply confirmation is received
Terminate.
In the communication means of the key network of the present invention, main frame can carry out instruction setting using polling mechanism,
Slave can be using detection be interrupted, so that main frame preferably can send data to arbitrary slave.Pass through
The communication means of the key network of the present invention so that ensure that communication between main frame and slave at any time
Unicity, so as to preferably avoid bus conflict present in prior art, communicate it is locked the problems such as, preferably
Ensure that the stability of communication.
Preferably, in step (1), main frame opens one to be used to define the logical of the single communication time upper limit simultaneously
News slot timer, main frame does not receive the first reply response or the first reply in the single communication time upper limit
Then assert that this communication is communication failure during confirmation, and using a communication failure enumerator to this communication failure
Number of times is counted.
In the communication means of the key network of the present invention, can be by communication slot timer and communication failure meter
Number device carries out prosecution to arbitrary communication process such that it is able to preferably ensure the timeliness in data transmission procedure
Property or integrity.
Preferably, this communication failure number of times is when within 2 times, main frame sends data to the slave again；
Otherwise, main frame forces to drag down correspondence auxiliary I/O interface modules to terminate this communication, while to communication failure meter
Number device is zeroed out.
In the communication means of the key network of the present invention, communication failure can be set when within 2 times to communication
Failure carries out ignoring repeating transmission and communication failure enumerator does not reset such that it is able to take into account communication efficiency and data are complete
Whole property.
Preferably, the single communication time upper limit is set as 1.5～3 times of proper communication durations.
In the communication means of the key network of the present invention, the single communication time upper limit can be set as 1.5～3 times just
Normal communication time such that it is able to the erroneous judgement for preferably avoiding waiting for overlong time or causing because of network stabilization.
The drawbacks of in order to overcome existing local area network communication mechanism, the present invention additionally provides one kind and is based on simultaneously
The communication means of the monitoring network that any of the above-described system is set up, its can preferably with the information of slave at
Based on reason, at any time the data gathered from chance are issued into main frame.In the communication means of the monitoring network of the present invention,
Arbitrary communication is initiated by slave (node), main frame passive response.
It is of the invention monitor network communication means, including by least one slave by above-mentioned system
The step of monitoring network is set up with a main frame, wherein, arbitrary slave includes following when sending data to main frame
Step：
Step one, the slave draws high corresponding auxiliary I/O interface module；
Step 2, main frame detect correspondence auxiliary I/O interface modules be driven high after, if without other communication process
Then send second to the slave and reply response, second is sent to the slave otherwise after other communication process terminate
Reply response；
Step 3, the slave sends data after the second reply response is received to main frame；
Step 4, main frame sends second and replys and confirms after data have been received to the slave；
Step 5, the slave drags down correspondence auxiliary I/O interface modules after the second reply confirmation is received, this
Sign off.
In the communication means of the monitoring network of the present invention, main frame can adopt interruption detection random to carry out data
Integrity is received, and slave can carry out random data integrity data transmission using polling mechanism；In addition, main
Machine and slave also can carry out regular data age transmission using poll detection.By the prison of the present invention
The communication means of auditory network so that ensure that communication unicity between main frame and slave at any time, from
And preferably avoid bus conflict present in prior art, communicate it is locked the problems such as, preferably ensure that logical
The stability of news.
Preferably, in step one, the slave opens one to be used to define the logical of the single communication time upper limit simultaneously
News slot timer, the slave does not receive the second reply response or second time in the single communication time upper limit
Then assert that this communication is communication failure when confirming again, and using a communication failure enumerator to this communication event
Barrier number of times is counted.
In the communication means of the monitoring network of the present invention, can be by communication slot timer and communication failure meter
Number device carries out prosecution to arbitrary communication process such that it is able to preferably ensure the timeliness in data transmission procedure
Property or integrity.
Preferably, this communication failure number of times is when within 2 times, the slave sends data to main frame again；
Otherwise, the slave forces to drag down correspondence auxiliary I/O interface modules to terminate this communication, while to communication failure
Enumerator is zeroed out.
In the communication means of the monitoring network of the present invention, communication failure can be set when within 2 times to communication
Failure carries out ignoring repeating transmission and communication failure enumerator does not reset, otherwise again to main frame transmission data and to logical
News failure counter resets such that it is able to take into account the integrity of data and ageing.
Preferably, the single communication time upper limit is set as 1.5～3 times of proper communication durations.
In the communication means of the monitoring network of the present invention, the single communication time upper limit can be set as 1.5～3 times just
Normal communication time such that it is able to the erroneous judgement for preferably avoiding waiting for overlong time or causing because of network stabilization.
Description of the drawings
Fig. 1 is the hierarchical structure schematic diagram of assisted Selection lan interfaces system in embodiment 1；
Fig. 2 is that assisted Selection lan interfaces system communicates the place of answer party in practical communication in embodiment 1
Reason schematic flow sheet；
Fig. 3 is the place of assisted Selection lan interfaces system communication initiator in practical communication in embodiment 1
Reason schematic flow sheet；
Fig. 4 is the system block diagram of LAN communication system in embodiment 2.
Specific embodiment
To further appreciate that present disclosure, in conjunction with the accompanying drawings and embodiments the present invention is described in detail.Should
When being understood by, embodiment be only the present invention is explained and and it is non-limiting.
Embodiment 1
As shown in figure 1, present embodiments providing a kind of assisted Selection lan interfaces system, it includes hardware
Module and software module.Wherein, a main frame can be set up by the system in the present embodiment with multiple slaves
Communication link.
In the present embodiment, hardware module include communication bus and with one-to-one multiple auxiliary I/O of multiple slaves
Interface module, the hardware of communication bus includes electrical level transferring chip and corresponding build-out resistor, communication bus
Software includes sending and receiving program unit using UART, and auxiliary I/O interface modules include I/O mouth lines.It is soft
Part module includes communication slot timer and communication failure enumerator,
In the present embodiment, multiple slaves with its one-to-one multiple auxiliary I/O interface module respectively by accessing
Communication bus, communication bus access host.In addition, communication slot timer is used to define single communication time
The upper limit, and the single communication time upper limit can be set as 1.5～3 times of (being 2 times in the present embodiment) proper communications
Duration, arbitrary call duration time between main frame and arbitrary slave then assert this when exceeding the single communication time upper limit
Secondary communication is communication failure, and communication failure enumerator is used for the number of times to there is communication failure in single communication and enters
Row numeration.
The system of the present embodiment in practice, can to each auxiliary I/O interface modules be encoded and
This coding is corresponded with the address code of multiple slaves, so that communication initiator can preferably pair and institute
The corresponding auxiliary I/O interface modules of slave that need to carry out data transmission carry out drawing high operation.In the present embodiment, lead to
The data frame format such as table 1 (as follows) of letter initiator, communication receiver is receiving communication initiator's
Response can be carried out to communication initiator during instruction (i.e. corresponding I/O mouth lines are driven high), wherein replying
The form of frame such as table 2 (as follows).
It should be noted that Tables 1 and 2 only gives Frame and one kind of response frame format is embodied as
Mode, only for explaining to the present embodiment, is unable to any limit for being interpreted as carrying out the present invention
It is fixed.
Table 1：
Table 2：
| Frame head | Answer back code 1 | Answer back code 2 | Postamble |
| AA | 0 | K | XX |
As shown in Figure 2 and Figure 3, when carrying out local area network communication with the system of the present embodiment, can be sent out by communication
Play side's (main frame or a certain slave) to draw high corresponding I/O mouth lines and open communication slot timer simultaneously, accordingly
Communication answer party (communication initiator then communicates answer party for corresponding slave for main frame, and communication initiator is
A certain slave then communicates answer party for main frame) detecting when corresponding I/O mouth lines are driven high i.e. to communication initiation
Side sends acknowledgement frame, and communication initiator sends Frame after acknowledgement frame is received to communication answer party,
After data receiver is finished, communication response direction communication initiator sends data response frame, and communication initiator is connecing
Receive and I/O mouth lines will be dragged down accordingly after data response frame, so as to terminate this communication.From the foregoing,
The system of the present embodiment can preferably ensure the communication uniqueness in arbitrary period.
In addition, in above process, if communication initiator is after communication is initiated, in communication slot timer institute
Response (acknowledgement frame or the data of communication answer party are not received in the time (the single communication time upper limit) of timing
Echo Frame), then this communication is judged to communication failure and is write in communication failure enumerator.Communication initiator
After communication failure is judged, (pressure drags down response I/O mouths can be immediately finished this communication according to actual requirement
Line) and to communication failure counter O reset；Or one communication failure number of times upper limit of setting, work as the number of stoppages
Set the number of stoppages upper limit in when, restart communication slot timer with continue waiting for communicate answer party response and
Not to communication failure counter O reset, when the number of stoppages is more than the setting number of stoppages upper limit, terminates this time and lead to
Believe (pressure drags down response I/O mouth lines) and to communication failure counter O reset.From the above mentioned, it is known that this enforcement
The system of example can be required according to actual production and the ageing transmission and integrity transmission to data is laid particular stress on
Select, and preferably communication efficiency can be brought.
Embodiment 2
As shown in figure 4, present embodiments providing a kind of environment of system based in embodiment 1 in RS-485
The LAN communication system of lower structure.
In the present embodiment, communication bus is RS-485 buses, and the MCU of main frame adopts STM32F103RBT6,
Main frame is connected by MAX485 chips with RS-485 buses；The number of slave be 4 (it should be noted that
Herein slave number is only a kind of specific embodiment, rather than to any restriction for being carried out of the invention), institute
There is the MCU of slave using STM32F103RBT6, all slaves are connect using a MAX485 chips
Enter RS-485 buses, and arbitrary slave is connected using a pair of auxiliary I/O interface modules with main frame.
In the present embodiment, main frame sends instruction (data) using polling mode, and slave is using interrupt mode to auxiliary
I/O interface modules are helped to be detected, so that slave once receives the instruction (data) of main frame transmission i.e.
The instruction (data) is processed.
In the present embodiment, the single communication time upper limit is set as 10ms, the count value of communication failure enumerator exists
Data are retransmitted when within 2 times, is otherwise reported slave failure and is terminated this communication simultaneously to communication failure meter
Number device resets.
Embodiment 3
A kind of communication means of the key network set up based on system in embodiment 1 is provided in the present embodiment,
Wherein, comprise the following steps when main frame sends data to arbitrary slave：
(1) main frame draws high auxiliary I/O interface modules corresponding with the slave；
(2) slave is being detected after correspondence auxiliary I/O interface modules are driven high to the reply of main frame transmission first
Response；
(3) main frame sends data after the first reply response is received to the slave；
(4) slave sends first and replys and confirms after data have been received to main frame；
(5) main frame drags down correspondence auxiliary I/O interface modules, this communication after the first reply confirmation is received
Terminate.
In the present embodiment, in step (1), main frame opens one simultaneously to be used to define the single communication time upper limit
Communication slot timer, main frame does not receive the first reply response or first time in the single communication time upper limit
Then assert that this communication is communication failure when confirming again, and using a communication failure enumerator to this communication event
Barrier number of times is counted.When within 2 times, main frame sends number to this communication failure number of times to the slave again
According to；Otherwise, main frame forces to drag down correspondence auxiliary I/O interface modules to terminate this communication, while to communication event
Barrier enumerator is zeroed out.
In the present embodiment, the single communication time upper limit is set as 2.5 times of proper communication durations.
Embodiment 4
A kind of communication means of the monitoring network set up based on system in embodiment 1 is provided in the present embodiment,
Wherein, comprise the following steps when arbitrary slave sends data to main frame：
Step one, the slave draws high corresponding auxiliary I/O interface module；
Step 2, main frame detect correspondence auxiliary I/O interface modules be driven high after, if without other communication process
Then send second to the slave and reply response, second is sent to the slave otherwise after other communication process terminate
Reply response；
Step 3, the slave sends data after the second reply response is received to main frame；
Step 4, main frame sends second and replys and confirms after data have been received to the slave；
Step 5, the slave drags down correspondence auxiliary I/O interface modules after the second reply confirmation is received, this
Sign off.
In the present embodiment, in step one, the slave opens one simultaneously to be used to define the single communication time upper limit
Communication slot timer, the slave does not receive the second reply response or second in the single communication time upper limit
Reply and then assert that this communication is communication failure when confirming, and this is communicated using a communication failure enumerator
The number of stoppages is counted.When within 2 times, the slave sends this communication failure number of times to main frame again
Data；Otherwise, the slave forces to drag down correspondence auxiliary I/O interface modules to terminate this communication, while to logical
News failure counter is zeroed out.In the present embodiment, the single communication time upper limit is set as 1.5 times of proper communications
Duration.
Below schematically to the present invention and embodiments thereof be described, the description does not have restricted, attached
Shown in figure is also one of embodiments of the present invention, and actual structure is not limited thereto.So,
If one of ordinary skill in the art is enlightened by it, in the case of without departing from the invention objective, no
Jing creatively designs the frame mode similar to the technical scheme and embodiment, all should belong to the present invention's
Protection domain.
Claims (10)
1. assisted Selection lan interfaces system, it is included for realizing data between main frame and at least one slave
The data/address bus of transmission, and at least one slave to be respectively connected at least one pair of auxiliary of main frame
I/O interface modules.
2. system according to claim 1, it is characterised in that：Also include communication slot timer and lead to
News failure counter, communication slot timer is used to define the single communication time upper limit, main frame with it is described at least
Arbitrary call duration time between one slave then assert that this time communication is communication when exceeding the single communication time upper limit
Failure, communication failure enumerator is used for the number of times to there is communication failure in single communication and counts.
3. the communication means of the key network set up based on system described in claim 1, including by least one
The step of slave sets up key network by the system described in claim 1 and a main frame, wherein, main frame
Comprise the following steps when sending data to arbitrary slave：
(1) main frame draws high auxiliary I/O interface modules corresponding with the slave；
(2) slave is being detected after correspondence auxiliary I/O interface modules are driven high to the reply of main frame transmission first
Response；
(3) main frame sends data after the first reply response is received to the slave；
(4) slave sends first and replys and confirms after data have been received to main frame；
(5) main frame drags down correspondence auxiliary I/O interface modules, this communication after the first reply confirmation is received
Terminate.
4. the communication means of key network according to claim 3, it is characterised in that：Step (1)
In, main frame opens one simultaneously to be used to define the communication slot timer of the single communication time upper limit, and main frame is in list
The first reply response is not received in the secondary communication time upper limit or the first reply then assert that this communication is when confirming
Communication failure, and this communication failure number of times is counted using a communication failure enumerator.
5. the communication means of key network according to claim 4, it is characterised in that：This communication event
When within 2 times, main frame sends data to barrier number of times to the slave again；Otherwise, main frame is forced to drag down correspondence
I/O interface modules are aided in terminate this communication, while being zeroed out to communication failure enumerator.
6. the communication means of key network according to claim 5, it is characterised in that：When single communicates
The long upper limit is set as 1.5～3 times of proper communication durations.
7. the communication means of the monitoring network set up based on system described in claim 1, including by least one
Slave sets up the step of monitoring network by the system described in claim 1 with a main frame, wherein, it is arbitrary
Slave is comprised the following steps when sending data to main frame：
Step one, the slave draws high corresponding auxiliary I/O interface module；
Step 2, main frame detect correspondence auxiliary I/O interface modules be driven high after, if without other communication process
Then send second to the slave and reply response, second is sent to the slave otherwise after other communication process terminate
Reply response；
Step 3, the slave sends data after the second reply response is received to main frame；
Step 4, main frame sends second and replys and confirms after data have been received to the slave；
Step 5, the slave drags down correspondence auxiliary I/O interface modules after the second reply confirmation is received, this
Sign off.
8. it is according to claim 7 monitor network communication means, it is characterised in that：In step one,
The slave opens one simultaneously to be used to define the communication slot timer of the single communication time upper limit, and the slave is in list
The second reply response is not received in the secondary communication time upper limit or the second reply then assert that this communication is when confirming
Communication failure, and this communication failure number of times is counted using a communication failure enumerator.
9. it is according to claim 8 monitor network communication means, it is characterised in that：This communication event
When within 2 times, the slave sends data to barrier number of times to main frame again；Otherwise, slave pressure drags down right
I/O interface modules should be aided in terminate this communication, while being zeroed out to communication failure enumerator.
10. it is according to claim 9 monitor network communication means, it is characterised in that：Single communicates
The duration upper limit is set as 1.5～3 times of proper communication durations.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115085758A (en) * | 2022-06-10 | 2022-09-20 | 贵州电网有限责任公司 | Dual-transceiver multi-mode RS-485 communication host and working method |
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| CN104133963A (en) * | 2014-07-29 | 2014-11-05 | 中国航空无线电电子研究所 | FPGA hardware abstraction layer based on high-speed serial bus and implement method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115085758A (en) * | 2022-06-10 | 2022-09-20 | 贵州电网有限责任公司 | Dual-transceiver multi-mode RS-485 communication host and working method |
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