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本文主要介紹了數(shù)據(jù)服務(wù)器的硬件系統(tǒng)設(shè)計(jì)及軟件系統(tǒng)設(shè)計(jì)。本數(shù)據(jù)服務(wù)器是上位機(jī)與現(xiàn)場(chǎng)儀表進(jìn)行數(shù)據(jù)交換的橋梁 ,上下都采用RS4 85接口。數(shù)據(jù)服務(wù)器通過人為設(shè)定的采樣周期對(duì)現(xiàn)場(chǎng)儀表進(jìn)行采樣 ,讀回?cái)?shù)據(jù)并以一定的格式進(jìn)行存儲(chǔ)。數(shù)據(jù)服務(wù)器根據(jù)上位機(jī)發(fā)來的命令進(jìn)行相應(yīng)的操作 ,并返回?cái)?shù)據(jù)給上位機(jī) ,包括讀取當(dāng)前時(shí)間、所連儀表起始地址、單臺(tái)或全部?jī)x表的當(dāng)前數(shù)據(jù)、歷史數(shù)據(jù)。
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Introduction to RS485 RS232 , RS422 , RS423 and RS485 are serial communication methods for computers and devices. RS232 is without doubt the best known interface, because this serial interface is implemented on almost all computers available today. But some of the other interfaces are certainly interesting because they can be used in situations where RS232 is not appropriate. We will conce
RS485服務(wù)器知識(shí)來自于造價(jià)通云知平臺(tái)上百萬(wàn)用戶的經(jīng)驗(yàn)與心得交流。 注冊(cè)登錄 造價(jià)通即可以了解到相關(guān)RS485服務(wù)器最新的精華知識(shí)、熱門知識(shí)、相關(guān)問答、行業(yè)資訊及精品資料下載。同時(shí),造價(jià)通還為您提供材價(jià)查詢、測(cè)算、詢價(jià)、云造價(jià)等建設(shè)行業(yè)領(lǐng)域優(yōu)質(zhì)服務(wù)。手機(jī)版訪問:RS485服務(wù)器