SIEMENS RD63F200
智能儀表通信功能是智能儀表DCS系統(tǒng)實(shí)現(xiàn)的基礎(chǔ)，在參考一些已有的協(xié)議的基礎(chǔ)上，我們合理設(shè)計(jì)了通信功能的硬件和軟件，提出了多智能儀表控制系統(tǒng)協(xié)議，其總體通信策略采用預(yù)約協(xié)議，即時(shí)間被分成時(shí)間片，每個(gè)智能儀表利用預(yù)先留用的時(shí)間片與主機(jī)通信?，F(xiàn)場(chǎng)總線的網(wǎng)絡(luò)層次模型借鑒OSI七層協(xié)議，并進(jìn)行了部分?jǐn)U展，側(cè)重于工業(yè)應(yīng)用，構(gòu)成工業(yè)現(xiàn)場(chǎng)的通信網(wǎng)絡(luò)。本設(shè)計(jì)中具體的網(wǎng)絡(luò)規(guī)范采用了OSI協(xié)議中的應(yīng)用層、網(wǎng)絡(luò)層、數(shù)據(jù)鏈路層、物理層。在物理層，該系統(tǒng)現(xiàn)場(chǎng)總線的傳輸介質(zhì)采用RS-485雙絞線。在數(shù)據(jù)鏈路層，其主要功能是：信息幀的裝配和分解，差錯(cuò)控制和處理。波特率采用標(biāo)準(zhǔn)的1200、2400、4800、9600，可根據(jù)系統(tǒng)設(shè)計(jì)要求進(jìn)行選取；傳輸幀采用標(biāo)準(zhǔn)的UART格式。
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