CN110474828B - MBUS bus communication method and system - Google Patents
MBUS bus communication method and system Download PDFInfo
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- CN110474828B CN110474828B CN201910927572.7A CN201910927572A CN110474828B CN 110474828 B CN110474828 B CN 110474828B CN 201910927572 A CN201910927572 A CN 201910927572A CN 110474828 B CN110474828 B CN 110474828B
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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
- H04L61/5046—Resolving address allocation conflicts; Testing of addresses
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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
- H04L12/403—Bus networks with centralised control, e.g. polling
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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
- H04L12/407—Bus networks with decentralised control
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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
- H04L2012/40228—Modbus
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Abstract
The invention discloses a MBUS bus communication method and a system, belonging to the instrument communication and control technology, comprising the following steps: the MBUS master accesses a command to the MBUS slave through the MBUS bus so that the MBUS slave uploads the acquired data to the MBUS master according to the access command; when the MBUS master does not send an access command to a certain MBUS slave machine after the set time t, the MBUS slave machine is determined to accord with the condition of actively reporting data, and the MBUS master machine receives the data actively uploaded by the MBUS slave machine. According to the invention, the active data reporting mode of the MBUS slave machine is additionally arranged, so that the polling frequency of the MBUS host machine is reduced, and the power consumption of the system is reduced.
Description
Technical Field
The invention relates to the technical field of instrument communication and control, in particular to a MBUS bus communication method and system.
Background
With the development of intelligent heating technology, heat meters, intelligent control valves, user pipe pressure sensors and the like are used by each household in a central heating system, a plurality of heat meters and intelligent control valves are used as slave machines, the pressure sensors are connected to an MBUS host machine through an MBUS bus, and one MBUS host machine can carry up to 250 slave machine nodes. The slave node is used for monitoring data, including flow data, backwater temperature data, opening data of an intelligent valve management valve and the like, and when the monitoring data is abnormal, the slave node needs to upload the data to the MBUS host in time.
In the existing scheme, an MBUS master polling communication mode is used, and the MBUS master is required to continuously poll each slave node, and the slave reports data. It has the disadvantages that: firstly, the real-time performance is poor, usually, a plurality of 250 slave nodes are arranged on the MBUS bus, the communication between the master and each MBUS slave node needs about 1.5 seconds, and a long time is needed after the access of each slave node on the bus is completed. Secondly, the power consumption of the system is increased, and the power consumption of each node for accessing once is about 300 mW. And thirdly, the slave machine cannot actively report data, and if the slave machine needs to upload data, the slave machine can upload the data only when the master machine polls the slave machine.
The communication mode of polling by the MBUS master not only causes poor real-time performance of uploading data from the slave, but also wastes more electric energy during master polling, and the traditional MBUS bus reduces the adaptability of application in a plurality of fields due to the own communication mode.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and realize the function of actively reporting data by the MBUS slave machine.
To achieve the above object, in one aspect, an MBUS bus communication method is used for communication between an MBUS master and an MBUS slave, and includes the following steps:
the MBUS master sends an access command to the MBUS slave machine through the MBUS bus so that the MBUS slave machine uploads the acquired data to the MBUS master machine according to the access command;
when the MBUS master does not send an access command to a certain MBUS slave machine after the set time t, the MBUS slave machine is determined to accord with the condition of actively reporting data, and the MBUS master machine receives the data actively uploaded by the MBUS slave machine.
Further, still include:
the MBUS host converts the TTL signal into a pulse voltage signal which can be recognized by the MBUS slave machine and is used as the access command;
and the MBUS host converts pulse voltage signals sent by the MBUS slave through an MBUS bus into TTL signals and receives the TTL signals through a serial port of the MBUS host.
Further, before the MBUS master sends an access command to an MBUS slave, the method further includes:
and the MBUS master distributes a communication address to each MBUS slave according to slave information issued remotely, wherein the slave information comprises the MBUS slave address.
Further, still include:
the MBUS host judges whether the multi-slave data concurrency conflict exists on the MBUS bus or not according to the pulse current on the MBUS bus;
if so, the MBUS master manages an MBUS bus, and sends an address uploading command to the MBUS slave so that the MBUS slave uploads slave address data to the MBUS master;
and the MBUS master sends the access command to the MBUS slave according to the received slave address data so as to read the data collected by the MBUS slave.
Further, the method for judging whether the multi-slave data concurrency conflict exists on the MBUS bus by the MBUS master according to the pulse current on the MBUS bus includes:
judging whether the pulse current on the MBUS bus is larger than a current set value or not;
if yes, determining that the multi-slave data concurrency conflict exists on the MBUS bus;
if not, determining that no multi-slave data concurrency conflict exists on the MBUS bus.
Further, after the sending an upload address command to the MBUS slave, the method further includes:
and the MBUS master receives the slave address data uploaded by the MBUS slave in the receiving time, wherein the receiving time is the product of the number of the MBUS slaves and the time required by a single MBUS slave to send the address.
Further, after the MBUS slave machine receives the access command issued by the MBUS host machine, the MBUS slave machine which accords with the active data reporting condition sequentially uploads the address data to the MBUS host machine according to a set delay sequence.
In another aspect, an MBUS bus communication system is used, comprising: the system comprises an MBUS host, an MBUS bus and n MBUS slave machines, wherein the n MBUS slave machines are connected with the MBUS host through the MBUS bus, and n is more than or equal to 1; the MBUS slave machine comprises a command receiving module, a data sending module and a judging module, and the MBUS host machine comprises a receiving and sending module, wherein:
the receiving and transmitting module sends an access command to the command receiving module;
the data sending module sends the data collected by the MBUS slave machine to the receiving and sending module according to the access command received by the command receiving module;
the judging module is used for judging whether the transceiver module does not send an access command to the transceiver module after the set time t is exceeded;
when the output result of the judging module is yes, the data sending module determines that the MBUS slave machine meets the condition of actively reporting data, and the data sending module actively sends the acquired data to the receiving and sending module;
and the command receiving module waits for receiving the access command issued by the transceiving module when the output result of the judging module is negative.
Furthermore, the MBUS host also comprises an arbitration processing module and a concurrency conflict detection module, the MBUS slave is connected with the arbitration processing module through the concurrency conflict detection module, and the arbitration processing module is connected with the transceiver module;
the concurrency conflict detection module is used for judging whether the multi-slave data concurrency conflict exists on the MBUS bus according to the pulse current on the MBUS bus;
when the data of the multiple slave machines conflict concurrently, the concurrent conflict detection module sends a bus level signal to the arbitration processing module;
the arbitration processing module is used for managing the MBUS bus according to the received bus level signal and sending an uploading address command to the command receiving module;
the data sending module sends slave address data to the receiving and sending module after the command receiving module receives the uploading address command;
and the transceiver module sends the access command to the command receiving module according to the slave address data.
Further, the concurrent conflict detection module comprises a judgment unit and a determination unit;
the judging unit is used for judging whether the pulse current on the MBUS bus is larger than a current set value or not;
the determining unit is used for determining that the MBUS bus has multi-slave data concurrency conflict when the output result of the judging unit is yes;
the determining unit is used for determining that no multi-slave data concurrency conflict exists on the MBUS bus when the output result of the judging unit is negative.
Compared with the prior art, the invention has the following technical effects: the MBUS bus communication method comprises a normal communication mode and an MBUS slave machine active uploading mode, wherein the normal communication mode is as follows: the MBUS master manages the MBUS bus, and data communication is carried out in a mode that the master actively accesses the slave. The MBUS slave machine active uploading mode is as follows: after the MBUS host finishes issuing the access command, if the MBUS host still does not send the next access command after the set time is exceeded, the MBUS slave considers that the MBUS bus enters an idle state, at the moment, when the MBUS slave needs to report data, an active data reporting mode is started, the MBUS slave directly uploads the data to the MBUS host, and the MBUS normally receives the data. By additionally arranging the MBUS slave machine active data reporting mode, the polling frequency of the MBUS master machine is reduced, and therefore the power consumption of the system is reduced.
Drawings
The following detailed description of embodiments of the invention refers to the accompanying drawings in which:
FIG. 1 is a flow chart diagram of an MBUS bus communication method;
FIG. 2 is a state diagram of the communication between the MBUS master and the MBUS slave;
fig. 3 is a schematic structural diagram of an MBUS bus communication system.
Detailed Description
To further illustrate the features of the present invention, refer to the following detailed description of the invention and the accompanying drawings. The drawings are for reference and illustration purposes only and are not intended to limit the scope of the present disclosure.
As shown in fig. 1-2, the present embodiment discloses an MBUS bus communication method for communication between an MBUS master and an MBUS slave, including the following steps S1 to S2:
s1, the MBUS master sends an access command to the MBUS slave machine through the MBUS bus so that the MBUS slave machine uploads the acquired data to the MBUS master machine according to the access command;
and S2, when the MBUS master does not send an access command to a certain MBUS slave machine after the set time t is exceeded, determining that the MBUS slave machine meets the condition of actively reporting data, and receiving the data actively uploaded by the MBUS slave machine by the MBUS master machine.
It should be noted that the MBUS bus operation mode in this embodiment includes a normal communication mode and an MBUS slave active upload mode. The normal communication mode is that the MBUS master accesses a command to the MBUS slave through the MBUS bus, so that the MBUS slave uploads the acquired data to the MBUS master according to the access command. The MBUS slave machine active uploading mode is as follows: after the MBUS host finishes issuing the access command, if the MBUS host does not send the next access instruction after the set time t is exceeded, the MBUS slave which needs to upload data actively uploads the data to the MBUS host.
Specifically, the set time t is determined according to the communication rate of the system, and the set time t in this embodiment is generally between 0.5s and 3 s.
It should be noted that, the MBUS generally uses 2400bps rate, each byte has 10 bits, a segment of message is about 70 bytes, and the master issues the message and the slave uploads the message. The time t can be set accordingly by the person skilled in the art.
Further, the MBUS host converts a TTL signal sent through a serial port into a pulse voltage signal which can be recognized by the MBUS slave machine and is used as the access command;
and the MBUS host converts pulse voltage signals sent by the MBUS slave through an MBUS bus into TTL signals and receives the TTL signals through a serial port of the MBUS host.
Specifically, the MBUS slave machine uploads data by using a pulse voltage signal, and the current is 15-20 mA.
Further, before the MBUS master sends the access command to the MBUS slave, the method further includes step S0: redefining the address of the MBUS slave, wherein the redefining process of the address is as follows:
and the MBUS master distributes a communication address to each MBUS slave according to slave information issued remotely, wherein the slave information comprises the MBUS slave address.
Specifically, when the local MBUS bus system is used, the MBUS master uses two-byte data to reallocate the communication address of each MBUS slave in the system according to the number of the MBUS slaves in the system by using the MBUS slave information file issued remotely, and the MBUS master uses a new address allocated to the MBUS slave in the subsequent MBUS bus communication for communication.
In particular, the conventional address of the slave is set at the time of product shipment, and is typically an address of 4-6 bytes. In the embodiment, the number of the slave machines loaded in the MBUS bus is determined, and 2 bytes, 1.5 bytes or 1 byte is adopted, so that the communication speed is improved, and the communication time is shortened.
Further, on the basis of the disclosure of the foregoing embodiments, the present embodiment further sets a contention conflict arbitration mechanism, which specifically includes the following steps:
s3, the MBUS master judges whether the MBUS bus has multi-slave data concurrency conflict according to the pulse current on the MBUS bus, if not, the step S4 is executed, and if yes, the step S5 is executed;
s4, the MBUS host sends response data after successfully receiving the data;
s5, the MBUS master manages an MBUS bus, and an uploading address command is sent to the MBUS slave so that the MBUS slave uploads slave address data to the MBUS master;
and S6, the MBUS master sends the access command to the MBUS slave according to the received slave address data so as to read the data collected by the MBUS slave.
It should be noted that, in this embodiment, when it is detected that there is a multi-machine data concurrency conflict on the MBUS bus, the MBUS bus is started to perform the normal communication mode, that is, the voltage communication mode controlled by the MBUS master, and the MBUS master broadcasts and issues a multi-machine data concurrency state, so as to notify the MBUS slave that there is a multi-machine concurrency state.
Further, the above step S3: the MBUS master judges whether the multi-slave data concurrency conflict exists on the MBUS bus according to the pulse current on the MBUS bus, and specifically comprises the following subdivision steps S31 to S33:
s31, judging whether the pulse current on the MBUS bus is larger than a current set value, if so, executing a step S32, otherwise, executing a step S33;
s32, determining that multiple slave computer data concurrency conflicts exist on the MBUS bus;
and S33, determining that no multi-slave data concurrency conflict exists on the MBUS bus.
In practical application, the communication current of a single MBUS slave is generally 15-20 mA, and the value range of the current set value is set to be 28-35 mA in the embodiment.
Further, in step S4, the uploading, by the MBUS slave, slave address data to the MBUS master specifically includes: after the MBUS slave machine receives the access command issued by the MBUS host machine, the MBUS slave machine which accords with the active data reporting condition sequentially uploads the address data to the MBUS host machine according to the set time delay sequence.
It should be noted that, in the embodiment, the set delay order is obtained by multiplying a time constant (a single time constant of 0.2S) by the reallocated slave address. The purpose is to transmit only the local address when the slave device transmits data again, so that the data speckle is short and the collision is avoided again.
Further, in step S4, after the MBUS master sends the address uploading command to the MBUS slave, the method further includes:
and the MBUS master receives the slave address data uploaded by the MBUS slave in the receiving time, wherein the receiving time is the product of the number of the MBUS slaves and the time required by a single MBUS slave to send the address.
It should be noted that, in this embodiment, a multi-machine concurrency conflict arbitration mechanism is added at the MBUS host end, so as to optimize a communication protocol (when a slave receives a multi-machine concurrency state issued by the host, when the slave needs to actively report data, the slave waits for a delay, and after the waiting time is over, uploads the address data thereof.
As shown in fig. 3, the present embodiment discloses an MBUS bus communication system, including: the system comprises an MBUS host 10, an MBUS bus 20 and n MBUS slave machines 30, wherein the n MBUS slave machines 30 are connected with the MBUS host 10 through the MBUS bus 20, and n is more than or equal to 1; the MBUS slave 30 includes a command receiving module, a data transmitting module, and a determining module, and the MBUS master 10 includes a transceiver module 11, wherein:
the transceiving module 11 sends an access command to the command receiving module;
the data sending module sends the data collected by the MBUS slave 30 to the transceiver module 11 according to the access command received by the command receiving module;
the judging module is used for judging whether the transceiver module 11 does not send an access command to the transceiver module over the set time t;
when the output result of the judging module is yes, the data sending module determines that the MBUS slave machine 30 meets the condition of actively reporting data, and the data sending module actively sends the acquired data to the transceiving module;
and the command receiving module waits for receiving the access command issued by the transceiver module 11 when the output result of the judging module is negative.
Furthermore, the MBUS master 10 further includes an arbitration processing module 12 and a concurrent conflict detection module 13, the MBUS slave is connected to the arbitration processing module 12 through the concurrent conflict detection module 13, and the arbitration processing module 12 is connected to the transceiver module 11;
the concurrency conflict detection module 13 is configured to determine whether there is a multi-slave data concurrency conflict on the MBUS bus 20 according to the pulse current on the MBUS bus 20;
when the data of the multiple slaves conflict concurrently, the concurrent conflict detection module 13 sends a bus level signal to the arbitration processing module 12;
the arbitration processing module 12 is configured to manage the MBUS bus 20 according to the received bus level signal, and send an upload address command to the command receiving module;
the data sending module sends slave address data to the transceiver module 11 after the command receiving module receives the upload address command;
the transceiver module 11 sends the access command to the command receiving module according to the slave address data.
Further, the concurrent collision detection module 13 includes a judgment unit and a determination unit;
the judging unit is used for judging whether the pulse current on the MBUS bus 20 is larger than a current set value;
the determining unit is used for determining that the MBUS bus 20 has multi-slave data concurrency conflict when the output result of the judging unit is yes;
the determining unit is used for determining that no multi-slave data concurrency conflict exists on the MBUS bus 20 when the output result of the judging unit is negative.
It should be noted that the communication mode of the MBUS bus 20 provided by the present embodiment has the following advantages: (1) the communication efficiency is improved by simplifying the address of the slave; (2) the slave machine is allowed to report actively, the traditional host polling mode is not needed, and the power consumption is reduced; (3) the conflict detection and arbitration mechanism allows the slave machine to report the address only, so that the communication time is shortened, the efficiency is improved, and the power consumption is reduced; (4) and the slave machine actively reports the mode, expands the application mode of the MBUS bus 20 and improves the applicability.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. An MBUS bus communication method, which is used for communication between an MBUS master and an MBUS slave, and comprises the following steps:
the MBUS master sends an access command to the MBUS slave machine through the MBUS bus so that the MBUS slave machine uploads the acquired data to the MBUS master machine according to the access command;
when the MBUS master does not send an access command to a certain MBUS slave machine after the set time t, the MBUS slave machine is determined to accord with the condition of actively reporting data, and the MBUS master machine receives the data actively uploaded by the MBUS slave machine.
2. The MBUS bus communication method of claim 1, further comprising:
the MBUS host converts the TTL signal into a pulse voltage signal which can be recognized by the MBUS slave machine and is used as the access command;
and the MBUS host converts pulse voltage signals sent by the MBUS slave through an MBUS bus into TTL signals and receives the TTL signals through a serial port of the MBUS host.
3. The MBUS bus communication method of claim 1, further comprising, prior to the MBUS master sending an access command to an MBUS slave:
and the MBUS master distributes a communication address to each MBUS slave according to slave information issued remotely, wherein the slave information comprises the MBUS slave address.
4. The MBUS bus communication method of claim 2, further comprising:
the MBUS host judges whether the multi-slave data concurrency conflict exists on the MBUS bus or not according to the pulse current on the MBUS bus;
if so, the MBUS master manages an MBUS bus, and sends an address uploading command to the MBUS slave so that the MBUS slave uploads slave address data to the MBUS master;
and the MBUS master sends the access command to the MBUS slave according to the received slave address data so as to read the data collected by the MBUS slave.
5. The MBUS bus communication method of claim 4, wherein the MBUS master judges whether the multi-slave data concurrency conflict exists on the MBUS bus according to the pulse current on the MBUS bus, and the method comprises the following steps:
judging whether the pulse current on the MBUS bus is larger than a current set value or not;
if yes, determining that the multi-slave data concurrency conflict exists on the MBUS bus;
if not, determining that no multi-slave data concurrency conflict exists on the MBUS bus.
6. The MBUS bus communication method of claim 4, further comprising, after the sending an upload address command to the MBUS slave:
and the MBUS master receives the slave address data uploaded by the MBUS slave in the receiving time, wherein the receiving time is the product of the number of the MBUS slaves and the time required by a single MBUS slave to send the address.
7. The MBUS bus communication method of claim 4, wherein after the MBUS slave machine receives the access command issued by the MBUS master machine, the MBUS slave machine which meets the active data reporting condition sequentially uploads the address data to the MBUS master machine according to a set delay sequence.
8. An MBUS bus communication system, comprising: the system comprises an MBUS host, an MBUS bus and n MBUS slave machines, wherein the n MBUS slave machines are connected with the MBUS host through the MBUS bus, and n is more than or equal to 1; the MBUS slave machine comprises a command receiving module, a data sending module and a judging module, and the MBUS host machine comprises a receiving and sending module, wherein:
the receiving and transmitting module sends an access command to the command receiving module;
the data sending module sends the data collected by the MBUS slave machine to the receiving and sending module according to the access command received by the command receiving module;
the judging module is used for judging whether the transceiver module does not send an access command to the transceiver module after the set time t is exceeded;
when the output result of the judging module is yes, the data sending module determines that the MBUS slave machine meets the condition of actively reporting data, and the data sending module actively sends the acquired data to the receiving and sending module;
and the command receiving module waits for receiving the access command issued by the transceiving module when the output result of the judging module is negative.
9. The MBUS bus communication system as claimed in claim 8, wherein the MBUS master further comprises an arbitration processing module and a concurrency collision detection module, the MBUS slave is connected to the arbitration processing module via the concurrency collision detection module, and the arbitration processing module is connected to the transceiver module;
the concurrency conflict detection module is used for judging whether the multi-slave data concurrency conflict exists on the MBUS bus according to the pulse current on the MBUS bus;
when the data of the multiple slave machines conflict concurrently, the concurrent conflict detection module sends a bus level signal to the arbitration processing module;
the arbitration processing module is used for managing the MBUS bus according to the received bus level signal and sending an uploading address command to the command receiving module;
the data sending module sends slave address data to the receiving and sending module after the command receiving module receives the uploading address command;
and the transceiver module sends the access command to the command receiving module according to the slave address data.
10. The MBUS bus communication system of claim 9, wherein the concurrent collision detection module comprises a determination unit and a determination unit;
the judging unit is used for judging whether the pulse current on the MBUS bus is larger than a current set value or not;
the determining unit is used for determining that the MBUS bus has multi-slave data concurrency conflict when the output result of the judging unit is yes;
the determining unit is used for determining that no multi-slave data concurrency conflict exists on the MBUS bus when the output result of the judging unit is negative.
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| CN111327114B (en) * | 2020-03-11 | 2023-02-03 | 瑞纳智能设备股份有限公司 | MBUS bus power supply system and multi-slave node load balancing method |
| CN112398716B (en) * | 2020-11-12 | 2022-05-20 | 深圳云顶智慧科技有限公司 | Low-cost MBUS host circuit |
| CN115085758A (en) * | 2022-06-10 | 2022-09-20 | 贵州电网有限责任公司 | Dual-transceiver multi-mode RS-485 communication host and working method |
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