CN109560838B

CN109560838B - A bluetooth communication method for power metering field detection data

Info

Publication number: CN109560838B
Application number: CN201910042740.4A
Authority: CN
Inventors: 霍政界; 龚艺; 邱星; 谢伟
Original assignee: State Grid Corp of China SGCC; State Grid Jiangsu Electric Power Co Ltd; Changzhou Power Supply Co of State Grid Jiangsu Electric Power Co Ltd
Current assignee: Changzhou Changgong Electric Power Design Institute Co ltd; State Grid Corp of China SGCC; State Grid Jiangsu Electric Power Co Ltd; Changzhou Power Supply Co of State Grid Jiangsu Electric Power Co Ltd
Priority date: 2016-06-16
Filing date: 2016-06-16
Publication date: 2021-08-24
Anticipated expiration: 2036-06-16
Also published as: CN106100703B; CN106100703A; CN109560838A

Abstract

The invention provides a bluetooth communication method for on-site detection data of electric power measurement, which is implemented by a mobile operation terminal as a master station and an on-site detection device as a slave station; the on-site detection devices are all provided with address codes; Slave structure half-duplex communication mode exchanges data through information frames; the establishment and release of the communication link between the master station and the slave station are controlled by the information frame sent by the master station; the information frame consists of frame start character, slave station address field, Control code, data field length, data field, frame information vertical check code and frame terminator 7 fields; each field of the information frame is composed of bytes; the data transmission communication between the master station and the slave station is carried out according to the set protocol . The invention has concise and clear definition of collected data and communication protocol, convenient on-site implementation, can automatically, quickly and accurately obtain on-site detection data of electric power metering, strong applicability, good generality, and easy popularization.

Description

Bluetooth communication method for electric power metering field detection data

The invention is a divisional application of an invention patent application with the application number of 201610436443.4 and the application date of 2016, 6 and 16, and the name of the invention patent application is 'a power metering field detection data Bluetooth communication method'.

Technical Field

The invention relates to a Bluetooth communication method, in particular to a Bluetooth communication method for electric power metering field detection data.

Background

For a long time, the acquisition of the detection data of the metering site (electric energy meter) of the electric power department usually carries out the check detection on the metering site by a detector, then manually records the detection result on a notebook computer, and inputs the check result into a computer of a related system of the electric power department after returning to a unit.

In recent years, with the development of informatization of power enterprises, wireless communication technologies such as bluetooth are gradually applied to improve the working efficiency of power metering field detection and the accuracy of field detection data, and a mode generally adopted is that an inspector communicates with metering field detection equipment through a mobile operation terminal by adopting a certain bluetooth communication protocol, so that the mobile operation terminal automatically obtains the relevant detection data of the metering field detection equipment. However, at present, the bluetooth communication protocols for the field detection data of the power metering are various, the methods are different, the transmission data is complicated, a large amount of useless data which is not needed by a power department exists, the communication between the devices produced by different manufacturers can not be realized due to different protocols, and the field operation is inconvenient to implement; the redundant data is excessive, wasting communication resources and increasing cost.

Disclosure of Invention

The purpose of the invention is: the Bluetooth communication method for the electric power metering field detection data has the advantages of concise and clear definition of collected data and communication protocols, convenience in field implementation and capability of automatically, quickly and accurately obtaining the field detection data.

The technical scheme of the invention is as follows: the invention relates to a Bluetooth communication method for electric power metering field detection data, which is implemented by a mobile operation terminal with a Bluetooth communication function as a master station and field detection equipment with a Bluetooth communication function as a slave station; each field detection device is set with respective address code; a master station and a slave station adopt a master-slave structure half-duplex communication mode; the master station and the slave station exchange data through information frames in a point-to-point or one-master-multi-slave mode; the establishment and release of the communication link between the master station and the slave station are controlled by the information frame sent by the master station;

the information frame adopted by the communication between the master station and the slave station consists of 7 fields of a frame start symbol, a slave station address field, a control code, a data field length, a data field, a frame information longitudinal check code and a frame end symbol; wherein, the code of the frame start character is 68H; the code of the control code is C; the code of the data field length is L; the code of the DATA field is DATA; the code of the frame information longitudinal check code is CS; the code of the frame end is 16H;

each field of the information frame consists of bytes; each byte comprises 8-bit binary codes of D0-D7, and a start bit 0, an even parity bit P and a stop bit 1 which are added during transmission;

the control code C of the information frame comprises 8-bit binary codes of D0-D7, wherein D0-D4 are function codes, D0=11010, and the function is buffer memory; d1=11001, functioning as date and time of writing; d2=10010, functioning as a read secondary pressure drop; d3=10001, functioning to read electrical measurement data; d4=00000, function as reserved; d5 is a subsequent frame flag, D5=0, identifying no subsequent data frame, D5=1, identifying a subsequent data frame; d6 is slave station response identifier, D6=0 identifies the slave station correct response, D6=1 identifies the slave station abnormal response; d7 is a transmission direction identifier, D7=0 identifies a command frame issued by the master station, and D7=1 identifies a response frame issued by the slave station;

the data transmission communication between the master station and the slave station is carried out according to the following protocols:

first leading byte: before sending frame information, the master station sends 4 bytes of FEH to wake up the slave station as a receiver;

the transmission sequence is as follows: all data items transmit low-order bytes first and then transmit high-order bytes; each communication is started by the master station sending a request command frame to the slave station selected according to the address field of the information frame, and the requested slave station makes a corresponding response after receiving the command;

the response delay after the slave station receives the request command frame is Td: td is more than or equal to 20ms and less than or equal to 500 ms;

the pause time between bytes is Tb during transmission: tb is less than or equal to 500 ms;

error control: the byte check is even check, and the frame check is longitudinal information check sum; the receiver abandons the information frame and does not respond no matter the receiver detects even check error or longitudinal information check sum error;

communication rate: the master station and the slave station communicate according to the set current standard rate; when the communication rate needs to be changed, the master station sends a request for changing the communication rate to the slave station, and the slave station sends an acknowledgement frame or a negative acknowledgement frame to the master station; after the master station receives the confirmation frame of the slave station, the two parties carry out subsequent communication at the confirmed new standard rate, and the changed communication rate is kept unchanged after the communication is finished; alternative communication standard rates include 2400bps, 4800bps, 9600bps, 19200 bps;

the start of frame code 68H =01101000B of the information frame; end of frame 16H = 00010110B; data field length L =2 bytes; the DATA field DATA of the information frame comprises DATA identification, a password, an operator code, DATA and frame number information, and the sender performs 33H addition processing according to bytes during transmission and the receiver performs 33H subtraction processing according to bytes; the longitudinal check code CS of the information frame is the sum of the modulo 256 of all the bytes from the first frame start character to the front of the check code, and the overflow value exceeding 256 is not counted;

when the master station needs to read the electrical measurement data of the slave station, the master station sends a request command information frame of a control code C =11H and a data field length L =01H to the slave station; the slave station transmits a normal response frame of data consisting of a control code C =91H, a data field length L = m +1 and data bits N0 to Nm to the master station, wherein m is a natural number from 1 to 359; or the slave station sends an abnormal response frame which contains the control code C = D1H, the data field length L =01H and the error code ERR to the master station;

when the master station needs to read the secondary voltage drop data of the slave station, the master station sends a request command information frame of a control code C =12H and a data field length L =01H to the slave station; the slave station transmits a normal response frame of data consisting of a control code C =92H, a data field length L = m +1 and data bits N0 to Nm to the master station, wherein m is a natural number from 1 to 359; or the slave station transmits an abnormal response frame to the master station, the abnormal response frame including the control code C = D2H, the data field length L =01H, and the error code ERR.

The invention has the positive effects that: the Bluetooth communication method for the electric power metering field detection data is implemented by a mobile operation terminal with a Bluetooth communication function and electric power metering field detection equipment, the design of a Bluetooth communication protocol between the mobile operation terminal and the field detection equipment is established on the basis of a large amount of practical experience of electric power metering field detection work, the protocol definition is concise and clear, data of communication exchange is refined without redundant data, the applicability is strong, the universality is good, and the popularization is convenient; the method is convenient to access and implement on site, can automatically, quickly and accurately obtain detection data such as electric energy meter site calibration data, secondary voltage drop test data, secondary load test data and the like on an electric power metering site, saves time and labor, and can effectively improve the informatization level of the metering site detection work of an electric power department.

Drawings

FIG. 1 is a diagram illustrating the relative field codes of an information frame used in the present invention;

FIG. 2 is a diagram illustrating the byte format of an information frame used in the present invention during communication transmission;

FIG. 3 is an illustration of the format of control codes in an information frame used in the present invention;

FIG. 4 is a diagram illustrating the format of the domain associated with the request frame of the master station when the electrical measurement data is read according to the present invention;

FIG. 5 is a diagram illustrating the format of the relevant fields of the normal response frame of the slave station when reading the electrical measurement data according to the present invention;

FIG. 6 is a diagram illustrating the format of the fields associated with the abnormal response frames from a station during the reading of electrical measurement data in accordance with the present invention;

FIG. 7 is a diagram illustrating the format of the domain associated with the request frame of the primary station when reading the secondary pressure drop data according to the present invention;

FIG. 8 is a diagram illustrating the format of the relevant fields of the normal response frame from the slave station when reading the secondary pressure drop data according to the present invention;

fig. 9 is a diagram illustrating the format of the relevant fields of the abnormal response frame from the station when reading the secondary pressure drop data according to the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

(example 1)

The bluetooth communication method for the power metering field detection data of the embodiment is implemented by a mobile operation terminal (mobile terminal for short) with a bluetooth communication function and a power metering device field detection device (field detection device for short) with a bluetooth communication function, which are controlled by inspection personnel; the field detection equipment mainly comprises an electric energy meter field check device, a secondary voltage drop test device and a secondary load test device, and each field detection equipment is set with a respective address code; the mobile terminal is a master station, and the field detection equipment is a slave station; a half-duplex communication mode adopting a master-slave structure; the master station and the slave station exchange data through information frames in a point-to-point or one-master-multi-slave mode. The establishment and release of the communication link between the master station and the slave station are controlled by the information frame sent by the master station.

Referring to fig. 1, an information frame is a basic unit for transmitting information, and the information frame used for communication between a master station and a slave station is composed of 7 fields, namely a frame start symbol, a slave station address field, a control code, a data field length, a data field, a frame information longitudinal check code and a frame end symbol; wherein, the code of the frame start character is 68H; the code of the control code is C; the code of the data field length is L; the code of the DATA field is DATA; the code of the frame information longitudinal check code is CS; the end of frame code is 16H.

Referring to fig. 2, each field of the information frame is composed of a plurality of bytes, each byte contains 8 bits of binary code including D0-D7, and 11 bits of start bit 0, even parity bit P and stop bit 1 are added during transmission.

The start of frame code 68H of the information frame, which identifies the start of a frame of information, has a value of 68H = 01101000B.

The format of the control code C of the information frame is shown in fig. 3, and the control code C includes 8-bit binary codes from D0 to D7, where D0 to D4 are function codes, D0=11010, and function is clear buffer; d1=11001, functioning as date and time of writing; d2=10010, functioning as a read secondary pressure drop; d3=10001, functioning to read electrical measurement data; d4=00000, function as reserved; d5 is a subsequent frame flag, D5=0, identifying no subsequent data frame, D5=1, identifying a subsequent data frame; d6 is slave station response identifier, D6=0 identifies the slave station correct response, D6=1 identifies the slave station abnormal response; d7 denotes a transmission direction flag, D7=0 denotes a command frame issued by the master station, and D7=1 denotes a response frame issued by the slave station.

The data field length L of the information frame is the number of bytes in the data field, and L =2 bytes.

The DATA field DATA of the information frame, including DATA identification, password, operator code, DATA, frame number information, its structure changes with the function of the control code; during transmission, the sender performs 33H addition processing according to bytes, and the receiver performs 33H subtraction processing according to bytes.

The check code CS of the information frame, starting from the first frame start to the modulo 256 sum of all bytes preceding the check code, i.e. the binary arithmetic sum of the bytes, disregards overflow values exceeding 256.

The end of frame 16H of the information frame, which identifies the end of a frame of information, has a value of 16H = 00010110B.

communication rate: the master station and the slave station communicate according to the set current standard rate; when the communication rate needs to be changed, the master station sends a request for changing the communication rate to the slave station, and the slave station sends an acknowledgement frame or a non-acknowledgement frame to the master station; after the master station receives the confirmation frame of the slave station, the two parties carry out subsequent communication at the confirmed new standard rate, and the changed communication rate is kept unchanged after the communication is finished;

the selectable communication standard rates adopted by the embodiment are as follows: 2400bps, 4800bps, 9600bps, 19200 bps.

Referring to fig. 4 to 6, when the master station needs to read the electrical measurement data of the slave station, the master station sends a request command information frame of control code C =11H and data field length L =01H to the slave station (as shown in fig. 4); the slave station transmits a normal response frame (as shown in fig. 5) of control code C =91H, data field length L = m +1, data consisting of data bits N0 to Nm (where m is a natural number of 1 to 359); or, the slave station transmits an abnormal response frame (as shown in fig. 6) including the control code C = D1H, the data field length L =01H, and the error code ERR to the master station; and the master station sends a command frame to the slave station, the slave station returns a normal or abnormal response frame, the communication is finished, and the master station performs subsequent processing according to the received response frame of the slave station and the set service logic.

Referring to fig. 7 to 9, when the master station needs to read the secondary voltage drop or the secondary load data of the slave station, the master station sends a request command information frame (as shown in fig. 7) with a control code C =12H and a data field length L =01H to the slave station, where N0=0 for standby; n0=1 is defined as the voltage transformer secondary circuit voltage drop; NO =2 is defined as the voltage transformer secondary circuit load; NO =3 defines the current transformer secondary circuit load;

the slave station transmits to the master station a normal response frame of control code C =92H, data field length L = m +1, data consisting of data bits N0 to Nm (where m is a natural number from 1 to 359) (as shown in fig. 8); or, the slave station transmits an abnormal response frame (as shown in fig. 9) including the control code C = D2H, the data field length L =01H, and the error code ERR to the master station; and when the communication between the master station and the slave station is finished, the master station performs subsequent processing according to the set service logic according to the received slave station response frame.

The above embodiments are illustrative of specific embodiments of the present invention, and are not restrictive of the present invention, and those skilled in the relevant art can make various changes and modifications without departing from the spirit and scope of the present invention to obtain corresponding equivalent technical solutions, and therefore all equivalent technical solutions should be included in the scope of the present invention.

Claims

1. A power metering on-site detection data Bluetooth communication method is implemented by a mobile operation terminal with a Bluetooth communication function as a master station and on-site detection equipment with a Bluetooth communication function as a slave station; each field detection device is set with respective address code; the method is characterized in that: a master station and a slave station adopt a master-slave structure half-duplex communication mode; the master station and the slave station exchange data through information frames in a point-to-point or one-master-multi-slave mode; the establishment and release of the communication link between the master station and the slave station are controlled by the information frame sent by the master station;