1. Hardware design analysis of wireless data transmission terminal based on GPRS
From the perspective of wireless data transmission terminal hardware design, with support, the microcontroller serial port can complete the connection with the communication module. In this process, it can not only complete the data initialization and sending and receiving processing, but also realize the communication with the scalable serial port. Data exchange operations for other embedded operating system machines.The corresponding hardware framework structure diagram is shown in the figure below
2. The entire wireless data transmission terminal software
The core of the design lies in efficient communication between the module and the microcontroller device. In order to achieve an efficient communication connection between the two, the corresponding communication protocol must be defined during the software design process, and the corresponding frame format must be specified on this basis. It is particularly noteworthy that related work including network attachment, Internet network access, activation and data transmission should be implemented with the help of instructions. Specifically, the software design of wireless data transmission terminal based on wireless data transmission should focus on the following aspects. One-instruction debugging design analysis In the entire wireless data transmission terminal software system, the action of the microcontroller device sending instructions to the module is recommended based on a certain protocol. After receiving the instruction, the receiving module can generate a corresponding return value and perform Verification processing job.From this point of view, the microcontroller serial port is actually aimed at the completion of unit transceiver operations, with the communication protocol predefined as the start bit, check bit and stop bit, and determines the corresponding bits in the process. The special encapsulation form of data frame number, its design should focus on these aspects.
① First of all, the command baud rate should be set with the help of the built-in super terminal operating platform, and the baud rate of the communication module used by the wireless data transmission terminal should be set using the baud rate of 20 bauds. The clever pin method prevents the transmission terminal from being lost after power failure.
② Secondly, the process of the module replying to the received character handshake signal is called the echo process. The function of the handshake mechanism can ensure the effectiveness of module instruction sending and receiving operations. However, considering that the handshake signal is filtered out by the program control during the character verification process, the reliability of the program will inevitably be significantly reduced during the process of switching serial port interrupts too frequently. Considering the above factors, instructions should be taken during the terminal design process to shield the module echo actions. 2. Program Design Analysis The entire wireless data transmission terminal system program design is based on the standard mode for writing operations. Based on this standard mode, it includes four aspects: system initialization module, connection establishment module, data transmission module and disconnection module. Among them, the working mode of the initialization module is directly defined as the serial port of the model microcontroller, and the automatic reload timer device is set as its corresponding timer. At the same time, the connection module is established to enhance the readability and intuitiveness of the program. The required commands are stored in the command cache area and the commands are stored in the form of strings. The corresponding programming process.
3. Заключение
With the support of current technical conditions, general packet wireless services have become one of the comprehensive application technologies that have attracted much attention in the practice of remote data transmission and telemetry and remote control. At the same time, as wireless communication technology moves to a new stage of development, the wireless network provided by mobile operators to achieve data transmission and remote supervision and control has been deeply used in various industries. In summary, this article briefly analyzes and explains the issues related to the design of wireless data transmission terminals, hoping to provide certain reference and help for future related research and practical work.
Keywords: data transmission terminal