本文給出了一種由MCP250505 構(gòu)成的無需外加CPU 的CAN 總線節(jié)點(diǎn)的設(shè)計(jì)方案，介紹了CAN 總線網(wǎng)絡(luò)節(jié)點(diǎn)的硬件設(shè)計(jì)和軟件設(shè)計(jì)，并對(duì)MCP25050 的特性以及相關(guān)協(xié)議作了詳細(xì)分析。實(shí)驗(yàn)表明，該系統(tǒng)具有結(jié)構(gòu)簡(jiǎn)單、可靠性高、使用靈活方便、性能價(jià)格比高等特點(diǎn)，在分布式數(shù)據(jù)采集和控制中具有廣闊的應(yīng)用前景。
關(guān)鍵詞: CAN；現(xiàn)場(chǎng)總線；MCP25050；網(wǎng)絡(luò)節(jié)點(diǎn)
Abstract : This paper presents a kind of design scheme for distributed measure and control system based on CAN bus with CAN I/O expander MCP25050. A hardware design for main node and the CAN bus interface are proposed, and the overall architecture, hardware configuration, software functions are discussed in detail. It is indicated through experiment
that the system is simple, reliable and cheap for CAN bus application.
Key words: Field bus； CAN； Measure control node； Distributed control