CN111262765A - Communication system and method based on redundant BLVDS bus - Google Patents
Communication system and method based on redundant BLVDS bus Download PDFInfo
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- CN111262765A CN111262765A CN202010044670.9A CN202010044670A CN111262765A CN 111262765 A CN111262765 A CN 111262765A CN 202010044670 A CN202010044670 A CN 202010044670A CN 111262765 A CN111262765 A CN 111262765A
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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
- H04L12/40169—Flexible bus arrangements
- H04L12/40176—Flexible bus arrangements involving redundancy
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/40006—Architecture of a communication node
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L61/00—Network arrangements, protocols or services for addressing or naming
- H04L61/50—Address allocation
Abstract
The invention provides a communication system and a method based on a redundant BLVDS bus. The system comprises a master station device and a plurality of slave station devices, wherein the master station device and the plurality of slave station devices are connected together through a default BLVDS bus and a redundant BLVDS bus to form a bus topology; the master station equipment comprises a first checking unit, an address allocation unit and a first bus data receiving and transmitting unit; each slave station device comprises a second checking unit, an address receiving unit and a second bus data transceiving unit; after the power is on, the master station equipment allocates a dynamic address to each slave station equipment through the address allocation unit; the first bus data receiving and transmitting unit and the second bus data receiving and transmitting unit are used for realizing data interaction between the master station device and the slave station device; the default BLVDS bus and the redundant BLVDS bus are connected through the default BLVDS bus and the redundant BLVDS bus, and data on the default BLVDS bus and the redundant BLVDS bus are received and transmitted.
Description
Technical Field
The invention relates to the technical field of data communication, in particular to a communication system and a method based on a redundant BLVDS bus.
Background
The blvds (bus Low Voltage differential signaling) bus type Low Voltage differential signal is a bus interface circuit based on LVDS (Low Voltage differential signaling) technology, and has a Low Voltage differential signal of about 250mV and a fast transition time, which solves the defect of double transmission of communication data in the bus technology by LVDS, inherits the advantages of fast transmission speed in an LVDS bus, and the like, and is specially used for realizing the application of multi-point cable or backplane signal communication. In some medium and large system devices, the BLVDS bus has a fast data exchange rate, and is inevitably affected by other factors (e.g., physical damage, electrical interference, etc.), resulting in stability and reliability of data exchange between the master device and the slave device. For example: chinese patent CN108768814A describes a data communication method based on BLVDS bus, which implements a data transmission mechanism of a single-channel bus, and considers that the command transmission fails if no correct reply is received all the time after the main control device completes the command transmission, so that the main control device can cause a longer time of system stagnation after completing the command transmission, which affects the normal data exchange of other slave devices, thereby reducing the rate of bus data exchange.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a communication system and a method based on a redundant BLVDS bus, which increase a redundancy mechanism and a check mechanism of the BLVDS bus on the basis of reducing the design complexity and realize the stability and reliability of data interaction.
The technical scheme of the invention is as follows:
a communication system based on a redundant BLVDS bus comprises a master station device and a plurality of slave station devices, wherein the master station device and the plurality of slave station devices are connected together through a default BLVDS bus and the redundant BLVDS bus to form a bus topology;
the master station equipment comprises a first checking unit, an address allocation unit and a first bus data receiving and transmitting unit;
each slave station device comprises a second checking unit, an address receiving unit and a second bus data transceiving unit;
after the power is on, the master station equipment allocates a dynamic address to each slave station equipment through the address allocation unit;
the slave station equipment receives the dynamic address allocated by the master station equipment through the address receiving unit;
the address distribution unit is connected with the address receiving unit through an address distribution line;
the first bus data receiving and transmitting unit and the second bus data receiving and transmitting unit are used for realizing data interaction between the master station device and the slave station device; the default BLVDS bus and the redundant BLVDS bus are connected, and data on the default BLVDS bus and the redundant BLVDS bus are received and sent;
the first checking unit is connected with the first bus data receiving and sending unit and used for verifying whether the data command received by the first bus data receiving and sending unit is valid data or not;
and the second checking unit is connected with the second bus data transceiving unit and used for checking whether the data command received from the second bus data transceiving unit is valid data or not.
Optionally, the first bus data transceiver unit may send data to the second bus data transceiver unit of each slave device through the default BLVDS bus and the redundant BLVDS bus in sequence.
Optionally, the first bus data transceiver unit of the master station device sends data to the default BLVDS bus first, and sends the same data to the redundant BLVDS bus after a certain time interval;
the second bus data transceiver unit of the slave station device firstly receives the data of the default BLVDS bus, and sends the received data to the second checking unit, and the second checking unit checks the data;
if the received data is valid data, the slave station equipment executes command data sent by the master station equipment and replies a data command to the master station equipment, and meanwhile, receives data on the redundant BLVDS bus but does not process the data on the redundant BLVDS bus;
if the received data is invalid data, the second bus data transceiver unit receives the data of the redundant BLVDS bus and sends the data to the second checking unit; the second checking unit checks the data received by the second bus data receiving unit on the redundant BLVDS bus in the same checking mode as the default BLVDS bus;
if the data on the redundant BLVDS bus is valid data, the slave station equipment executes command data sent by the master station equipment and replies a data command to the master station equipment;
if the data on the redundant BLVDS bus is invalid data, the received data is not processed, the number of times of receiving errors is recorded, and the master station equipment is waited to send again;
if 3 consecutive occurrences: and if the data sent by the default BLVDS bus and the redundant BLVDS bus are invalid data, the first bus data transceiving unit stops sending the data and closes the buses.
Optionally, when the slave device replies a data command to the master device, the second bus data transceiver unit may transmit data to the first bus data transceiver unit of the master device through the default BLVDS bus and the redundant BLVDS bus in sequence; wherein:
the first bus data transceiver unit of the master station device firstly receives data of a default BLVDS bus, and sends the received data to the first checking unit, and the first checking unit can check the data in the same checking mode as the second checking unit;
if the received data is valid data, the master station equipment executes a data command sent by the slave station equipment and replies command data to the slave station equipment, and meanwhile, receives data on the redundant BLVDS bus but does not process the data on the redundant BLVDS bus;
if the received data is invalid data, the first bus data receiving and transmitting unit receives the data of the redundant BLVDS bus and transmits the data to the first checking unit; the first checking unit checks the data on the redundant BLVDS bus received by the first bus data receiving unit in the same checking mode as the default BLVDS bus;
if the data on the redundant BLVDS bus is valid data, the master station equipment executes the data command sent by the slave station equipment and replies command data to the slave station equipment;
if the data on the redundant BLVDS bus is invalid data, the received data is not processed, the number of times of receiving errors is recorded, and the slave station equipment is waited to send again;
if 3 consecutive occurrences: and if the data sent by the default BLVDS bus and the redundant BLVDS bus are invalid data, the second bus data transceiver unit stops sending the data and closes the buses.
A communication method based on a redundant BLVDS bus, comprising the steps of:
s1: establishing a redundant BLVDS bus based communication system of any of claims 1 to 5;
s2: the first bus data transceiver unit of the main station equipment firstly sends data to the default BLVDS bus, and then sends the same data to the redundant BLVDS bus after a certain time interval;
s3: the second bus data transceiver unit of the slave station equipment firstly receives data of a default BLVDS bus, and sends the received data to the second checking unit, and the second checking unit checks the data;
if the received data is valid data, the slave station equipment executes command data sent by the master station equipment, and receives data on the redundant BLVDS bus but does not process the data on the redundant BLVDS bus; proceeding to step S5;
if the received data is invalid data, go to step S4;
s4: the second bus data transceiver unit receives the data of the redundant BLVDS bus and sends the data to the second checking unit; the second checking unit checks the data received by the second bus data receiving unit on the redundant BLVDS bus in the same checking mode as the default BLVDS bus;
if the data on the redundant BLVDS bus is valid data, the slave station equipment executes command data sent by the master station equipment; proceeding to step S5;
if the data on the redundant BLVDS bus is invalid data, the received data is not processed, the number of times of receiving errors is recorded, and the master station equipment is waited to send again; repeating steps S1 to S4;
s5: the slave station equipment replies a data command to the master station equipment, and the data command is transmitted back to the first bus data receiving and transmitting unit of the master station equipment and is processed in the master station equipment; proceeding to step S6;
s6: the system completes one data interaction.
Alternatively, in step S4, if there are 3 consecutive occurrences: and if the data sent by the default BLVDS bus and the redundant BLVDS bus are invalid data, the first bus data transceiving unit stops sending the data and closes the buses.
Optionally, in step S5, when the slave device replies to the master device with a data command, the second bus data transceiver unit may transmit data to the first bus data transceiver unit of the master device via the default BLVDS bus and the redundant BLVDS bus in sequence.
Optionally, the first bus data transceiver unit of the master device first receives data of the default BLVDS bus, and sends the received data to the first verification unit, and the first verification unit verifies the data in the same verification manner as the second verification unit;
if the received data is valid data, the master station equipment executes a data command sent by the slave station equipment and replies command data to the slave station equipment, and meanwhile, receives data on the redundant BLVDS bus but does not process the data on the redundant BLVDS bus;
if the received data is invalid data, the first bus data receiving and transmitting unit receives the data of the redundant BLVDS bus and transmits the data to the first checking unit; the first checking unit checks the data on the redundant BLVDS bus received by the first bus data receiving unit in the same checking mode as the default BLVDS bus;
if the data on the redundant BLVDS bus is valid data, the master station equipment executes the data command sent by the slave station equipment and replies command data to the slave station equipment;
if the data on the redundant BLVDS bus is invalid data, the received data is not processed, the number of times of receiving errors is recorded, and the slave station equipment is waited to send again;
if 3 consecutive occurrences: and if the data sent by the default BLVDS bus and the redundant BLVDS bus are invalid data, the second bus data transceiver unit stops sending the data and closes the buses.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention adds a redundancy mechanism, and realizes the high efficiency and stability of the whole system;
2. the invention adds a checking mechanism to realize the reliability of data interaction;
3. the invention realizes the communication system without increasing the design complexity, so that the system scheme is simple and effective, the implementation cost is reduced, and the requirements of high efficiency and reliability of communication data are met.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
fig. 1 is a schematic structural diagram of a communication system based on a redundant BLVDS bus according to an embodiment of the present invention;
fig. 2 is a flowchart of a communication method based on a redundant BLVDS bus according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
Referring to fig. 1, this embodiment discloses a communication system based on a redundant BLVDS bus, which includes a master device and a plurality of slave devices, and fig. 1 shows a slave device 1, a slave device 2, and a slave device n, n is a positive integer.
The master station device and the plurality of slave station devices are connected together through a default BLVDS bus and a redundant BLVDS bus to form a bus topology structure;
the master station equipment comprises a first checking unit, an address allocation unit and a first bus data receiving and transmitting unit;
each slave station device comprises a second checking unit, an address receiving unit and a second bus data transceiving unit;
after the power is on, the master station equipment allocates a dynamic address to each slave station equipment through the address allocation unit;
the slave station equipment receives the dynamic address allocated by the master station equipment through the address receiving unit;
the address distribution unit is connected with the address receiving unit through an address distribution line;
the first bus data receiving and transmitting unit and the second bus data receiving and transmitting unit are used for realizing data interaction between the master station device and the slave station device; the default BLVDS bus and the redundant BLVDS bus are connected, and data on the default BLVDS bus and the redundant BLVDS bus are received and sent;
the first checking unit is connected with the first bus data receiving and sending unit and used for verifying whether the data command received by the first bus data receiving and sending unit is valid data or not;
and the second checking unit is connected with the second bus data transceiving unit and used for checking whether the data command received from the second bus data transceiving unit is valid data or not.
And the first bus data transceiving unit sends data to the second bus data transceiving unit of each slave station device through the default BLVDS bus and the redundant BLVDS bus in sequence.
The first bus data transceiver unit of the master station equipment sends data to the default BLVDS bus first, and sends the same data to the redundant BLVDS bus after a certain time interval;
the second bus data transceiver unit of the slave station device firstly receives the data of the default BLVDS bus, and sends the received data to the second checking unit, and the second checking unit checks the data;
if the received data is valid data, the slave station equipment executes command data sent by the master station equipment and replies a data command to the master station equipment, and meanwhile, receives data on the redundant BLVDS bus but does not process the data on the redundant BLVDS bus;
if the received data is invalid data, the second bus data transceiver unit receives the data of the redundant BLVDS bus and sends the data to the second checking unit; the second checking unit checks the data received by the second bus data receiving unit on the redundant BLVDS bus in the same checking mode as the default BLVDS bus;
if the data on the redundant BLVDS bus is valid data, the slave station equipment executes command data sent by the master station equipment and replies a data command to the master station equipment;
if the data on the redundant BLVDS bus is invalid data, the received data is not processed, the number of times of receiving errors is recorded, and the master station equipment is waited to send again;
if 3 consecutive occurrences: and if the data sent by the default BLVDS bus and the redundant BLVDS bus are invalid data, the first bus data transceiving unit stops sending the data and closes the buses.
It should be noted that, the data replied by the slave device is also returned to the first bus data transceiver unit of the master device according to the communication mechanism of the redundant BLVDS bus, that is, the default BLVDS bus and the redundant BLVDS bus, and when the first bus data transceiver unit of the master device receives the data replied from the default BLVDS bus or the redundant BLVDS bus, the first check unit may also verify the validity of the replied data in the same check manner as the second check unit. The method comprises the following specific steps:
when the slave station equipment replies a data command to the master station equipment, the second bus data receiving and transmitting unit can transmit data to the first bus data receiving and transmitting unit of the master station equipment through the default BLVDS bus and the redundant BLVDS bus in sequence; wherein:
the first bus data transceiver unit of the master station device firstly receives data of a default BLVDS bus, and sends the received data to the first checking unit, and the first checking unit can check the data in the same checking mode as the second checking unit;
if the received data is valid data, the master station equipment executes a data command sent by the slave station equipment and replies command data to the slave station equipment, and meanwhile, receives data on the redundant BLVDS bus but does not process the data on the redundant BLVDS bus;
if the received data is invalid data, the first bus data receiving and transmitting unit receives the data of the redundant BLVDS bus and transmits the data to the first checking unit; the first checking unit checks the data on the redundant BLVDS bus received by the first bus data receiving unit in the same checking mode as the default BLVDS bus;
if the data on the redundant BLVDS bus is valid data, the master station equipment executes the data command sent by the slave station equipment and replies command data to the slave station equipment;
if the data on the redundant BLVDS bus is invalid data, the received data is not processed, the number of times of receiving errors is recorded, and the slave station equipment is waited to send again;
if 3 consecutive occurrences: and if the data sent by the default BLVDS bus and the redundant BLVDS bus are invalid data, the second bus data transceiver unit stops sending the data and closes the buses.
Referring to fig. 2, the embodiment also discloses a communication method based on the redundant BLVDS bus, which includes the following steps:
s1: establishing the communication system based on the redundant BLVDS bus;
s2: the first bus data transceiver unit of the main station equipment firstly sends data to the default BLVDS bus, and then sends the same data to the redundant BLVDS bus after a certain time interval;
s3: the second bus data transceiver unit of the slave station equipment firstly receives data of a default BLVDS bus, and sends the received data to the second checking unit, and the second checking unit checks the data;
if the received data is valid data, the slave station equipment executes command data sent by the master station equipment, and receives data on the redundant BLVDS bus but does not process the data on the redundant BLVDS bus; proceeding to step S5;
if the received data is invalid data, go to step S4;
s4: the second bus data transceiver unit receives the data of the redundant BLVDS bus and sends the data to the second checking unit; the second checking unit checks the data received by the second bus data receiving unit on the redundant BLVDS bus in the same checking mode as the default BLVDS bus;
if the data on the redundant BLVDS bus is valid data, the slave station equipment executes command data sent by the master station equipment; proceeding to step S5;
if the data on the redundant BLVDS bus is invalid data, the received data is not processed, the number of times of receiving errors is recorded, and the master station equipment is waited to send again; repeating steps S1 to S4;
s5: the slave station equipment replies a data command to the master station equipment, and the data command is transmitted back to the first bus data receiving and transmitting unit of the master station equipment and is processed in the master station equipment; proceeding to step S6;
s6: the system completes one data interaction.
In step S4, if the following occurs 3 times in succession: and if the data sent by the default BLVDS bus and the redundant BLVDS bus are invalid data, the first bus data transceiving unit stops sending the data and closes the buses.
In step S5, when the slave device replies a data command to the master device, the second bus data transceiver unit may send data to the first bus data transceiver unit of the master device through the default BLVDS bus and the redundant BLVDS bus in sequence.
When the first bus data transceiver unit receives data replied by the default BLVDS bus or the redundant BLVDS bus, the first verification unit verifies the validity of the replied data in the same verification manner as the second verification unit.
The method comprises the following specific steps:
the first bus data transceiver unit of the master station device firstly receives data of a default BLVDS bus, and sends the received data to the first checking unit, and the first checking unit can check the data in the same checking mode as the second checking unit;
if the received data is valid data, the master station equipment executes a data command sent by the slave station equipment and replies command data to the slave station equipment, and meanwhile, receives data on the redundant BLVDS bus but does not process the data on the redundant BLVDS bus;
if the received data is invalid data, the first bus data receiving and transmitting unit receives the data of the redundant BLVDS bus and transmits the data to the first checking unit; the first checking unit checks the data on the redundant BLVDS bus received by the first bus data receiving unit in the same checking mode as the default BLVDS bus;
if the data on the redundant BLVDS bus is valid data, the master station equipment executes the data command sent by the slave station equipment and replies command data to the slave station equipment;
if the data on the redundant BLVDS bus is invalid data, the received data is not processed, the number of times of receiving errors is recorded, and the slave station equipment is waited to send again;
if 3 consecutive occurrences: and if the data sent by the default BLVDS bus and the redundant BLVDS bus are invalid data, the second bus data transceiver unit stops sending the data and closes the buses.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (8)
1. A communication system based on a redundant BLVDS bus comprises a master station device and a plurality of slave station devices, and is characterized in that the master station device and the plurality of slave station devices are connected together through a default BLVDS bus and a redundant BLVDS bus to form a bus topology;
the master station equipment comprises a first checking unit, an address allocation unit and a first bus data receiving and transmitting unit;
each slave station device comprises a second checking unit, an address receiving unit and a second bus data transceiving unit;
after the power is on, the master station equipment allocates a dynamic address to each slave station equipment through the address allocation unit;
the slave station equipment receives the dynamic address allocated by the master station equipment through the address receiving unit;
the address distribution unit is connected with the address receiving unit through an address distribution line;
the first bus data receiving and transmitting unit and the second bus data receiving and transmitting unit are used for realizing data interaction between the master station device and the slave station device; the default BLVDS bus and the redundant BLVDS bus are connected, and data on the default BLVDS bus and the redundant BLVDS bus are received and sent;
the first checking unit is connected with the first bus data receiving and sending unit and used for verifying whether the data command received by the first bus data receiving and sending unit is valid data or not;
and the second checking unit is connected with the second bus data transceiving unit and used for checking whether the data command received from the second bus data transceiving unit is valid data or not.
2. The system of claim 1, wherein the first bus data transceiver unit transmits data to the second bus data transceiver unit of each slave device via the default BLVDS bus and the redundant BLVDS bus in sequence.
3. The system of claim 2, wherein the first bus data transceiver unit of the master device transmits data to the default BLVDS bus first, and transmits the same data to the redundant BLVDS bus after a certain time interval;
the second bus data transceiver unit of the slave station device firstly receives the data of the default BLVDS bus, and sends the received data to the second checking unit, and the second checking unit checks the data;
if the received data is valid data, the slave station equipment executes command data sent by the master station equipment and replies a data command to the master station equipment, and meanwhile, receives data on the redundant BLVDS bus but does not process the data on the redundant BLVDS bus;
if the received data is invalid data, the second bus data transceiver unit receives the data of the redundant BLVDS bus and sends the data to the second checking unit; the second checking unit checks the data received by the second bus data receiving unit on the redundant BLVDS bus in the same checking mode as the default BLVDS bus;
if the data on the redundant BLVDS bus is valid data, the slave station equipment executes command data sent by the master station equipment and replies a data command to the master station equipment;
if the data on the redundant BLVDS bus is invalid data, the received data is not processed, the number of times of receiving errors is recorded, and the master station equipment is waited to send again;
if 3 consecutive occurrences: and if the data sent by the default BLVDS bus and the redundant BLVDS bus are invalid data, the first bus data transceiving unit stops sending the data and closes the buses.
4. The system of claim 3,
when the slave station equipment replies a data command to the master station equipment, the second bus data receiving and transmitting unit can transmit data to the first bus data receiving and transmitting unit of the master station equipment through the default BLVDS bus and the redundant BLVDS bus in sequence; wherein:
the first bus data transceiver unit of the master station device firstly receives data of a default BLVDS bus, and sends the received data to the first checking unit, and the first checking unit can check the data in the same checking mode as the second checking unit;
if the received data is valid data, the master station equipment executes a data command sent by the slave station equipment and replies command data to the slave station equipment, and meanwhile, receives data on the redundant BLVDS bus but does not process the data on the redundant BLVDS bus;
if the received data is invalid data, the first bus data receiving and transmitting unit receives the data of the redundant BLVDS bus and transmits the data to the first checking unit; the first checking unit checks the data on the redundant BLVDS bus received by the first bus data receiving unit in the same checking mode as the default BLVDS bus;
if the data on the redundant BLVDS bus is valid data, the master station equipment executes the data command sent by the slave station equipment and replies command data to the slave station equipment;
if the data on the redundant BLVDS bus is invalid data, the received data is not processed, the number of times of receiving errors is recorded, and the slave station equipment is waited to send again;
if 3 consecutive occurrences: and if the data sent by the default BLVDS bus and the redundant BLVDS bus are invalid data, the second bus data transceiver unit stops sending the data and closes the buses.
5. A communication method based on a redundant BLVDS bus, comprising the steps of:
s1: establishing a redundant BLVDS bus based communication system of any of claims 1 to 4;
s2: the first bus data transceiver unit of the main station equipment firstly sends data to the default BLVDS bus, and then sends the same data to the redundant BLVDS bus after a certain time interval;
s3: the second bus data transceiver unit of the slave station equipment firstly receives data of a default BLVDS bus, and sends the received data to the second checking unit, and the second checking unit checks the data;
if the received data is valid data, the slave station equipment executes command data sent by the master station equipment, and receives data on the redundant BLVDS bus but does not process the data on the redundant BLVDS bus; proceeding to step S5;
if the received data is invalid data, go to step S4;
s4: the second bus data transceiver unit receives the data of the redundant BLVDS bus and sends the data to the second checking unit; the second checking unit checks the data received by the second bus data receiving unit on the redundant BLVDS bus in the same checking mode as the default BLVDS bus;
if the data on the redundant BLVDS bus is valid data, the slave station equipment executes command data sent by the master station equipment; proceeding to step S5;
if the data on the redundant BLVDS bus is invalid data, the received data is not processed, the number of times of receiving errors is recorded, and the master station equipment is waited to send again; repeating steps S1 to S4;
s5: the slave station equipment replies a data command to the master station equipment, and the data command is transmitted back to the first bus data receiving and transmitting unit of the master station equipment and is processed in the master station equipment; proceeding to step S6;
s6: the system completes one data interaction.
6. The method of claim 5, wherein in step S4, if there are 3 consecutive occurrences: and if the data sent by the default BLVDS bus and the redundant BLVDS bus are invalid data, the first bus data transceiving unit stops sending the data and closes the buses.
7. The method of claim 5, wherein in step S5, when the slave device replies with a data command to the master device, the second bus data transceiver unit transmits data to the first bus data transceiver unit of the master device via the default BLVDS bus and the redundant BLVDS bus.
8. The method of claim 7,
the first bus data transceiver unit of the master station device firstly receives data of a default BLVDS bus, and sends the received data to the first checking unit, and the first checking unit can check the data in the same checking mode as the second checking unit;
if the received data is valid data, the master station equipment executes a data command sent by the slave station equipment and replies command data to the slave station equipment, and meanwhile, receives data on the redundant BLVDS bus but does not process the data on the redundant BLVDS bus;
if the received data is invalid data, the first bus data receiving and transmitting unit receives the data of the redundant BLVDS bus and transmits the data to the first checking unit; the first checking unit checks the data on the redundant BLVDS bus received by the first bus data receiving unit in the same checking mode as the default BLVDS bus;
if the data on the redundant BLVDS bus is valid data, the master station equipment executes the data command sent by the slave station equipment and replies command data to the slave station equipment;
if the data on the redundant BLVDS bus is invalid data, the received data is not processed, the number of times of receiving errors is recorded, and the slave station equipment is waited to send again;
if 3 consecutive occurrences: and if the data sent by the default BLVDS bus and the redundant BLVDS bus are invalid data, the second bus data transceiver unit stops sending the data and closes the buses.
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Cited By (3)
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| CN114978417A (en) * | 2022-03-29 | 2022-08-30 | 浙江大学 | Data communication verification method and system based on two BLVDS buses |
| CN115277295A (en) * | 2022-07-29 | 2022-11-01 | 广东美的智能科技有限公司 | Communication method of controller and controller |
| CN116980497A (en) * | 2023-09-20 | 2023-10-31 | 浙江中控研究院有限公司 | Configurable CANopen master station system based on BLVDS bus and implementation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114978417A (en) * | 2022-03-29 | 2022-08-30 | 浙江大学 | Data communication verification method and system based on two BLVDS buses |
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| CN116980497A (en) * | 2023-09-20 | 2023-10-31 | 浙江中控研究院有限公司 | Configurable CANopen master station system based on BLVDS bus and implementation method |
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Application publication date: 20200609 |