【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、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序具有程序代码短、运行高效性强的特点。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】 Assembly language is machine -oriented,and used todevelop high efficient device driver. The methods of cornmunication between PCs and industrial control computers,is discussed in this paper. In which physical connection and programming is stated in details. The communication program with assembly language is short executable code and high speed in running. It proves valuable in studying and developing the distributed control system.更多还原