VLT5022PT5C

VLT5022PT5C

：（同號(hào)）/，
 
公司銷售的進(jìn)口備件從國(guó)外生產(chǎn)廠家直接進(jìn)貨，

實(shí)行扁平化的銷售模式，給客戶節(jié)約了時(shí)間和成本。

我們的目標(biāo)就是國(guó)內(nèi)用戶采購(gòu)國(guó)外備件遇到困難和疑難時(shí)都能找到我們。

我們能夠及時(shí)地報(bào)出優(yōu)惠的價(jià)格和迅捷的交貨期；國(guó)內(nèi)用戶采購(gòu)國(guó)外備件受到*代理壟斷價(jià)格時(shí)，

我們會(huì)給用戶提供一個(gè)比較的機(jī)會(huì)，并且為客戶提供的解決方案。由于我們的訂單集中，訂貨量大，

因此我們能提供頗具競(jìng)爭(zhēng)力的價(jià)格并能夠迅速交貨，我們*以來(lái)致力于解決國(guó)內(nèi)用戶采購(gòu)國(guó)外備件中的疑難問(wèn)題，

并為廣大用戶提供電氣及工控自動(dòng)化成套設(shè)備的購(gòu)銷、現(xiàn)場(chǎng)調(diào)試等全面周到的服務(wù)。

 
◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆
在每個(gè)平臺(tái)都有相應(yīng)的服務(wù)質(zhì)量（QoS）的要求。在ARC平臺(tái)對(duì)功耗、存儲(chǔ)量、處理速度、通訊能力等都有要求。S3C2410, CS8900A等芯片可以很好的滿足這些要求。在API平臺(tái)對(duì)運(yùn)行任務(wù)的個(gè)數(shù)，任務(wù)切換時(shí)間等也有要求，嵌進(jìn)式Web服務(wù)器和嵌進(jìn)式Linux能滿足這些要求。在ASP平臺(tái)要求進(jìn)行實(shí)時(shí)的參數(shù)查看和參數(shù)設(shè)定。采用Java Applet能很好的做到這些。VLT5022PT5C

對(duì)嵌進(jìn)式控制器系統(tǒng)進(jìn)行平臺(tái)的劃分，并且對(duì)各個(gè)平臺(tái)提出相應(yīng)的服務(wù)質(zhì)量參使我們?cè)谠O(shè)計(jì)的初始階段對(duì)整個(gè)設(shè)計(jì)有全局的觀念，由于各個(gè)平臺(tái)之間相對(duì)獨(dú)對(duì)以后出現(xiàn)的新的設(shè)計(jì)要求和設(shè)計(jì)修改具有很好的適應(yīng)能力。

5 基于UML-RT的嵌進(jìn)式控制器設(shè)計(jì)

在對(duì)嵌進(jìn)式控制器劃分平臺(tái)后，我們可以用UML-RT的符號(hào)體系對(duì)嵌進(jìn)式控制器系統(tǒng)進(jìn)行建模。我們把建模的過(guò)程分為兩個(gè)階段。*階段是考慮系統(tǒng)的對(duì)外接口。第二階段是考慮系統(tǒng)內(nèi)部的平臺(tái)建模。

在*階段，嵌進(jìn)式控制器的建模見(jiàn)圖4。根據(jù)前面用例圖的需求分析，得出系統(tǒng)需要與環(huán)境交互的端口有兩個(gè):一個(gè)是與控制對(duì)象即智能儀表進(jìn)行通訊。一個(gè)是和用戶進(jìn)行交互。為了支持和用戶交互以及控制對(duì)象通訊，我們定義了兩個(gè)容器（capsule）u :User InteRFace和t : Transfer Data。容器p :Process Data則是用來(lái)處理數(shù)據(jù)。容器可以包含相關(guān)的軟件和硬件結(jié)構(gòu)，數(shù)據(jù)傳送可通過(guò)并口和串口進(jìn)行，這種傳送和處理器藕合的很緊，我們用UML-RT的擴(kuò)展符號(hào)表示。同樣，《SW p1》表示在處理器P1上執(zhí)行的處理與控制對(duì)象通訊的程序。我們用這種方式還可以對(duì)u :User Interface和p :Process Data進(jìn)行細(xì)化。

圖4 嵌進(jìn)式控制器的*階段表示

在*階段的基礎(chǔ)之上，我們結(jié)合前面對(duì)平臺(tái)的劃分，進(jìn)行平臺(tái)建模。系統(tǒng)的ARC平臺(tái)的建模如圖5所示。

圖5 ARC平臺(tái)下的UML-RT建模

圖5表示了ARC平臺(tái)的基本組件和它們的拓?fù)鋱D結(jié)構(gòu)，利用這個(gè)圖可以進(jìn)一步的進(jìn)行對(duì)象建模。這個(gè)模型提供了一個(gè)框架，并可以方便的增加，移動(dòng)，替換，修改框架內(nèi)的元素。UML-RT的端口可以有效的表示模型元素之間的接口。

API平臺(tái)處于ARC平臺(tái)和ASP平臺(tái)之間，包括RTOS嵌進(jìn)式Web服務(wù)器，設(shè)備驅(qū)動(dòng)程序等。從UML-RT角度看，API平臺(tái)是ARC容器與ASP容器之間的通訊管道。在這里ARC容器和ASP容器直接通過(guò)連接器相連。

ARC Proxy從ASP容器的端口中接收調(diào)用信息，然后把這個(gè)信息通過(guò)RTOS API送到合適的設(shè)備驅(qū)動(dòng)程序，讓設(shè)備驅(qū)動(dòng)程序往和ARC平臺(tái)通訊。異步或同步的通訊可以通過(guò)這個(gè)方式進(jìn)行。驅(qū)動(dòng)程序和RTOS是緊密相關(guān)的。ASP平臺(tái)的建模同樣可以通過(guò)類似的方式表現(xiàn)。

綜上所述，結(jié)合UML-RT和Platform進(jìn)行嵌進(jìn)式控制器的設(shè)計(jì)，我們看到它們能夠很好的對(duì)嵌進(jìn)式軟硬件進(jìn)行抽象，提供良好的文檔資料?；赨ML-RT和Platform設(shè)計(jì)的系統(tǒng)架構(gòu)，對(duì)設(shè)計(jì)過(guò)程出現(xiàn)的新的設(shè)計(jì)要求和設(shè)計(jì)修改具有很好的適應(yīng)能力，設(shè)計(jì)者可以及早的發(fā)現(xiàn)并更正錯(cuò)誤。

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