In recent years, the State Grid Corporation has vigorously explored the rural power market. The launch of a new round of rural network transformation and upgrading work and the complete cancellation of revenues have created a wide application space for portable mobile toll terminal equipment. The relevant person in charge of the National Development and Reform Commission said that up to now, 29 provinces (autonomous regions and municipalities) except Tibet and Xinjiang have held hearings for residents' electricity prices. The local pricing authorities have carefully studied the opinions and suggestions put forward by the participants of the hearing, and further revised and improved the implementation plan based on this, and introduced them in mid-June 2012, starting from July 1st and starting a comprehensive trial in the country. Resident ladder electricity price reform program. The formulation of the new electricity tariff calculation method is bound to put forward new functional requirements for the power mobile charging terminal. That is, the software system or resource file of the power mobile charging terminal should be updated in time to improve the terminal performance and meet the service requirements of the charging system.
Embedded systems have become the first choice for the stability and reliability of power mobile toll terminal systems. At present, there are two ways to update the embedded device software: one is to use the PC locally, download the software to the device through the serial port (or network port), and complete the software system upgrade; the other is to use the network for online upgrade. The former method can only perform software upgrade operations locally, which is inconvenient for batch update, and is more suitable for laboratory debugging and small-volume production of devices. The latter method can be used for batch upgrade of online terminals through the network. However, in fact, many terminal devices do not have an integrated online upgrade function, that is, the function upgrade of the terminal is impossible. Therefore, efforts have been made to find a way to upgrade the terminal function in some way without any change to the terminal, making it impossible.
1 Strategy design
Information consists of a number of bytes, one or more bytes forming an information unit, defining a name that expresses the meaning of the determination. In order to ensure that the information can be transmitted correctly between the platform and the terminal, the information can be organized according to a certain structure in a predetermined manner. Table 1 and Table 2 give the structure of the information.
The composition of the information can also be a simple, universal hypertext markup language, such as HTML language, XML language and so on. HTML text is descriptive text composed of HTML commands, which can describe text, graphics, animations, sounds, tables, links, and more. HTML document production is not very complicated, and powerful, supporting file embedding in different data formats.
Use the format described in Table 1 or Table 2 to organize the information format. If the terminal does not have the online upgrade function, then the terminal that has been sold to the customer to use the function upgrade can only send the terminal back to the manufacturer, or find the factory staff to the customer. Use the PC to download the software to the terminal through the serial port (or network port). If the B/S architecture is used to design the terminal and platform, and GPRS is used for data interaction, data transmission will be a thorny problem (can not be considered when using wired mode) [1]. Taking all of the above factors into consideration, a strategy for completing the terminal function upgrade without any modification to the terminal firmware is proposed. In the implementation process, the design idea of ​​thin client and B/S architecture is integrated, that is, the HTML language is added on the basis of the traditional communication protocol, so that the terminal can be adapted to the new one with little or no increase in data traffic. Business needs.
2 Implementation
The data interaction in the distributed power mobile charging system is carried out by means of terminal request and platform response. Adding an HTML or XML communication protocol based on the YD/T 1363.3-2005 fixed communication protocol, ie, the HTML or XML part is one or several fields in the fixed communication protocol INFO. The data field in HTML or XML format is sent on the sending end; the data is verified and parsed in the format of the fixed protocol at the receiving end [2], and the independent data fields parsed are the HTML or XML standard language. In order to adapt to the changes in system development requirements, the system construction has good independence, standardization, compatibility, flexibility, openness and scalability. The specific inclusion relationship is shown in Figure 1.
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