CN117544239A - Networking structure for one-master multi-slave optical fiber TTL communication and control method - Google Patents
Networking structure for one-master multi-slave optical fiber TTL communication and control method Download PDFInfo
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- CN117544239A CN117544239A CN202311365390.8A CN202311365390A CN117544239A CN 117544239 A CN117544239 A CN 117544239A CN 202311365390 A CN202311365390 A CN 202311365390A CN 117544239 A CN117544239 A CN 117544239A
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- 238000004891 communication Methods 0.000 title claims abstract description 111
- 239000013307 optical fiber Substances 0.000 title claims abstract description 92
- 230000006855 networking Effects 0.000 title claims abstract description 75
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000002955 isolation Methods 0.000 claims abstract description 12
- 239000000835 fiber Substances 0.000 claims description 22
- 230000000630 rising effect Effects 0.000 claims description 9
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- 238000010586 diagram Methods 0.000 description 11
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- 230000005540 biological transmission Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/27—Arrangements for networking
- H04B10/275—Ring-type networks
Abstract
The utility model provides a networking structure and a control method for one master multi-slave optical fiber TTL communication, which comprises a host and at least two slaves, wherein the communication between the host and the slaves in a single-ring optical fiber is the same optical fiber transceiver circuit; the master computer communicates with the slave computer through clock signals and data signals; the data is received between the host and the slave through the optical fiber receiver, and is sent through the optical fiber transmitter. The method improves the serial port communication of the industrial site from 200m to 2000m while maintaining the communication rate of 115200bps, and solves the problems of high cost and insufficient competitive advantage of other optical fiber serial port communication technologies on the market at present. The networking part hardware cost of the optical fiber serial port is reduced by 40%, and the electronic serial port communication networking device has the capability of cost competition with the traditional electronic serial port communication networking scheme and far super electronic serial port communication networking equipment with anti-interference and electric isolation capability.
Description
Technical Field
The present disclosure relates to the field of communications technologies, and in particular, to a networking structure and a control method for one-master multi-slave optical fiber TTL communications.
Background
At present, serial port communication used in more than 98% of the industrial control field is in an electronic technology mode, communication contact of a master machine and a slave machine is carried out in modes of RS232, RS433, RS485 and the like, and the communication in the modes has an important problem that the communication is easily interfered by strong electric signals, and protection circuits such as anti-interference, lightning protection and the like are needed to be added at the inlet of related products. In addition, about 2% of the scenes need to use optical fiber serial port networking for master-slave multi-machine communication, but at present, long-distance networking is widely used by optical fiber relay equipment, and a major technical disadvantage is that two groups of optical fiber input/output interfaces (fig. 1 and 2) are needed on a host machine and a multi-slave machine module, and the optical fiber transceiver is the highest cost of a communication device and accounts for about 80% of the total cost of the communication device.
The traditional technology has the following technical problems:
the serial port networking technology of the electronic technology has the problems of poor anti-interference capability, low electrical isolation performance and the like, and can only be suitable for occasions with poor working conditions or can improve the anti-interference capability by sacrificing the communication speed. The main networking mode at present is as follows (fig. 3).
The current optical fiber serial port networking similar technology products have two networking topologies, namely a star topology (figure 4) and a dual-interface ring topology (figure 5).
The product scheme has a major defect that the number of transceiver elements required by a communication interface is too large (which is 2 times of the number of the scheme of the invention), so that the product cost is high, and the serial port communication networking scheme facing the conventional electronic technology on the market has no price competitiveness.
In view of the above, no effective solution has been found in the prior art.
It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the present disclosure and thus may include information that does not constitute prior art known to those of ordinary skill in the art.
Disclosure of Invention
In view of the above-mentioned drawbacks and shortcomings of the prior art, the present application provides a networking structure and a control method for one-master multi-slave optical fiber TTL communication, so as to solve the problem of easy multiple interference of serial port communication networking schemes of conventional electronic technologies in the market, and the problem that the transmission distance is generally less than 200 meters; and meanwhile, compared with the product schemes of other optical fiber serial port networking schemes, the number of optical fiber transceivers used is reduced by more than half, and the cost of optical fiber networking equipment is reduced by 40%.
In order to solve the technical problems, the application provides a networking structure for master multi-slave optical fiber TTL communication, which comprises a master and at least two slaves, wherein the communication between the master and the slaves in a single-ring optical fiber is the same optical fiber transceiver circuit; the master computer communicates with the slave computer through clock signals and data signals; wherein: the host computer sends data to an optical fiber receiver of the first slave computer through an optical fiber transmitter; the first slave receives the data and sends the data to an optical fiber receiver of a second slave through an optical fiber transmitter of the first slave; the second slave receives the data and sends the data to a fiber receiver of a third slave through a fiber transmitter of the second slave; when all the slaves are linked in turn, the optical fiber transmitter of the last slave outputs the data to the optical fiber receiver of the host.
In one embodiment of the present invention, the data is received between the master and the slave through a fiber optic receiver and transmitted through a fiber optic transmitter to form a single channel ring topology.
In one embodiment of the invention, when the host transmits data to the slave, the host controls a clock, and the rising edge of the clock is valid; when the slave machine transmits data to the host machine, the slave machine controls a clock, and the clock falling edge is valid; when the slave transmits data to the slave, the slave controls the clock, and the clock rising edge is valid.
In one embodiment of the present invention, when the number of slaves is 64 and the networking communication distance between every two adjacent slaves is 2000m, the networking communication rate is 115200bps.
In one embodiment of the present invention, when the number of slaves is 2048 and the networking communication distance between every two adjacent slaves is 2048000m, the networking communication rate is 9600bps.
In one embodiment of the invention, the electrical isolation strength of the networking structure is 35kv.
The invention also provides a networking structure control method for one master multi-slave optical fiber TTL communication, which comprises the following steps:
the host computer sends data to an optical fiber receiver of the first slave computer through the optical fiber transmitter;
the first slave receives the data and judges whether address information contained in the data is matched with a local machine or not;
if the address information is matched with the host, analyzing a message according to the data, and replying the message to the host;
and if the address information is not matched with the local machine, the received data is sent to the next slave machine in cascade connection until the last slave machine in cascade connection.
In one embodiment of the present invention, if the address information does not match the local machine, the method further includes:
judging whether the address information is matched with preset address information or not;
if the address information is matched with the preset address information, executing a host group sending command, and forwarding a host message to the next cascade slave;
if the address information is not matched with the preset address information, directly forwarding the host message to the next cascade slave.
In one embodiment of the present invention, the preset address information is FFFF.
In one embodiment of the present invention, after the last slave sends the data to the optical fiber receiver interface of the host, the host confirms the data, and if the slave replies the data, the corresponding data is processed; and if the data content is consistent with the sent data, the corresponding slave is not found.
Compared with the prior art, the technical scheme of the invention has the following advantages:
according to the networking structure and the control method for one-master-multiple-slave optical fiber TTL communication, the optical fiber transmission medium is matched with a special forwarding control technology, so that the communication distance between any two nodes can reach 2000m under the standard that the optical fiber attenuation is not lower than-28 db, and meanwhile, the problem of electric interference which cannot be avoided by a serial port communication mode of the traditional electronic technology is solved. For example, because of the serial-in-serial-out connection mechanism of the present application, each slave is equivalent to an optical fiber relay, so as long as the distance between every two adjacent slave modules does not exceed 2000m, the actual communication distance can be 2000m×2048/2= 2048000m (the maximum communication distance is divided by 2 because of the ring topology, and the final optical fiber is going back to the host).
The method and the device solve the problems of high cost and insufficient competitive strength of other optical fiber serial port communication technologies in the market at present. The hardware cost of the networking part of the optical fiber serial port is reduced by 40%, the capability of cost competition with the traditional electronic serial port communication networking scheme is achieved, and the anti-interference and electrical isolation capability far exceeds that of the electronic serial port communication networking equipment; the electrical isolation strength of the traditional serial communication is generally within 3 kv; the final electrical isolation strength of the application can be 35kv. Under the condition that the networking communication distance of 64 slave modules reaches 2000m, the communication rate of 115200bps can be maintained; if the maximum 2048 slave modules are networked and the communication distance is up to the upper limit 2048000m, the 9600bps communication rate can still be realized.
Drawings
In order that the invention may be more readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings, in which:
FIG. 1 is a schematic diagram of a prior art network structure and control method for serial communication of a master and multiple slaves in the present application, which requires two sets of optical fiber I/O interfaces on both the master and multiple slaves;
FIG. 2 is a schematic diagram of two sets of optical fiber input/output interfaces on a host and a multi-slave module in the prior art in a networking structure and control method for communication of a master and multi-slave optical fiber serial ports in the present application;
FIG. 3 is a schematic diagram of a networking structure and control method of a master multi-slave optical fiber serial communication according to the prior art;
FIG. 4 is a schematic diagram of a star topology of the prior art in a networking architecture and control method for a master multi-slave fiber serial communication in the present application;
FIG. 5 is a schematic diagram of a dual-interface ring topology of the prior art in a networking architecture and control method for a master multi-slave fiber serial communication in the present application;
FIG. 6 is a schematic diagram of an optical signal transceiver hardware circuit implementation in a networking architecture and control method for master-slave optical fiber serial communication in the present application;
FIG. 7 is a flow chart of a networking architecture and control method for master-multi-slave optical fiber serial communication in the present application;
fig. 8 is a schematic diagram of a PCB screenshot of a test fiber transceiver function in a networking architecture and control method for master-multi-slave fiber serial communication in the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it should be understood that the accompanying drawings in the present application are only for the purpose of illustration and description, and are not intended to limit the protection scope of the present application. In addition, it should be understood that the schematic drawings are not drawn to scale. A flowchart, as used in this application, illustrates operations implemented according to some embodiments of the present application. It should be appreciated that the operations of the flow diagrams may be implemented out of order and that steps without logical context may be performed in reverse order or concurrently. Moreover, one or more other operations may be added to the flow diagrams and one or more operations may be removed from the flow diagrams as directed by those skilled in the art.
In addition, the described embodiments are only some, but not all, of the embodiments of the present application. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, are intended to be within the scope of the present application.
In order to enable those skilled in the art to use the present disclosure, the following embodiments are provided in connection with a specific application scenario, "a network architecture for one-master multi-slave fiber TTL communication", and it will be apparent to those skilled in the art that the general principles defined herein may be applied to other embodiments and application scenarios without departing from the spirit and scope of the present disclosure.
The method described below in the embodiment of the present application may be applied to any scenario in which control of a networking structure based on one-master-multiple-slave optical fiber TTL communication is required, and the embodiment of the present application does not limit a specific application scenario, and any scheme using control of a networking structure based on one-master-multiple-slave optical fiber TTL communication provided in the embodiment of the present application is within the scope of protection of the present application.
In order to facilitate understanding of the present application, the technical solutions provided in the present application are described in detail below in conjunction with specific embodiments.
The application provides a networking structure and a control method for one-master multi-slave optical fiber TTL communication, which are used for solving the defects of poor anti-interference performance and short communication distance of serial port communication in the traditional electronic technology, and simultaneously solving the defects of high hardware cost and complex connection layout of the common optical fiber serial port networking.
In order to solve the problem that various protection circuits are needed due to the inherent poor anti-interference capability of the communication mode of the traditional electronic technology, the device cost is reduced by about 40 percent compared with other master-slave system optical fiber communication networking modes.
In a first aspect, the present application provides a networking structure for TTL communication of a master optical fiber and multiple slaves, including a master and at least two slaves, where the communication between the master and the slaves in a single ring optical fiber is the same optical fiber transceiver circuit; the master computer communicates with the slave computer through clock signals and data signals; wherein:
the host computer sends data to an optical fiber receiver of the first slave computer through an optical fiber transmitter;
the first slave receives the data and sends the data to an optical fiber receiver of a second slave through an optical fiber transmitter of the first slave;
the second slave receives the data and sends the data to a fiber receiver of a third slave through a fiber transmitter of the second slave;
when all the slaves are linked in turn, the optical fiber transmitter of the last slave outputs the data to the optical fiber receiver of the host.
In some possible embodiments, the data is received between the master and the slave through a fiber optic receiver and sent through a fiber optic transmitter to form a single channel ring topology.
Fig. 6 is a schematic diagram of an optical signal transceiver hardware circuit implementation in a single-ring optical fiber serial networking topology. As in fig. 6, the same fiber optic transceiver circuitry is used for both the master and slave communications. Both the master and the slaves receive data via the fiber optic receiver RU1 and transmit data via the TU 1.
The specific networking connection mode is as follows: the host computer sends data to RU1 of the first slave computer through TU1, then the first slave computer sends data to RU1 of the second slave computer from TU1, then the second slave computer sends data to RU1 of the third slave computer through TU2, and the same connection mode links TU1 output signals of the last slave computer after all the slave computers to RU1 of the host computer in sequence, so that a single-channel ring topology is formed.
It should be noted that the single channel ring topology: the communication host and the slave can realize serial port optical fiber master-slave networking communication by only connecting one optical receiver and one optical transmitter to form a single-chain annular structure in an initial position; with single-channel ring topology, the software control strategy adopts the data structure of the slave machine to complete the receiving and forwarding judging mechanism of the serial data fiber data by distinguishing the data structure of the slave machine through the unique ID (address, displacement matching data and the like) or data with similar ID function by adopting the head of the host machine message, so that the data collision of multiple slave machines is avoided; the host uses the group sending broadcast instruction code to realize that the communication instruction is issued to all the slaves in the network by omitting the slave IDs (addresses, displacement matching data and the like).
In some possible implementations, the master controls the clock with a clock rising edge active when the master sends data to the slave; when the slave machine transmits data to the host machine, the slave machine controls a clock, and the clock falling edge is valid; when the slave transmits data to the slave, the slave controls the clock, and the clock rising edge is valid.
Illustratively, the communication protocol of the present application is: the communication between the host and the slave is realized by a clock signal and a data signal, when the host transmits data to the slave, the clock is controlled by the host, and the rising edge of the clock is effective; when the slave machine sends data to the host machine, the slave machine controls a clock, and the falling edge is effective; when the slave transmits data to the slave, the slave controls the clock and the rising edge is valid. The 8-bit data is transmitted at a time to form one byte until one frame of data is transmitted.
Further, after receiving a frame of data, the slave determines whether address information contained in the data is consistent with the slave, if so, the slave replies the data to the host, and at the moment, the slave controls a clock signal and the falling edge is valid. If the data are inconsistent, the received data are sent to the next slave machine in the cascade, the clock signal is controlled by the slave machine, the rising edge is valid, and the like until the last slave machine in the cascade.
In some possible embodiments, when the number of slaves is 64 and the networking communication distance between every two adjacent slaves is 2000m, the networking communication rate is 115200bps.
In some possible embodiments, when the number of slaves is 2048 and the networking communication distance between every two adjacent slaves is 2048000m, the networking communication rate is 9600bps.
For example, because the serial-in-serial-out connection mechanism of the present application, each slave is equivalent to an optical fiber relay, as long as the distance between every two adjacent slave modules does not exceed 2000m, the actual communication distance can be 2000m×2048/2= 2048000m (the maximum communication distance is divided by 2 because of the ring topology, and the final optical fiber is going back to the host).
Specifically, under the condition that the networking communication distance of 64 slave modules reaches 2000m, the communication rate of 115200bps can be maintained; if the maximum 2048 slave modules are networked and the communication distance is up to the upper limit 2048000m, the 9600bps communication rate can still be realized.
In some possible embodiments, the electrical isolation strength of the networking structure is 35kv.
By way of example, conventional serial communications typically have an electrical isolation strength typically within 3 kv; the final electrical isolation strength of the application can be 35kv.
In summary, the present application proposes a networking structure for one master multi-slave optical fiber TTL communication, and by using an optical fiber transmission medium and a specific forwarding control technology, the communication distance between any two nodes can reach 2000m under the standard that the optical fiber attenuation is not lower than-28 db, and meanwhile, the problem of electrical interference unavoidable in the serial port communication mode of the traditional electronic technology is solved. Further solves the problems of high cost and insufficient competitive strength of other optical fiber serial port communication technologies in the market at present. The networking part hardware cost of the optical fiber serial port is reduced by 40%, the capability of cost competition with the traditional electronic serial port communication networking scheme is achieved, and the anti-interference and electrical isolation capability far exceeds the electronic serial port communication networking equipment.
Based on the same application conception, the embodiment of the application also provides a networking structure control method corresponding to the one-master multi-slave optical fiber TTL communication with the networking structure provided by the embodiment, and because the principle of solving the problem in the method in the embodiment of the application is similar to the structure of the embodiment of the application, the implementation of the method can refer to the implementation of the structure, and the repetition is omitted.
In a second aspect, the present application further provides a method for controlling a network structure for performing TTL communication by using a master multi-slave optical fiber, where the method includes:
the host computer sends data to an optical fiber receiver of the first slave computer through the optical fiber transmitter;
the first slave receives the data and judges whether address information contained in the data is matched with a local machine or not;
if the address information is matched with the host, analyzing a message according to the data, and replying the message to the host;
and if the address information is not matched with the local machine, the received data is sent to the next slave machine in cascade connection until the last slave machine in cascade connection.
In some possible embodiments, after the last slave sends the data to the optical fiber receiver interface of the host, the host confirms the data, and if the slave replies the data, the corresponding data is processed; and if the data content is consistent with the sent data, the corresponding slave is not found.
Exemplary, referring to fig. 7, a method flow chart of specific implementation steps of a network architecture control method for a master multi-slave optical fiber TTL communication is shown. The communication message sent by the host starts with the unique ID of the slave machine of the communication object, then the communication message is the data content such as communication instruction, data, verification and the like, the first slave machine confirms whether the ID of the message start is the same as the self ID after receiving the data on the optical fiber transmitter of the host machine TU1, if so, the corresponding reply message made by the data after analyzing the data according to the data content is sent to the second slave machine through the self TU1, and the reply message also takes the self ID as the start data; if the ID data received by the slave is inconsistent with the self ID, the received data is directly forwarded from the TU1 port of the slave to the next slave without data analysis. After the last slave sends the data to the receiving port of the host RU1, the host confirms the data content, and if the slave replies the data, the corresponding data is processed; if the data content is identical to the content sent by the user, the corresponding slave is not found.
In some possible embodiments, if the address information does not match the local machine, the method further includes:
judging whether the address information is matched with preset address information or not;
if the address information is matched with the preset address information, executing a host group sending command, and forwarding a host message to the next cascade slave;
if the address information is not matched with the preset address information, directly forwarding the host message to the next cascade slave.
In some possible embodiments, the preset address information is FFFF.
For example, as shown in table 1 below, some communication message examples include a special group sending instruction for sending data by the host, where the ID of the data header is not the address of a certain slave, but is ID data agreed in advance, for example, when the application is tested, a preset FFFF is used as a group sending ID, after the slave receives the data, if the ID is found to be FFFF, the slave executes the corresponding group sending instruction by itself, and forwards the instruction to the next slave through the TU1 port as it is.
TABLE 1
In summary, the networking structure and the control method for one-master multi-slave optical fiber TTL communication provided by the application solve the problem of electric interference unavoidable in the serial port communication mode of the traditional electronic technology, and can improve the serial port communication of the industrial field from 200m to 2000 m; secondly, the problems of high cost and insufficient competitive strength of other optical fiber serial port communication technologies in the market at present are solved. The hardware cost of the networking part of the optical fiber serial port is reduced by 40%, the capability of cost competition with the traditional electronic serial port communication networking scheme is achieved, and the anti-interference and electrical isolation capability far exceeds that of the electronic serial port communication networking equipment; finally, a communication rate of 115200bps can be maintained in the case where the networking communication distance reaches 2000 m.
It should be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or architecture. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations and modifications of the present invention will be apparent to those of ordinary skill in the art in light of the foregoing description. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present invention.
Claims (10)
1. A network structure of one master and multiple slave optical fiber TTL communication is characterized by comprising a master and at least two slaves, wherein the communication between the master and the slaves in a single-ring optical fiber is the same optical fiber transceiver circuit; the master computer communicates with the slave computer through clock signals and data signals; wherein:
the host computer sends data to an optical fiber receiver of the first slave computer through an optical fiber transmitter;
the first slave receives the data and sends the data to an optical fiber receiver of a second slave through an optical fiber transmitter of the first slave;
the second slave receives the data and sends the data to a fiber receiver of a third slave through a fiber transmitter of the second slave;
when all the slaves are linked in turn, the optical fiber transmitter of the last slave outputs the data to the optical fiber receiver of the host.
2. The networking architecture of claim 1, wherein the host and the slave receive data via fiber optic receivers and transmit data via fiber optic transmitters to form a single channel ring topology.
3. The networking architecture for a master multi-slave fiber TTL communication of claim 1, wherein:
when the host transmits data to the slave, the host controls a clock, and the rising edge of the clock is valid;
when the slave machine transmits data to the host machine, the slave machine controls a clock, and the clock falling edge is valid;
when the slave transmits data to the slave, the slave controls the clock, and the clock rising edge is valid.
4. The networking architecture for a master multi-slave optical fiber TTL communication of claim 1, wherein when there are 64 slaves and the networking communication distance between every two adjacent slaves is 2000m, the networking communication rate is 115200bps.
5. The networking architecture for a master multi-slave optical fiber TTL communication of claim 1, wherein when there are 2048 slaves and the networking communication distance between every two adjacent slaves is 2048000m, the networking communication rate is 9600bps.
6. The networking architecture of claim 1, wherein the networking architecture has an electrical isolation strength of 35kv.
7. A networking structure control method for one master multi-slave optical fiber TTL communication is characterized by comprising the following steps:
the host computer sends data to an optical fiber receiver of the first slave computer through the optical fiber transmitter;
the first slave receives the data and judges whether address information contained in the data is matched with a local machine or not;
if the address information is matched with the host, analyzing a message according to the data, and replying the message to the host;
and if the address information is not matched with the local machine, the received data is sent to the next slave machine in cascade connection until the last slave machine in cascade connection.
8. The method of claim 7, further comprising, if the address information does not match the local server:
judging whether the address information is matched with preset address information or not;
if the address information is matched with the preset address information, executing a host group sending command, and forwarding a host message to the next cascade slave;
if the address information is not matched with the preset address information, directly forwarding the host message to the next cascade slave.
9. The method of claim 8, wherein the predetermined address information is FFFF.
10. The method of claim 7, wherein after the last slave sends the data to the fiber receiver interface of the host, the host confirms the data, and if the slave replies the data, the corresponding data is processed; and if the data content is consistent with the sent data, the corresponding slave is not found.
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| CN202311365390.8A CN117544239A (en) | 2023-10-20 | 2023-10-20 | Networking structure for one-master multi-slave optical fiber TTL communication and control method |
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