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基于89C2051单片机的热表通讯模块的开发电子书
摘要:介绍了利用89C2051 单片机开发某热表的通讯模块,并将其应用于实验用主从分布式控制系统中,实现了工控机同多个热表的串行通讯。阐述了串行通讯规程,利用单片机的普通I/ O 端口实现串行口功能的方法,从而解决了该单片机在实际的串行通讯应用中串口资源少的问题。通讯模块通过RS - 485 通讯方式实现了热表与工控机的远距离通讯。在充分利用单片机端口资源的基础上完成了工控机与多台单片机通讯。
关键词:单片机;串行通讯;普通I/ O 端口;RS - 485 ;多机通讯
Development of Heatmeter Communication Module Based on 89C2051 Single2chip Computer
WANG Yu ,LOU Cheng2zhi ,AN Da2wei , ZHANG Xiao2yun
(College of Environment Science and Engineering ,Tianjin University ,Tianjin 300072 ,China)
Abstract :Introduced how to use 89C2051 single2chip computer to develop the heatmeter communication module and applied the
module in a library distributed control system to realize the data communication between the industry computer and several heatmeters.
Serial communication rules were indicated. Afine method that making the I/ O port of single2chip computer achieve serial communication
portps function was put forward to resolve the problem that most single2chip computers lack serial communication port in real project ap2
plication. Further more ,narrated how the module realizes long2distance communication through RS - 485.Besides ,it takes good measures
to make good use of hardware resource finishing multi2point communication.
Key Words :Single2chip Computer ;Serial Communication ;Common I/ O Port ;RS - 485 ;Multi2point Communication