CN111030906A - Method for automatically addressing slave station address based on RS485 bus cascade - Google Patents
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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
- H04L12/40052—High-speed IEEE 1394 serial bus
- H04L12/40078—Bus configuration
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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
- H04L1/0078—Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location
- H04L1/0083—Formatting with frames or packets; Protocol or part of protocol for error control
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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
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/1607—Details of the supervisory signal
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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
- H04L12/40052—High-speed IEEE 1394 serial bus
- H04L12/40071—Packet processing; Packet format
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L61/00—Network arrangements, protocols or services for addressing or naming
- H04L61/50—Address allocation
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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
- H04L2012/40208—Bus networks characterized by the use of a particular bus standard
- H04L2012/40221—Profibus
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Abstract
The invention discloses a slave station address automatic addressing method based on RS485 bus cascade connection, which comprises a first step, a second step, a third step, a fourth step, a fifth step and a sixth step. The invention belongs to the technical field of communication of low-voltage direct-current distribution equipment, and particularly provides an automatic slave station address addressing method based on RS485 bus cascade, which can flexibly adjust the position of equipment, simplify the address addressing process of a communication address during field construction, reduce the addressing workload, avoid the problem caused by addressing errors and improve the construction efficiency and the system reliability.
Description
Technical Field
The invention belongs to the technical field of low-voltage direct-current distribution equipment communication, and particularly relates to a slave station address automatic addressing method based on RS485 bus cascade.
Background
In the middle and later periods of the 20 th century, along with the development and application of power electronic power devices, power loads are diversified, meanwhile, the requirements of computers and communication equipment on the safety and stability of a power supply are continuously improved, and the development of a direct-current power distribution technology is greatly promoted. By the end of the 20 th century, low-voltage direct-current power distribution has been successfully applied to the fields of data communication centers, aviation, ships, urban rail transit and the like, which have high requirements on power supply quality. After 2000 years, the problems of energy crisis, environmental pollution and the like are obvious, and renewable energy and energy conservation and environmental protection are generally concerned by countries in the world. Most renewable energy sources are direct-current power supplies, and most energy-saving equipment is direct-current loads. The increase of direct current power sources and loads has promoted the research and application of low-voltage direct current power distribution networks.
UPS has solved the power consumption reliability under the power grid outage condition in the industrial production field, but has also appeared a lot of problems, and the dc-to-ac converter link can bring the loss of about 5% of mains power, is a node that breaks down most easily moreover, and the proportion that its cost accounts for is very big. The output of the UPS is an alternating current signal, the influence of a plurality of parameters needs to be considered for capacity expansion, and the requirement on a capacity expansion parallel technology is high.
With the development of energy utilization technology, the direct-current remote power supply technology has technical and economic advantages, and has good development prospect under the background of modern power system revolution. On the low-voltage level side, direct-current power distribution provides an optimized solution for improving the power transmission efficiency, the power quality and the system reliability for the application requirement of remote power supply. At present, the advantages of direct current power distribution are already embodied in some independent power supply systems, such as communication base stations, data centers, aerospace and ocean power supply systems, and for these independent power supply systems, power supply reliability, power transmission efficiency and construction cost are particularly important.
The distributed remote power supply system is composed of a plurality of power supply nodes and communication among power supplies is required to be realized. Industrial communication buses various industrial field buses have been designed in order to achieve real-time and reliability. Generally, an RS485 bus or a CAN bus is used for multiple purposes. The RS485 bus is a differential serial communication bus, has low cost, mature technology and easy realization, and is widely applied to various industrial occasions. Each module in the RS485 bus network needs to configure an address, otherwise, a conflict occurs or data cannot be processed, but in engineering implementation, a problem of address setting errors often occurs, and a more convenient method for automatically allocating addresses needs to be found.
Disclosure of Invention
In order to solve the existing problems, the invention provides the automatic slave station address addressing method based on the RS485 bus cascade, which can flexibly adjust the position of equipment, simplify the communication address addressing process in field construction, reduce the addressing workload, avoid the problems caused by the addressing error and improve the construction efficiency and the system reliability.
The technical scheme adopted by the invention is as follows: the invention discloses an RS485 bus-based cascade system which comprises a direct current power grid and an RS485 bus, wherein a plurality of power supply modules are arranged in the direct current power grid and are in cascade connection through the RS485 bus, each power supply module comprises a master station and a slave station, and the power supply modules are all set as the slave stations when the power supply modules are out of the field.
The invention relates to a slave station address automatic addressing method based on RS485 bus cascade, which comprises the following steps:
the method comprises the following steps: setting the most main power supply module as a master station, setting the address of the master station as a zeroth address, and setting the rest power supply modules as slave stations, wherein the slave stations comprise a first slave station, a second slave station, a third slave station, a fourth slave station and a terminal slave station which are sequentially cascaded through an RS485 bus, the first slave station is cascaded with the master station through the RS485 bus, the master station sends a configuration frame to the slave stations, and the slave stations send configuration response frames to the master station after receiving the configuration frame sent by the master station;
step two: the master station broadcasts and sends a first configuration frame to the slave stations after the system is started, the first slave station receives the first configuration frame sent by the master station, the first slave station sets the address of the first slave station as a first address after receiving the first configuration frame, sets the address of the next cascade master station as the first address and sends a configuration response frame to the master station, and the master station receives address configuration information of the slave stations and marks address configuration of the first slave station;
step three: the master station sends a second configuration frame, the first slave station receives the second configuration frame and then continuously sends the second configuration frame to a second slave station through a cascade master station of the first slave station, the second slave station receives the second configuration frame and then sets the address of the second slave station as a second address, sets the address of the next cascade master station as the second address, continuously transmits a configuration response frame to the master station through the first slave station, and the master station receives address configuration information of the slave station and marks address configuration of the second slave station;
step four: the master station sends a third configuration frame, the third configuration frame is continuously sent to a third slave station through the first slave station and the second slave station, the third slave station receives the third configuration frame, the third slave station sets the address of the third slave station as a third address after receiving the third configuration frame, sets the address of the next cascade master station as the third address, continuously transmits a configuration response frame to the master station through the first slave station and the second slave station, and receives the address configuration information of the slave station and marks the address configuration of the third slave station;
step five: the master station sends a fourth configuration frame, the fourth configuration frame is continuously sent to a fourth slave station through the first slave station, the second slave station and the third slave station, the fourth slave station receives the fourth configuration frame, the fourth slave station sets the address of the fourth slave station as a fourth address after receiving the fourth configuration frame, the fourth slave station continuously transmits a configuration response frame to the master station through the first slave station, the second slave station and the third slave station, and the master station receives address configuration information of the slave station and marks address configuration of the fourth slave station;
step six: and the master station sequentially sends the configuration frames according to the process until the last-stage slave station has no next-stage slave station, the last-stage slave station is set as a terminal slave station, and the terminal slave station replies the configuration response frame of the master station terminal slave station and confirms the slave station equipment of the whole direct current power grid, and then normal communication between the master station and the slave station is started.
Further, the zeroth address is subjected to 1 adding operation to obtain a first address, the first address is subjected to 1 adding operation to obtain a second address, the second address is subjected to 1 adding operation to obtain a third address, and the third address is subjected to 1 adding operation to obtain a fourth address.
Further, the format of the configuration frame is a configuration instruction located in a first byte, a master station address located in a second byte, a slave station address located in a third byte, and a continuous transmission slave station address located in a fourth byte.
Further, the format of the configuration response frame is a configuration response command located in the first byte, a master station address located in the second byte, a response slave station address located in the third byte, and a continuous transfer slave station address located in the fourth byte.
The beneficial effects obtained by adopting the scheme are as follows: the invention relates to a slave station address automatic addressing method based on RS485 bus cascade, which realizes the communication between a master station and a slave station of an RS485 bus in a cascade mode, automatically configures the address of each slave station through the sequential confirmation of the master station and each slave station, simplifies the communication address addressing process during field construction, reduces the addressing workload and avoids the problem caused by the addressing error.
Drawings
Fig. 1 is a schematic diagram of a configuration frame format of a slave station address automatic addressing method based on RS485 bus cascade connection according to the present invention;
fig. 2 is a schematic diagram of a configuration response frame format of the slave station address automatic addressing method based on RS485 bus cascade connection.
The system comprises a configuration instruction A, a configuration instruction B, a master station address C, a slave station address D, a continuous transmission slave station address a, a first byte, a second byte, a third byte, a fourth byte, a configuration response instruction I, a master station address II, a response slave station address III, a response slave station address IV and a continuous transmission slave station address.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1-2, the RS485 bus based cascade system of the present invention includes a dc power grid and an RS485 bus, wherein a plurality of power modules are provided in the dc power grid, the power modules are cascade-connected via the RS485 bus, each power module includes a master station and a slave station, and all the power modules are set as slave stations when they are out of the field.
The specific embodiment is as follows:
the invention relates to a slave station address automatic addressing method based on RS485 bus cascade, which comprises the following steps:
the method comprises the following steps: setting the most main power supply module as a master station, setting the address of the master station as a zeroth address, and setting the rest power supply modules as slave stations, wherein the slave stations comprise a first slave station, a second slave station, a third slave station, a fourth slave station and a terminal slave station which are sequentially cascaded through an RS485 bus, the first slave station is cascaded with the master station through the RS485 bus, the master station sends a configuration frame to the slave stations, and the slave stations send configuration response frames to the master station after receiving the configuration frame sent by the master station;
step two: the master station broadcasts and sends a first configuration frame to the slave stations after the system is started, the first slave station receives the first configuration frame sent by the master station, the first slave station sets the address of the first slave station as a first address after receiving the first configuration frame, sets the address of the next cascade master station as the first address and sends a configuration response frame to the master station, and the master station receives address configuration information of the slave stations and marks address configuration of the first slave station;
step three: the master station sends a second configuration frame, the first slave station receives the second configuration frame and then continuously sends the second configuration frame to a second slave station through a cascade master station of the first slave station, the second slave station receives the second configuration frame and then sets the address of the second slave station as a second address, sets the address of the next cascade master station as the second address, continuously transmits a configuration response frame to the master station through the first slave station, and the master station receives address configuration information of the slave station and marks address configuration of the second slave station;
step four: the master station sends a third configuration frame, the third configuration frame is continuously sent to a third slave station through the first slave station and the second slave station, the third slave station receives the third configuration frame, the third slave station sets the address of the third slave station as a third address after receiving the third configuration frame, sets the address of the next cascade master station as the third address, continuously transmits a configuration response frame to the master station through the first slave station and the second slave station, and receives the address configuration information of the slave station and marks the address configuration of the third slave station;
step five: the master station sends a fourth configuration frame, the fourth configuration frame is continuously sent to a fourth slave station through the first slave station, the second slave station and the third slave station, the fourth slave station receives the fourth configuration frame, the fourth slave station sets the address of the fourth slave station as a fourth address after receiving the fourth configuration frame, the fourth slave station continuously transmits a configuration response frame to the master station through the first slave station, the second slave station and the third slave station, and the master station receives address configuration information of the slave station and marks address configuration of the fourth slave station;
step six: and the master station sequentially sends the configuration frames according to the process until the last-stage slave station has no next-stage slave station, the last-stage slave station is set as a terminal slave station, and the terminal slave station replies the configuration response frame of the master station terminal slave station and confirms the slave station equipment of the whole direct current power grid, and then normal communication between the master station and the slave station is started.
The configuration frame is in the format of a configuration instruction located in a first byte, a master station address located in a second byte, a slave station address located in a third byte and a continuous transmission slave station address located in a fourth byte, and the configuration response frame is in the format of a configuration response instruction located in the first byte, a master station address located in the second byte, a response slave station address located in the third byte and a continuous transmission slave station address located in the fourth byte.
When the system is initialized, the master station sends a configuration frame to the slave stations, the first byte of the configuration frame is a configuration instruction, after each slave station receives the configuration frame, the address of the slave station for continuously transmitting the configuration frame is added with 1 and set as the address of the slave station, the address byte of the slave station for continuously transmitting is filled with the address obtained by adding 1 to the slave station address, the configuration frame is sent to the next slave station, and after the address of the current slave station for continuously transmitting is set, the address is consistent with the address of the slave station n, namely the address of the target slave station, the continuous transmission is finished, and a configuration response frame is sent.
And after the target response slave station completes configuration, sending a configuration response frame to the master station, wherein a first byte of the configuration response frame is a configuration response instruction, after each slave station receives the configuration response frame, performing minus 1 operation on the address of the continuous transmission slave station, matching the address with the address of the current slave station, filling the address byte of the continuous transmission slave station into the address of the slave station, sending the configuration response frame to the previous-stage slave station until the address of the continuous transmission slave station is a zeroth address, sending the configuration response frame to the master station, namely completing address configuration of the current target slave station, and starting address configuration of the next target slave station.
The present invention and the embodiments thereof have been described above, and the description is not restrictive, but only one of the embodiments of the present invention, and the practical solution is not limited thereto. In summary, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (4)
1. The utility model provides a based on RS485 bus cascade system which characterized in that: the intelligent power supply system comprises a direct current power grid and an RS485 bus, wherein a plurality of power supply modules are arranged in the direct current power grid and are connected in a cascade mode through the RS485 bus, each power supply module comprises a master station and a slave station, and the power supply modules are all set as the slave stations when the power supply modules are out of the field.
2. A slave station address automatic addressing method based on RS485 bus cascade is characterized by comprising the following steps:
(1) setting the most main power supply module as a master station, setting the address of the master station as a zeroth address, and setting the rest power supply modules as slave stations, wherein the slave stations comprise a first slave station, a second slave station, a third slave station, a fourth slave station and a terminal slave station which are sequentially cascaded through an RS485 bus, the first slave station is cascaded with the master station through the RS485 bus, the master station sends a configuration frame to the slave stations, and the slave stations send configuration response frames to the master station after receiving the configuration frame sent by the master station;
(2) the master station broadcasts and sends a first configuration frame to the slave stations after the system is started, the first slave station receives the first configuration frame sent by the master station, the first slave station sets the address of the first slave station as a first address after receiving the first configuration frame, sets the address of the next cascade master station as the first address and sends a configuration response frame to the master station, and the master station receives address configuration information of the slave stations and marks address configuration of the first slave station;
(3) the master station sends a second configuration frame, the first slave station receives the second configuration frame and then continuously sends the second configuration frame to a second slave station through a cascade master station of the first slave station, the second slave station receives the second configuration frame and then sets the address of the second slave station as a second address, sets the address of the next cascade master station as the second address, continuously transmits a configuration response frame to the master station through the first slave station, and the master station receives address configuration information of the slave station and marks address configuration of the second slave station;
(4) the master station sends a third configuration frame, the third configuration frame is continuously sent to a third slave station through the first slave station and the second slave station, the third slave station receives the third configuration frame, the third slave station sets the address of the third slave station as a third address after receiving the third configuration frame, sets the address of the next cascade master station as the third address, continuously transmits a configuration response frame to the master station through the first slave station and the second slave station, and receives the address configuration information of the slave station and marks the address configuration of the third slave station;
(5) the master station sends a fourth configuration frame, the fourth configuration frame is continuously sent to a fourth slave station through the first slave station, the second slave station and the third slave station, the fourth slave station receives the fourth configuration frame, the fourth slave station sets the address of the fourth slave station as a fourth address after receiving the fourth configuration frame, the fourth slave station continuously transmits a configuration response frame to the master station through the first slave station, the second slave station and the third slave station, and the master station receives address configuration information of the slave station and marks address configuration of the fourth slave station;
(6) and the master station sequentially sends the configuration frames according to the process until the last-stage slave station has no next-stage slave station, the last-stage slave station is set as a terminal slave station, and the terminal slave station replies the configuration response frame of the master station terminal slave station and confirms the slave station equipment of the whole direct current power grid, and then normal communication between the master station and the slave station is started.
3. The method for automatically addressing slave station addresses based on RS485 bus cascade as claimed in claim 2, wherein: the configuration frame is in the format of a configuration instruction located in a first byte, a master station address located in a second byte, a slave station address located in a third byte and a continuous transmission slave station address located in a fourth byte.
4. The method for automatically addressing slave station addresses based on RS485 bus cascade as claimed in claim 2, wherein: the configuration response frame is in the format of a configuration response instruction located in a first byte, a master station address located in a second byte, a response slave station address located in a third byte and a continuous transmission slave station address located in a fourth byte.
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| CN111756609A (en) * | 2020-06-15 | 2020-10-09 | 苏州汇川技术有限公司 | Station number automatic allocation method, master station equipment, slave station equipment and single-spindle detection system |
| CN112929251A (en) * | 2021-02-07 | 2021-06-08 | 深圳市显控科技股份有限公司 | CAN-based slave station data refreshing method, device and system |
| CN113271244A (en) * | 2021-04-09 | 2021-08-17 | 电子科技大学 | RS485 bus ad hoc network full-duplex communication system and automatic address addressing method thereof |
| CN115051886A (en) * | 2022-04-23 | 2022-09-13 | 科博达技术股份有限公司 | Automatic addressing method for slave controller based on external load time sequence |
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| CN115051886B (en) * | 2022-04-23 | 2023-07-18 | 科博达技术股份有限公司 | Automatic addressing method of slave controller based on external load time sequence |
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Application publication date: 20200417 |