一種無線數(shù)據(jù)采集和傳輸系統(tǒng)的設(shè)計(jì)-外文翻譯-其他專業(yè)(參考版)
2025-01-23 00:29本頁面
【正文】 the other function is treating and transmitting the data got from interface, such as router processing, data packaging, verification and repeating request. Module’s key MCU is 51 series microprocessor, and considering the industrial function, the WINBOND was applied in this practical experiment because of it’s good capability in 8bit CMOS microprocessor, patibility with wide voltage electric supply, 256Bytes embedded RAM, 16KB Flash EPROM and 64KB addressing space, four 8 Bit standard I/O interfaces, one standard I/O dual serial interface. The Crystal Oscillator frequency of SCM is , and the electric power is to adapting to nRF905 logical level in wireless transceiver chip. The impending PIN was protected by connecting with VCC to keeping its stability. The specific connection between MCU and all modules is described in TABLAE 1. C. Multifunctional Electric Power Management Module The most remarkable characteristic is patibility with 824V wide voltage electric supply including CMOS power and TTL power, respectively in 5V and , which provided all modules with the suitable and stable power. Meanwhile,it means so much in energy source saving because of its electronic switch. The power supply transfer chip C851414 and is the primary ingredient in this C851414 made the electric voltage transfer from 8V to 24V, then, the made it from 5V to . Furthermore,suitable filter capacitance and inductance was introduced to make power’s ripple characteristic perfect as possible. D. Universal Serial Interface Module The main function of Universal Serial interface module is connecting universal terminal equipment, such as signal output equipment or analog collection equipment with AD transfer. At the same time, it provides entrance to the puter terminal data exchange through universal RS232 serial interface. E. Data Buffer and Storage Module It has two kinds of function, one is data buffer, the other is data storage, respectively 8 performed by 32KByte RAM and 16KByte EEPROM. Data buffer district supervise buffering some temporary data, such as transmit data, waiting data. Data storage district supervise some fixed data memory, such as router data, local host, local address and some renewed data for poweroff protective. F. High Frequency Shielding Protecting Moudule In order to prevent electromagic interference from environment, circuit in our designing system is protected with metal enclosure. At the same time, preventing the digital circuit interfere from the radio frequency circuit in the system, we placed the two circuits in different isolated bin, such as figure 3. There is a small hole with diameter less than 1/4 wavelength in the metal box side, which is either easy to pass the line or prevent the electromagic wave from getting in it. Ⅳ .SYSTEM SOFTWARE DESIGN The realization of system performance depends on its effective and reasonable software control. The design of this software is on the basis of the hardware environment to development a wireless work protocol that have functions as data transmission, avoiding conflict, the retransmission when error occurs, and overtime retry, in order to achieve the design goal. The entire work is posed of a host and many scattered terminals, each terminal must have a wireless transceiver node (this system adopts nRF905 singlechip RF transceiver), any nodes of the entire wireless work has a unique identified address which is posed of an unique identified terminal. For convenience’s sake, each terminal wirele
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鄂ICP備17016276號-1