摘要
针对传统的打铃系统信号接口多、控制功能单一等问题,提出了一种基于输电线传输的新型打铃测控系统.该系统应用载波调制和频分复用等技术,以微控制器AT89C51单片机作为系统的控制芯片,采用中断等指令对软件系统进行了编程设计,同时使用PCF8591、MAX232及相关电路实现了数据转换与通信.测试结果表明,接收端解调信号的周期为63μs,占空比为50%,与发送端调制信号参数一致,解调效果好,且响铃系统控制精准.该打铃测控系统成本低,维护管理方便.
There are many problems in traditional bell ringing system, such as multi-interface of signal and single control function. A new type of bell ringing measure and control system was proposed based on power line transmission, adopting carrier modulation and frequency division multiplexing technology. The system introduces the instructions such as interrupt to be programmed, using microcontroller unit microcontroller AT89C51 as the control chip and PCF8591, MAX232 and related circuit as the data transfer and communication module. The test result shows that the period of demodulated signal in receiver is 63 μs, and the duty cycle is 50%, which are the same as the signal parameters in sender, revealing the demodulation effect is good, and the bell ringing system can be control precisely. Besides the bell ringing system has low cost, and is convenient in maintenance and management.
出处
《武汉工程大学学报》
CAS
2017年第3期296-301,共6页
Journal of Wuhan Institute of Technology
基金
福建省教育厅A类科技项目(JA14244)
福建省自然科学基金(2014J01254)
厦门市科技计划项目(3502Z20153019)
关键词
电力载波通信
载波调制
打铃系统
测控传输
power line communication
carrier modulation
ringing system
information transmission
