Ethernet as the most popular technology of local-area network, has the advantages of fast speed, low-cost, convenience of installation and good compatibility, but since it exploits CSMA/CD as the MAC protocol, whichre...Ethernet as the most popular technology of local-area network, has the advantages of fast speed, low-cost, convenience of installation and good compatibility, but since it exploits CSMA/CD as the MAC protocol, whichresults in the "uncertainty" of data communication, it cannot be applicable to real-time communication fields, such asindustry automated control. This paper presents a hard real-time communication technique based on Ethernet namedARTC, which has well-formed architecture and is easy to be implemented, at the same time, there is no need of mod-ifying the hardware of Ethernet. ARTC utilizes the methods of command/response multiple transmission and bustable to allot low-level communication bandwidth. It supports station management, on-line participation and automat-ic generation of bus table. ARTC, which is oriented to message, also provides the guarantee of hard real-time com-munication and has characteristics of reliability and fine extensibility.展开更多
文摘Ethernet as the most popular technology of local-area network, has the advantages of fast speed, low-cost, convenience of installation and good compatibility, but since it exploits CSMA/CD as the MAC protocol, whichresults in the "uncertainty" of data communication, it cannot be applicable to real-time communication fields, such asindustry automated control. This paper presents a hard real-time communication technique based on Ethernet namedARTC, which has well-formed architecture and is easy to be implemented, at the same time, there is no need of mod-ifying the hardware of Ethernet. ARTC utilizes the methods of command/response multiple transmission and bustable to allot low-level communication bandwidth. It supports station management, on-line participation and automat-ic generation of bus table. ARTC, which is oriented to message, also provides the guarantee of hard real-time com-munication and has characteristics of reliability and fine extensibility.
