一种基于优先级控制的多路办公电话防盗计费系统  

A Priority-based Control of Multi-way Billing Office Phone Anti-theft System

作　　者：杨国建[1] 王琢[1] 杨林[1] 刘甜甜[1] 吴刚[1] 张倩[1] 

机构地区：[1]东北林业大学机电工程学院,黑龙江哈尔滨150040

出　　处：《工业控制计算机》2010年第1期96-97,共2页Industrial Control Computer

摘　　要：针对在PC机和单片机频繁通信的情况下,传统的主机轮询从机的方式占用大量的CPU时间,效率低,实时性和可靠性很差的缺陷,介绍一种串行通信的新方法——基于编码器74LS148的优先级判定法,实现了PC与单片机一对多通信,有效的解决了办公电话多路控制的问题。实际应用证明,该设计可靠,稳定性好。Single-chip in the PC and frequent communication,the traditional host polling the way from the plane occupied by a large number of CPU time,low efficiency,poor real-time performance and reliability of the defects,this paper introduces a serial communication new method-based on the encoder 74LS148 to determine the priority of law,the realization of a PC with the single-chip one-to-many communications,effective multi-office telephone control.Practical application proved that the design of reliable and stable.

关 键 词：单片机 74LS148 RS232 总线 优先级 

分 类 号：TP277[自动化与计算机技术—检测技术与自动化装置] TN915.1[自动化与计算机技术—控制科学与工程]