本文選題：嵌入式系統(tǒng) + Modem��； 參考：《南京郵電大學(xué)》2013年碩士論文

【摘要】：隨著嵌入式系統(tǒng)的持續(xù)發(fā)展，設(shè)備的聯(lián)網(wǎng)、遠(yuǎn)程監(jiān)控、數(shù)據(jù)傳輸?shù)葐栴}急需解決。目前有兩種解決方案，一是設(shè)備通過以太網(wǎng)（RJ45）直接接入互聯(lián)網(wǎng)，二是通過串口（RS232）連接嵌入式Modem接入互聯(lián)網(wǎng)。 本文介紹了Modem的發(fā)展與現(xiàn)狀，敘述了嵌入式系統(tǒng)的發(fā)展與特點(diǎn)，給出了嵌入式Modem的定義。提出了一種基于CMX469A的嵌入式Modem，是為南昌路通高新技術(shù)有限責(zé)任公司提供的數(shù)據(jù)傳輸方案。 本設(shè)計(jì)主要用于采集模塊與工作站的服務(wù)器通過架設(shè)在鐵路沿線的傳輸線進(jìn)行通信�；谇度胧较到y(tǒng)51單片機(jī)平臺，采用CMX469A調(diào)制解調(diào)芯片實(shí)現(xiàn)4800bps全雙工調(diào)制解調(diào)器的方案，進(jìn)行調(diào)制解調(diào)技術(shù)的研究。對于只有一個(gè)串行口的51系列單片機(jī)來說，由于CMX469A不占用串行口，因此，，單片機(jī)可以利用串行口方便地與計(jì)算機(jī)或者其它設(shè)備進(jìn)行串口通信，從而為整個(gè)系統(tǒng)的設(shè)計(jì)提供方便。 本設(shè)計(jì)的嵌入式Modem具有以下優(yōu)點(diǎn)： （1）體積小。由于嵌入式Modem主要構(gòu)成部分為單片機(jī)和調(diào)制解調(diào)芯片，組成外圍電路的元器件也多為貼片式封裝，因此，整體體積控制在很小的范圍內(nèi)，非常節(jié)省空間。 （2）外圍電路簡單。組成嵌入式Modem的功能模塊已經(jīng)被集成在一塊芯片中，外圍電路只是一些必要的穩(wěn)壓、濾波、整流等簡單的功能，通過簡單的電路就能實(shí)現(xiàn)其功能。 此外，利用CMX469A實(shí)現(xiàn)的調(diào)制解調(diào)器具有抗干擾能力強(qiáng)、電路簡單、程序設(shè)計(jì)方便等優(yōu)點(diǎn)，還具有易安裝、易維護(hù)、成本低廉等優(yōu)勢。 論文結(jié)尾部分，對本設(shè)計(jì)進(jìn)行了總結(jié)與展望。
[Abstract]:With the continuous development of embedded system, the problems of equipment networking, remote monitoring and data transmission need to be solved. At present, there are two solutions, one is that the device directly connects to the Internet via Ethernet (RJ45), the other is connected with embedded Modem through serial port (RS232) to access the Internet. This paper introduces the development and present situation of Modem, describes the development and characteristics of embedded system, and gives the definition of embedded Modem. This paper presents an embedded Modemm based on CMX469A, which is a data transmission scheme for Nanchang Lutong High-Tech Co., Ltd. This design is mainly used for communication between the acquisition module and the server of the workstation through the transmission line along the railway. Based on the embedded system 51 single chip computer, the scheme of 4800bps full duplex modem is realized by using CMX469A modulation and demodulation chip, and the technology of modulation and demodulation is studied. For 51 series single-chip microcomputer with only one serial port, because CMX469A does not occupy serial port, the serial port can be used to communicate with computer or other equipment conveniently, thus providing convenience for the design of the whole system. The embedded Modem designed in this paper has the following advantages: Small size. Because the main components of embedded Modem are single chip microcomputer and modulation and demodulation chip, and the components of peripheral circuit are mostly chip packaging, therefore, the whole volume is controlled in a very small range, and the space is saved very much. The peripheral circuit is simple. The function module of embedded Modem has been integrated into one chip. The peripheral circuit is only some simple functions such as voltage stabilizer, filter, rectifier and so on, which can be realized by simple circuit. In addition, the modem realized by CMX469A has the advantages of strong anti-interference ability, simple circuit, convenient program design, easy installation, easy maintenance and low cost. At the end of the paper, the design is summarized and prospected.
【學(xué)位授予單位】：南京郵電大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TP368.1;TN915.05

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本文編號：1970196