CN102591687A - Application system of switching and metering protocol for meter reading terminal and method - Google Patents

Abstract

The invention discloses an application system of a switching and metering protocol for a meter reading terminal and a method. The system comprises the meter reading terminal; the meter reading terminal comprises an acquisition unit, a data processing unit and a boot loading unit. The method comprises the steps of: firstly acquiring protocol data, then judging whether a matching protocol analysis program for analyzing the protocol data exists, if not, transmitting an updating signal, downloading and updating an ELF (executable linkable format) file so as to start the matching protocol analysis program, and transmitting a starting signal, if so, starting the matching protocol analysis program, and transmitting the starting signal, finally, realizing a dynamic linking mode by utilizing an ELF file mode according to the received starting signal, and loading the matching protocol analysis program. According to the application system and the method disclosed by the invention, the flexibility is strong; the upgrade is simple; the time, the labour and the cost are saved, and a space space used for storing a program by an internal memory also can be saved. The application system and the method are widely applied to the industrial field.

Description

Application system and method for meter reading terminal switching meter protocol

technical field

The invention relates to an application system and method for program updating, in particular to an application system and method for meter reading terminals to switch meter protocols.

Background technique

With the improvement of information management level and the rapid development of data transmission, the meter reading methods of my country's power supply system, water supply system, heating system and gas supply system have undergone great changes, from the previous manual meter reading to the use of Hand-held meter reading devices have even gradually developed into a fully automated intelligent remote meter reading system. However, in this development process, due to regional differences and differences in meter usage, various meter reading instruments have concluded various meter reading agreements and regulations. At the same time, the manufacturers of each meter instrument will also customize their own protocols. statutes, and will also produce new statutes to improve existing statutes, so there are various different statutes in metering instruments.

Because the meter reading device cannot fully meet various meter protocols and new meter protocols in the future, usually, the meter reading device only supports the meter protocol that needs to be used currently and the meter protocol that is frequently used. Therefore, when it is required When using a protocol that is not supported by the current meter reading device, the meter reading device should be upgraded. When the current meter reading equipment upgrades the program and replaces the protocol, it does not just add or delete one or several meter protocols, but updates all the meter protocols in the program together, or even updates the entire program. Moreover, as the number of protocols supported by the meter reading device increases, the upgrade file becomes larger, and the corresponding upgrade time is relatively prolonged. In addition, due to different site conditions, metering instruments are different. If a unified program is used, it cannot be well adapted to site conditions. Moreover, since one program supports multiple protocols, including protocols that are not used on site, program storage will be wasted Space. the

Contents of the invention

In order to solve the above-mentioned existing technical problems, the object of the present invention is to provide an application system for meter reading terminal switching meter protocols with high efficiency updating and saving memory storage space.

Another object of the present invention is to provide an application method of meter reading terminal switching meter protocols with high efficiency updating and saving memory storage space.

The technical solution adopted by the present invention is: an application system for meter reading terminals to switch meter protocols, the system includes a meter reading terminal, and the meter reading terminal includes:

an acquisition unit, configured to acquire specification data;

The data processing unit is used to judge whether there is a matching protocol analysis program for parsing the protocol data, if not, send an update signal, download and update the ELF file, and then send a start signal; if so, send a start signal;

The startup loading unit is used to receive the startup signal, start the matching protocol analysis program according to the received startup signal, and load the matching protocol analysis program by using the ELF file to realize the dynamic link.

Further, the same name is set for the virtual function interface of the ELF file.

Another technical solution adopted by the present invention is: an application method for meter reading terminal switching meter protocol, the method steps comprising:

A. Obtain protocol data;

B, judge whether there is a matching protocol analysis program for parsing the protocol data, if not, send an update signal, carry out ELF file download update, then send a start signal; if so, send a start signal;

C. Receive the start signal, start the matching protocol analysis program according to the received start signal, and load the matching protocol analysis program by using the ELF file to realize dynamic linking.

Further, in the step C, the ELF file is used to realize the dynamic link, and the matching protocol analysis program is loaded, specifically, firstly, the ELF file is relocated to the function and the variable, and then according to the position of the relocated function and the variable Perform dynamic linking and load the relocated matching protocol parser.

Further, the same name is set for the virtual function interface of the ELF file.

The beneficial effects of the present invention are: the application system of the present invention has strong flexibility, and can effectively and directly target a certain type of meter equipment on site, and because only the ELF file needs to be updated when the meter reading terminal is upgraded, the upgrade is simple, time-saving and labor-saving Cost saving. In addition, the ELF file is used to realize dynamic linking to load the program, which can save the memory space for storing the program.

Another beneficial effect of the present invention is: the application method of the present invention has strong flexibility and can effectively directly target a certain type of meter equipment on site, and because only the ELF file needs to be updated when the meter reading terminal is upgraded, the upgrade is simple and saves time. It saves time, labor and cost. In addition, the program is loaded by using ELF files to realize dynamic linking, which can save the memory space for storing programs.

Description of drawings

The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing:

Fig. 1 is the system block diagram of the application system of a kind of meter reading terminal switching meter agreement of the present invention;

Fig. 2 is a flow chart of steps of an application method of meter reading terminal switching meter protocol in the present invention.

Detailed ways

As shown in Figure 1, an application system for meter reading terminals to switch meter protocols, the system includes a meter reading terminal, and the meter reading terminal includes:

an acquisition unit, configured to acquire specification data;

The data processing unit is used to judge whether there is a matching protocol analysis program for parsing the protocol data, if not, send an update signal, download and update the ELF file, and then send a start signal; if so, send a start signal;

The startup loading unit is used to receive the startup signal, start the matching protocol analysis program according to the received startup signal, and load the matching protocol analysis program by using the ELF file to realize the dynamic link.

Further as a preferred implementation manner, the virtual function interface of the ELF file is set with the same name. The ELF file is stored in the hard disk.

As shown in Fig. 2, a kind of application method of meter reading terminal switching meter protocol, the method steps include:

A. Obtain protocol data;

B, judge whether there is a matching protocol analysis program for parsing the protocol data, if not, send an update signal, carry out ELF file download update, then send a start signal; if so, send a start signal;

C. Receive the start signal, start the matching protocol analysis program according to the received start signal, and load the matching protocol analysis program by using the ELF file to realize dynamic linking.

Further as a preferred embodiment, in the step C, the ELF file mode is adopted to realize dynamic linking, and the matching protocol parsing program is loaded, specifically, at first the ELF file is carried out to function and variable relocation, and then according to the relocated Dynamically link the positions of functions and variables and load the relocated matching protocol parser.

Further as a preferred implementation manner, the virtual function interface of the ELF file is set with the same name. The ELF file is stored in the hard disk.

The ELF file loading process is as follows:

(1) The kernel first reads the header of the ELF file, and then reads various data structures. From these data structures, the address and identification of each segment or section can be known, and then find the loadable content of the matching protocol parser and load it into in memory. At the same time, the segment flag is read to identify whether the segment is readable, writable, or executable in memory. Wherein, the text segment is program code, which is read-only and executable, and the data segment is readable and writable.

(2) Find the corresponding dynamic linker name from the PT_INTERP segment, and load the dynamic linker. Usually /lib/ld-linux.so.2.

(3) The kernel sets some flag pairs in the stack of the new process to indicate the relevant operations of the dynamic linker.

(4) The kernel passes control to the dynamic linker.

(5) The dynamic linker checks the program's dependencies on the shared library and loads it.

(6) The program starts to execute.

The above is a specific description of the preferred implementation of the present invention, but the invention is not limited to the described embodiments, and those skilled in the art can also make various equivalent deformations or replacements without violating the spirit of the present invention. , these equivalent modifications or replacements are all within the scope defined by the claims of the present application.

Claims (5)

1. An application system for meter reading terminal switching meter protocol, the system includes a meter reading terminal, characterized in that: the meter reading terminal includes: an acquisition unit, configured to acquire specification data; The data processing unit is used to judge whether there is a matching protocol analysis program for parsing the protocol data, if not, send an update signal, download and update the ELF file, and then send a start signal; if so, send a start signal; The startup loading unit is used to receive the startup signal, start the matching protocol analysis program according to the received startup signal, and load the matching protocol analysis program by using the ELF file to realize the dynamic link. 2. According to claim 1, a kind of application system for meter reading terminal switching meter protocol is characterized in that: the virtual function interface of said ELF file is set with the same name. 3. An application method for meter reading terminal switching meter protocol, characterized in that: the method steps include: A. Obtain protocol data; B, judge whether there is a matching protocol analysis program for parsing the protocol data, if not, send an update signal, carry out ELF file download update, then send a start signal; if so, send a start signal; C. Receive the start signal, start the matching protocol analysis program according to the received start signal, and load the matching protocol analysis program by using the ELF file to realize dynamic linking. 4. according to the described application method of a kind of meter reading terminal switching meter agreement of claim 3, it is characterized in that: adopt the mode of ELF file mode to realize dynamic link in the described step C, the matching agreement analysis program is loaded, specifically , first perform function and variable relocation on the ELF file, and then perform dynamic linking according to the positions of the relocated functions and variables and load the relocated matching protocol analysis program. 5. According to claim 3, the application method of meter reading terminal switching meter protocol is characterized in that: the virtual function interface of the ELF file is set with the same name.

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