CN115277867A

CN115277867A - Collector and electric power communication method and system of Modbus protocol equipment based on collector

Info

Publication number: CN115277867A
Application number: CN202210720438.1A
Authority: CN
Inventors: 崔健; 董海涛; 王春发
Original assignee: Qingdao Eastsoft Communication Technology Co Ltd
Current assignee: Qingdao Eastsoft Communication Technology Co Ltd
Priority date: 2022-06-23
Filing date: 2022-06-23
Publication date: 2022-11-01

Abstract

The invention belongs to the technical field of distribution Internet of things, and particularly relates to a power communication method of Modbus protocol equipment based on a collector, which comprises the following steps: s1, expanding 645 protocol data, and containing serial port baud rate and check bit information of Modbus equipment in a data domain of a 645 protocol message according to protocol specification; s2, receiving a 645 protocol message sent by an upper layer terminal by using a collector, analyzing the 645 protocol message by the collector, extracting serial port configuration information, register address information and a Modbus message in the 645 protocol message, and configuring a serial port baud rate and a check bit according to the serial port configuration information; s3, after the serial port configuration is completed, the collector converts the message protocol type into Modbus and then sends the Modbus message to a device adopting the Modbus protocol; and S4, after receiving the data returned by the Modbus protocol equipment, the collector converts the protocol type into a 645 type and organizes a 645 message to be sent back to the upper-layer terminal. The invention expands a 645 protocol and realizes the remote communication of Modbus protocol equipment.

Description

Collector and electric power communication method and system of Modbus protocol equipment based on collector

Technical Field

The invention belongs to the technical field of power distribution Internet of things, and particularly relates to a power communication method of Modbus protocol equipment based on a collector.

Background

Along with the continuous extension of distribution internet of things application demand, to the electric quantity, switching value, the environmental quantity monitoring in the platform district, need to realize different equipment adaptations, realize extensive thing allies oneself with the access.

HPLC is a high-speed power line carrier, also known as a broadband power line carrier, and is a broadband power line carrier technology for the transmission of data on low-voltage power lines. The broadband power line carrier communication network is a communication network which takes a power line as a communication medium and realizes the convergence, transmission and interaction of the power utilization information of low-voltage users. The broadband power line carrier mainly adopts Orthogonal Frequency Division Multiplexing (OFDM), and the frequency band uses 2MHz-12MHz. Compared with the traditional low-speed narrowband power line carrier technology, the HPLC technology has the advantages of reaching the bandwidth and high transmission rate, and can meet the higher requirement of low-voltage power line carrier communication.

The 645 protocol is a communication protocol for a multifunctional electric energy meter approved by the ministry of the people's republic of china at 1998, month 2, and is executed at month 6. The principle of residual 3 coding is adopted during data field transmission; the data grouping and the identification coding ensure the rapidness and convenience of data transmission and take account of the expandability of information. The protocol standard is suitable for a charge rate device of a multifunctional electric energy meter in a local system and a hand-held unit (HHU) or other data terminal equipment to carry out point-to-point or one-master-multi-slave data exchange mode, physical connection, communication link and application technical specifications among the charge rate device and the hand-held unit (HHU) are specified, and a 645 protocol is the most used electric energy meter protocol in China.

In the existing and widely applied power line communication protocols, the communication protocol mainly comprises a 645 protocol, a 698 protocol and a 376.2 protocol, and does not support the transmission of Modbus protocol messages on a power line; the centralized meter reading scheme in the prior art adopts an I-type or II-type collector scheme for accessing the RS485 electric energy meter except a carrier module, and cannot effectively access an intelligent power distribution system aiming at equipment without an uplink communication function, such as a molded case circuit breaker, a meter rear micro-breaker, an intelligent capacitor, a charging pile, various sensors and the like, so that the large data acquisition, application and control of power equipment are limited, and if the equipment is completely replaced on site, the equipment cost and construction cost are high, and the operability is not strong.

Therefore, the communication method of the power equipment in the prior art needs to be improved so as to adapt to the communication of various equipment, so as to realize wide internet of things in the field of power communication.

Disclosure of Invention

In order to meet the actual requirements in the field of power communication, the invention overcomes the defects in the prior art and solves the technical problems that: a collector and a power communication method and system of Modbus protocol equipment based on the collector are provided, so that communication between a remote device and the Modbus protocol Internet of things equipment is achieved.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a power communication method of Modbus protocol equipment based on a collector is realized based on the collector and comprises the following steps:

s1, expanding 645 protocol data, and containing serial port baud rate and check bit information of Modbus equipment in a data field of 645 protocol messages according to protocol specification;

s2, receiving a 645 protocol message sent by an upper layer terminal by using a collector, analyzing the 645 protocol message by the collector, extracting serial port configuration information, register address information and a Modbus message in the 645 protocol message, and configuring a serial port baud rate and a check bit according to the serial port configuration information;

s3, after the serial port configuration is completed, the collector converts the message protocol type into Modbus and then sends the Modbus message to a device adopting the Modbus protocol;

and S4, after receiving the data returned by the Modbus protocol equipment, the collector converts the protocol type into a 645 type and organizes 645 messages to be sent back to the upper-layer terminal.

The collector comprises a message data analysis module, a carrier communication module, a wireless communication module and a 485 communication module.

The extended 645 protocol data format is as follows:

in the extended 645 protocol, the formats of the uplink frame and downlink frame data fields are as follows:

data content	Data format	Byte number
			Data identification	BIN	4
Register address	BIN	4
			Serial port control	BIN	2
Modbus message	BIN	L

。

In the uplink frame and downlink frame data fields, the data bit format of the serial port control data is as follows:

and in the step S3, when the Modbus message is sent to the Modbus protocol equipment, a timer is set.

In the step S4, if no data is collected after time out, the collector stops receiving the Modbus packet and starts the next cycle.

In step S2, after receiving the 645 protocol packet sent by the upper terminal, the collector determines whether it is related to the Modbus, if so, performs analysis, and if not, completes processing according to the normal service flow.

In addition, the invention also provides a collector which is used for executing the method.

In addition, the invention also provides a Modbus protocol device communication system based on the collector, which comprises Modbus protocol devices, an upper layer terminal and the collector, wherein 645 protocol data of the upper layer terminal are expanded protocol data.

Compared with the prior art, the invention has the following beneficial effects:

1. the invention provides a collector and a power communication method and a power communication system of Modbus protocol equipment based on the collector, wherein a 645 protocol is extended to contain a complete Modbus protocol message into a data field of a 645 message, so that upper-layer terminals such as a concentrator and an intelligent power distribution terminal only need to organize the 645 message according to protocol regulations, the message is transmitted to the collector through a power line, the collector analyzes the 645 message according to the protocol regulations after receiving the message and extracts the Modbus message, and the collector can forward the Modbus message to 485 and wait for reply because the collector communicates with the Modbus equipment through 485; after receiving the reply, packing the received Modbus message into a 645 message according to the protocol specification again, then sending the 645 message to the power line and transmitting the 645 message to the upper layer terminal.

2. Because the baud rate and the check bit of communication of different Modbus protocol devices are different, most of Modbus devices support baud rate configuration, some Modbus devices also support communication check bit configuration, and some Modbus devices are fixed and cannot be changed. In view of the diversity and lack of unified standard of Modbus equipment, the method adopts a mode that communication parameters are read from top to bottom and message band configuration parameters are read, baud rate and check bit information are added into a data field of a 645 protocol message, and the universality of a protocol is improved, so that the method can be suitable for various Modbus protocol equipment. When Modbus protocol equipment is replaced, only the upper layer terminal is needed to modify the sent message, and the collector does not need to change the program, so that the program is more stable and efficient.

Drawings

Fig. 1 is a schematic flowchart of a power communication method of a Modbus protocol device based on a collector according to an embodiment of the present invention;

fig. 2 is a schematic circuit structure diagram of a collector used in the first embodiment of the present invention;

fig. 3 is a schematic structural diagram of a Modbus protocol device communication system based on a collector according to a third embodiment of the present invention.

Detailed description of the preferred embodiments

In order to make the technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to specific embodiments and accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention; all other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example one

The embodiment of the invention provides a power communication method of Modbus protocol equipment based on a collector, which is characterized by being realized based on the collector and comprising the following steps.

S1, expanding 645 protocol data, and containing serial port baud rate and check bit information of Modbus equipment in a data field of a 645 protocol message according to protocol specification.

Specifically, in this embodiment, the protocol contents are extended to 645 as follows: firstly, the RS485 communication rate is adapted to various rates; secondly, the check bits are adaptive to odd check, even check and no check; stop bits, data bits are adaptable; specifically, the extended 645 protocol data format is shown in table 1.

Table 1 extended 645 protocol data format

And (3) control code: 11H, 91H;

data field length: the data length of the Modbus is 4 bytes of data identification +4 bytes of register address +2 bytes of serial port control information + Modbus message length L.

Specifically, in this embodiment, the format of the downlink frame data field is shown in table 2.

TABLE 2 Downlink frame data Domain Format

Data content	Data format	Number of bytes
			Data identification	BIN	4
Register address	BIN	4
			Serial port control	BIN	2
Modbus message	BIN	L

Wherein, including four parts:

1. data identification: 0x04B0FFFF;

2. register address: and 4 bytes are used for storing register address information of the modbus message sent at this time, and no register address is contained in a reply frame of the modbus protocol.

3. And (3) serial port control: 4 bits-baud rate, 2 bits-check, 1 bit-stop bit, 2 bits-data bit, 2 bits-flow control, and the rest reserved. The format of the serial port control data is shown in table 3.

TABLE 3 Serial control data Format

Baud rate: {300bps (0), 600bps (1), 1200bps (2), 2400bps (3), 4800bps (4), 7200bps (5), 9600bps (6), 19200bps (7), 38400bps (8), 57600bps (9), 115200bps (10), adaptive (11) },

checking the bit: { no check (0), odd check (1), even check (2) },

data bit: {5 (0),6 (1),7 (2),8 (3) },

stopping the position: {1 (0),2 (1) },

flow control: { none (0), hardware (1), software (2) }

4. And (3) Modbus message: complete Modbus message information

Specifically, in the present embodiment, the format of the uplink frame data field is shown in table 4.

TABLE 2 uplink frame data field Format

Wherein, including four parts:

1. data identification: 0x04B0FFFF;

2. register address: the 4 bytes are used for storing register address information of the modbus message sent at this time, and no register address is contained in a reply frame of the modbus protocol.

3. And (3) serial port control: 4 bits-baud rate, 2 bits-check, 1 bit-stop bit, 2 bits-data bit, 2 bits-flow control, and the rest reserved. The serial port control data format is the same as the downlink frame, as shown in table 3.

4. And (3) Modbus message: and (4) complete Modbus message information.

S2, receiving a 645 protocol message sent by an upper layer terminal by using a collector, analyzing the 645 protocol message by the collector, extracting serial port configuration information, register address information and a Modbus message in the 645 protocol message, and configuring a serial port baud rate and a check bit according to the serial port configuration information.

Specifically, in step S2, after receiving the 645 protocol packet sent by the upper layer terminal, the collector determines whether the packet is related to the Modbus, if so, performs analysis, and if not, completes processing according to the normal service flow. Upper terminal specifically can be for distribution terminal or concentrator, and the collector possesses power line carrier communication function, and after concentrator or distribution terminal added collector equipment address archives, the collector can communicate according to low pressure power line broadband carrier communication protocol with upper terminal. Specifically, the collector is a type II collector.

And S3, after the serial port configuration is completed, the collector converts the message protocol type into a Modbus, and then sends the Modbus message to a device adopting the Modbus protocol.

And in the step S3, when the Modbus message is sent to the Modbus protocol equipment, the method further comprises the step of setting a timer. The timer is set so as to facilitate timeout processing and serial port waiting receiving processing.

And S4, after receiving the returned data sent by the Modbus protocol equipment, the collector converts the protocol type into a 645 type and organizes 645 messages to send the 645 messages back to the upper-layer terminal.

In the step S4, if no return data is received after time out, the collector stops receiving the Modbus packet, and starts the next cycle.

In this embodiment, the collector checks each received 645 message conforming to the protocol format, and monitors whether the data identifier of the 645 message is related to the Modbus protocol, that is, determines whether the data identifier is 0x04b0ffff. If not, processing according to the normal service flow of the national network second acquisition program; if the message data field is determined to be 0x04b0ffff, firstly extracting 645 information about serial port configuration in the message data field, performing serial port configuration according to a protocol, then extracting a complete Modbus protocol message in the data field, forwarding the message to a 485 line, simultaneously changing the communication protocol type to be the Modbus protocol type by a program, waiting for the response of the Modbus equipment, and ending if the message data field still does not receive data conforming to the Modbus protocol format after timeout; if the message conforming to the protocol format is received, the protocol type is changed into DLT645-07 protocol type, the 645 message is organized to reply, and the process is finished.

Specifically, as shown in fig. 2, in this embodiment, the collector includes a message data analysis module, a carrier communication module, a wireless communication module, and a 485 communication module. The collector may receive a power line message through the carrier interface circuit, where the power line message is a message sent by the upper layer terminal. Specifically, after an upper layer terminal, such as a concentrator or a power distribution terminal, is added with an equipment address file of a collector, the collector can communicate with the upper layer terminal according to a low-voltage power line broadband carrier communication protocol, and receive 645 protocol messages. In addition, the collector can also carry out wireless communication through a wireless module, the success rate and the reliability of the communication are greatly guaranteed and improved, after a 645 protocol message which accords with the protocol format is received, the message data analysis module of the collector extracts relevant serial port configuration information, register address information and Modbus messages and records the messages into a structure body, then serial port baud rate and check bits are configured according to the serial port configuration information, after the serial port configuration is completed, the Modbus messages are sent to an Internet of things device of the Modbus protocol through a 485 line, a timer is started so as to carry out overtime processing and serial port waiting receiving processing, after the messages are received by the serial port, frame analysis and check are carried out according to the Modbus protocol format, after the Modbus messages which accord with the protocol format are received, the protocol messages are organized according to the 645 protocol format and sent to a power line, and therefore the whole communication process is completed. Specifically, in this embodiment, the collector model may be a DCZL13-PLCM1667 type collector.

Example two

The second embodiment of the present invention provides a collector, which is configured to execute the power communication method according to the first embodiment, and specifically, an application program for executing the power communication method according to the first embodiment is integrated therein.

Specifically, in this embodiment, a message data parsing module, a carrier communication module, a wireless communication module, and a 485 communication module are disposed in the collector. The carrier communication module is used for communicating with an upper-layer terminal, the message data analysis module can analyze Modbus messages and serial port configuration information contained in 645 protocol messages sent by the upper-layer terminal, and then the Modbus messages are forwarded to relevant Modbus protocol equipment through the 485 communication module and the wireless communication module according to the serial port configuration information.

EXAMPLE III

As shown in fig. 3, a third embodiment of the present invention provides a Modbus protocol device communication system based on a collector, which includes Modbus protocol devices, an upper terminal, and the collector in the second embodiment.

In summary, the collector including the carrier communication module and the 485 communication module according to the invention extends the power line carrier communication protocol 645 protocol, so as to provide a communication external interface for the conventional internet of things device, thereby implementing the internet of things access function of the conventional Modbus protocol device. In view of the diversity and lack of unified standard of Modbus equipment, the method adopts a mode that communication parameters are from top to bottom and a message is read with configuration parameters, and baud rate and check bit information are added into a data field of a 645 protocol message, so that the universality of a program is improved.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A power communication method of Modbus protocol equipment based on a collector is characterized by being realized based on the collector and comprising the following steps of:

s1, expanding 645 protocol data, and containing serial port baud rate and check bit information of Modbus equipment in a data domain of a 645 protocol message according to protocol specification;

2. The power communication method of Modbus protocol devices based on a collector according to claim 1, wherein the collector comprises a message data parsing module, a carrier communication module, a wireless communication module and a 485 communication module.

3. The power communication method of Modbus protocol devices based on a collector according to claim 1, wherein the extended 645 protocol data format is as follows:

4. the power communication method of a collector-based Modbus protocol device according to claim 3, wherein in the extended 645 protocol, the field formats of the upstream frame and the downstream frame data are as follows:

5. the power communication method of the collector-based Modbus protocol device of claim 4, wherein in the data fields of the uplink frame and the downlink frame, the data bit format of the serial port control data is as follows:

6. the method for power communication of a collector-based Modbus protocol device according to claim 1, wherein the step S3 of sending the Modbus message to the Modbus protocol device further comprises the step of setting a timer.

7. The method for power communication of a collector-based Modbus protocol device according to claim 4, wherein in step S4, if no data is collected after timeout, the collector stops receiving Modbus messages and starts the next cycle.

8. The method according to claim 1, wherein in step S2, after receiving the 645 protocol packet sent by the upper terminal, the collector determines whether the packet is related to the Modbus, if so, performs parsing, and if not, performs processing according to a normal service flow.

9. A harvester for performing the method of any one of claims 1 to 8.

10. A Modbus protocol device communication system based on a collector, which is characterized by comprising Modbus protocol devices, an upper layer terminal and the collector of claim 9, wherein 645 protocol data of the upper layer terminal are expanded protocol data.