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介绍了基于美国Ａ─Ｂ公司ＳＬＣ５００系列可编程序控制器的ＤＨ４８５工业局域网（简称ＤＨ４８５网）及ＮＯＶＥＬＬ计算机局域网（简称ＮＯＶＥＬＬ网），着重讨论了ＤＨ４８５网与ＮＯＶＥＬＬ网的实时通信技术，并对这两个异型网的互连及实时通信作了进一步探讨。
This paper introduces DH485 industrial LAN (referred to as DH485 network) and NOVELL computer local area network (NOVELL network) based on US A ─ B company SLC500 series programmable controller, focusing on the real-time communication technology of DH485 network and NOVELL network, Two special-shaped network interconnection and real-time communication made further discussion.