基于电话网络的远程数据通讯  

Remote Data Communication Based on Telephone Network

作　　者：阎欣 

机构地区：[1]辽宁电力实业有限公司,辽宁沈阳110006

出　　处：《自动化信息》2007年第6期38-39,共2页Automation Information

摘　　要：本文介绍了一种简单的基于编码芯片PCD3312的单片机远程通讯方法。采用电话线作为传输线路，PCD3312作为信号调制器，设计出了一种低成本的数据通讯工具。 本系统采用串行通讯方式。数据发送端首先以拨号方式将接收端的号码通过PCD3312调制成不同频率的正弦信号，经由电话线发送至电话交换机，然后电话交换机根据发送来的号码，向接收端发送请求，接收端根据请求发出应答信号，发送端收到应答信号后即开始传送数据。接收端是通过一个复杂的信号解调电路将不同频率的正弦信号解调成可以被系统利用的数字信号。这就是本系统的数据通信过程。The thesis introduces a simple method of remote communication based on the coding chip PCD3312. A low-cost tool of digital communication is designed by using telephone line as the transmission circuit and the PCD3312 as the signal modulator. The system adopts the serial communication mode. The communication process of the system is achieved as follows： firstly, the data transmit end modulates, through PCD3312 and by dialing the telephone number, the number of the receiving end to sine signals of different frequencies which is transmitted to the telephone switchboard through telephone line; second, according to the number of the receiving end, the telephone switchboard sends an asker signal to the receiving end and in turn the receiving end sends out the response signal to the transmit end when it receives the asker signal, the data transmit end starts to send data when it receives response signal. The receiving end, through a complicated signal demodulation circuit, demodulates the sine signal of different frequencies to digital signal which can be used by the system.

关 键 词：远程通讯 拨号 调制解调 单片机 编码芯片 PCD3312 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]