基于CMX469A的嵌入式Modem传输系统

发布时间：2018-06-02 21:08

本文选题：嵌入式系统 + Modem　；参考：《南京邮电大学》2013年硕士论文

【摘要】：随着嵌入式系统的持续发展，设备的联网、远程监控、数据传输等问题急需解决。目前有两种解决方案，一是设备通过以太网（RJ45）直接接入互联网，二是通过串口（RS232）连接嵌入式Modem接入互联网。本文介绍了Modem的发展与现状，叙述了嵌入式系统的发展与特点，给出了嵌入式Modem的定义。提出了一种基于CMX469A的嵌入式Modem，是为南昌路通高新技术有限责任公司提供的数据传输方案。本设计主要用于采集模块与工作站的服务器通过架设在铁路沿线的传输线进行通信。基于嵌入式系统51单片机平台，采用CMX469A调制解调芯片实现4800bps全双工调制解调器的方案，进行调制解调技术的研究。对于只有一个串行口的51系列单片机来说，由于CMX469A不占用串行口，因此，，单片机可以利用串行口方便地与计算机或者其它设备进行串口通信，从而为整个系统的设计提供方便。本设计的嵌入式Modem具有以下优点：（1）体积小。由于嵌入式Modem主要构成部分为单片机和调制解调芯片，组成外围电路的元器件也多为贴片式封装，因此，整体体积控制在很小的范围内，非常节省空间。（2）外围电路简单。组成嵌入式Modem的功能模块已经被集成在一块芯片中，外围电路只是一些必要的稳压、滤波、整流等简单的功能，通过简单的电路就能实现其功能。此外，利用CMX469A实现的调制解调器具有抗干扰能力强、电路简单、程序设计方便等优点，还具有易安装、易维护、成本低廉等优势。论文结尾部分，对本设计进行了总结与展望。
[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.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TP368.1;TN915.05

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