基于ST7540的多频率电力线通信系统设计

文档编号:CK035   文档字数:13600,页数:53

摘  要

 这篇文档针对的是低压电力线载波抄表系统中的载波通信模块的设计制作。模块以STC12C5A32S2单片机为核心，包括显示模块,RS232通信模块，调制解调芯片ST7540的发送，接收模块以及滤波耦合模块和按键模块，电源模块组成。首先单片机接收由计算机发送的数据，再通过调制解调芯片ST7540将从单片机接收到的数据进行调制，在把调制后的载波信号通过磁环耦合到电力线上。接收模块将电力线上的载波信号进行解调，再把数据传输给单片机，单片机通过LCD显示接收到的数据，从而实现电力线载波数据的收发。
 
关键词: 电力线载波,单片机,ST7540,LCD,调制解调

Abstract

 This paper is a design of carrier communication module ,aiming at low-voltage power line carrier.
the core of the module is Microcontroller to STC12C5A32S2,include display module, RS232 connector circuit, modem chip ST7540 sending, receiving module, filter coupled module,button module,power supply module and so on . first Microcontroller  receive data  by the computer ,then Through the modem chip ST7540 , the data received from the Single -Chip Computer will be used to modulate. Then put the signal which from the modulated carrier coupl to the power line through the magnetic .Receiver module demodules signal which is from the power line carrier ,then transmit the data to the Single -Chip Computer. Single -Chip Computer show the data through the LCD display , to finish the transceiver of the power line carrier.
 
Keywords：Power Line Carrier,Single-chip Microcomputer,St7540, Lcd;Moden
 
目 录
摘要………………………………………………………………………………………………I
1 前言……………………………………………………………………..……………………..1
2 总体设计方案………………………………………………………….………………….....2
2.1  系统总体结构…………………………………………………….……………….……2
2.2   系统硬件结构………………………………………………………………………………..3
2.3   系统总体软件流程…………………………………………………………………………..4
3  电力线载波通信发送、接收模块…………………………………..……...………………..5
 3.1  STC12C5AS32单片机介绍………………………………………………..…………… 5
  3.2  ST7540调制解调芯片介绍………………………………….……………….………………7
  3.3 电力线载波通信发送模块………………………………………………..……...…………..12
      3.4  电力线载波通信接收模块……………………………………………………….....………14
      3.5  发送、接收模块总硬件电路图……………………………………………………………..18
 3.6  电力线载波通信耦合电路设计………………………………………………….....………18
 4  PC机与单片机的通信模块………………………………………………………...….……...21
 4.1 RS232简介…………………………………………….………………………………………21
  4.2 单片机与调制解调芯片ST7540之间的通信……………………………………………….22
 
5 电路电源模块……………….……………………...………….……..……………………………23
 5.1  5V、12V直流电压设计…………………………………..………….…….…………………23
6 外围接口电路设计………………………………………..………………………………………24
 6.1  LCD显示模块介绍………………………...…………………………………………………24
    6.2  LCD显示模块软件调试…………………………..………………………………………….26
 6.3  键盘输入模块介绍…………………………...…..……………………………………27
 6.4  报警模块介绍…………………………………………………………………………...…..28
7  硬件软件的调试、测试分析…………………………………...………………………………30
   7.1  基于ST7540的发送模块软件测试分析………………………………………..…………30
 7.2  基于ST7540的接收模块软件测试分析……………………………………..……………30
 7.3   Keil C集成工具简介……………………………………………………………………...32
8  总结………………………………………………………………………………………...………34
致谢…………………………………..…………………………………………………………………35
参考文献…………………………………………………………………….…………………………36
附   录   37

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