【摘要】 汇编语言具有面向机器、最便于开发高效的设备驱动程序。本文分析了PC机、工控机之间实时通讯的几种方法，着重讨论了RS422、RS485的硬件接口连接和软件的实现。用汇编语言编制的通讯程度具有程序代码短、运行高效性强。对分布式控制系统的研究、开发具有较高的实用价值。更多还原

【Abstract】 The assembly language is machine - oriented, and is used to develop high efficient device driver.This paper discusses the methods of communication between PCs and industrial control computers; and states in detail the physical connection and programming. The communication program in assembly language is characterized by short executable code and high running speed, and has proved valuable in studying and developing the distributed control system.更多还原