【摘要】 介绍一种PC微机与单片机构成的主从分布式系统。单片机通过总线直接与PC机串行口连接,还介绍了为适应在无通讯控制器条件下主从机之间的多机通讯和系统硬件和通讯软件,讨论了这一系统具体应用有关问题。更多还原

【Abstract】 This paper presents a master -salve distributed system composed of PC personal computer and single chip microprocessors, in which single chip microprocessors are directly connected with serial port of PC personal computer through bus (RS422 or RS485A) without communication controller between master and salve computers. The paper also describes the method of constructing address frame and data frame by programming serial port of the master in order to fit for communication betweeb master and salve computers without communication controller. In addtion, the paper discusses hardware and software of the system and some problems in using the system.更多还原