Delphi环境中介损在线检测串口通信的实现  

Serial communication implementation on Delphi platform for tan S monitoring

作　　者：江寒林[1] 

机构地区：[1]中国化工建设总公司山东化工规划设计院,山东济南250013

出　　处：《电力自动化设备》2005年第5期85-87,共3页Electric Power Automation Equipment

摘　　要：为实现分布式高压容性介损在线检测(包括电流互感器、套管、耦合电容器、电容式电压互感器等),介绍了基于RS-485总线方式建立的分布式数据采集系统的上下位机之间与RS-485的多点总线式主从应答方式通信,说明了通信格式和串行通信程序流程图。在Windows-NT环境中使用Delphi 6.0采用COMPORT控件实现串口通信。对传送信息的校验和错误处理有4种方法(均值、极大值、均方差、位累加冗余等校验)以提高数据传输的可靠性;并提出串口通信需要考虑的问题,包括计算机端口隔离保护、通信速率与距离的关系等。To realize the distributed on-line monitoring of high-voltage capacitive dielectric loss for current transformers, bushings, coupling capacitors, capacitive voltage transformers and so on, a distributed data acquisition system is established based on RS -485 bus,in which the multi-point master-slave communication mode via RS - 485 bus is adopted between the superordinate computer and the subordinate computers. The communication format and the flow chart of serial communication are illuminated. The serial communication is implemented with COMPORT of Delphi 6.0 in Windows - NT. There are four methods to enhance the reliability of data transmission: the mean value check, the maximum check, the mean square difference check and the sum redundance check. Some techniques of serial communication are presented, including isolation protection of computer port, relationship between communication speed and distance,and so on.

关 键 词：DELPHI编程 介质损耗 在线检测 串口通信 

分 类 号：TP311[自动化与计算机技术—计算机软件与理论]