The conception of difference data has been brought forward . at the same time , the program has been designed to ensure the facticity , real - time and integrality of the data that were transported in network 提出了差分?jǐn)?shù)據(jù)的概念,并通過(guò)程序設(shè)計(jì)實(shí)現(xiàn)對(duì)數(shù)據(jù)庫(kù)數(shù)據(jù)完整性的約束,保證前臺(tái)和后臺(tái)的雙向傳輸數(shù)據(jù)的正確性。
Due to the merits of pollution - free , adjustable power factor and bi - direction power transfer , the pwm rectifier can be an ideal electric appliance or a linkage between grid - line and other electric facilities 由于可以實(shí)現(xiàn)電網(wǎng)無(wú)污染、功率因數(shù)可控以及電能的雙向傳輸, pwm整流器可以作為理想的用電設(shè)備或電網(wǎng)與其它電氣設(shè)備的接口。
Electrical and mechanical interface characteristics and line control protocol using communication control characters for serial data link between a direct numerical control system and numerical control equipment employing asynchronous full duplex transmission 電子和機(jī)械界面特性和在直接數(shù)字控制系統(tǒng)與用同步完全雙向傳輸的數(shù)字控制設(shè)備之間的系列數(shù)據(jù)鏈接的通信控制字符的線路控制協(xié)議
The fieldbus technology is the popular technology in the field of industrial measurement and control . it is a completely digital , bi - directional and multiple - branches communication network which connects the intelligent field devices and the automatic system 現(xiàn)場(chǎng)總線技術(shù)是當(dāng)今工業(yè)測(cè)控領(lǐng)域內(nèi)的熱門技術(shù),它是連接智能現(xiàn)場(chǎng)設(shè)備和自動(dòng)化系統(tǒng)的全數(shù)字、雙向傳輸、多分支結(jié)構(gòu)的通信網(wǎng)絡(luò)。
Firstly bidirectional remote digital data was transferred on the public switched telephone network ( pstn ) using its fax mode in the remote diagnostic system , and then the hardware of client terminal device and server device , the control software and diagnostic software of service center were designed 提出了使用公用電話網(wǎng)將終端車輛與服務(wù)中心相連接,運(yùn)用傳真通訊模式實(shí)現(xiàn)數(shù)字信號(hào)雙向傳輸,并設(shè)計(jì)開(kāi)發(fā)了由用戶終端數(shù)據(jù)處理裝置和服務(wù)器端數(shù)據(jù)處理裝置組成的硬件系統(tǒng),以及相應(yīng)的控制軟件和服務(wù)中心診斷軟件。
Fieldbus is a kind of communication network which is a whole digitial communication multi _ embranchment data bus between intelligential field device and auto _ system . control system based on pcs ( fieldbus control system ) is a new kind of system which connect field control unit , field monitor unit , operation unit , communication interface uint with databus . lt integrates computer technology , communication technology and process cnotrol technology to adjust to demand of high standard productive control and enterprise management . lt developments and follows the advantage of traditional instrument control system and computer central control system and make up for their disadvantage so that it is applied in different industrial cnotrol area 現(xiàn)場(chǎng)總線是連接智能現(xiàn)場(chǎng)設(shè)備和自動(dòng)化系統(tǒng)的數(shù)字式、雙向傳輸、多分支的通信網(wǎng)絡(luò)。它是一種能支持雙向、多節(jié)點(diǎn)、總線式的全數(shù)字通信網(wǎng)絡(luò)?;诂F(xiàn)場(chǎng)總線技術(shù)的控制系統(tǒng)是一種新型的控制系統(tǒng),它采用總線方式將現(xiàn)場(chǎng)控制單元、現(xiàn)場(chǎng)監(jiān)視單元、操作站、通信接口單元連接起來(lái),綜合了計(jì)算機(jī)技術(shù)、通信技術(shù)和過(guò)程控制技術(shù),以適應(yīng)現(xiàn)代高水平生產(chǎn)控制與企業(yè)管理的需要。
Ftp ( file transfer protocol ) is one of the services provided by the internet , through ftp services from the internet , authorized users can use the computer to gain the necessary documents and the local files can also be transmitted to other computers , this is two - way transmission of documents between computers provided an effective means Ftp ( filetransferprotocol )是internet中最早提供的服務(wù)之一,通過(guò)ftp服務(wù), internet上的用戶可以從授權(quán)的異地計(jì)算機(jī)上獲取所需的文件,也可以把本地文件傳輸?shù)狡渌?jì)算機(jī)上,這就為計(jì)算機(jī)之間雙向傳輸文件提供了一種有效的手段。
Local multipoint distribute service ( lmds ) is newly developing fixed broadband wireless access technology . because of the large amount of spectrum available at the frequencies millimeter wave technology operates , it has the capability of providing " fiber - like " speeds and offering bi - directional voice , data and video service 本地多點(diǎn)分布式業(yè)務(wù)lmds是剛剛興起的固定寬帶無(wú)線接入技術(shù),工作在較高頻段( 10 40ghz ) ,屬于微波通信,可用頻譜較寬,因此可提供很寬的帶寬(達(dá)1ghz以上) ,有“無(wú)線光纖”之美譽(yù),可實(shí)現(xiàn)雙向傳輸話音、數(shù)據(jù)圖象、視頻等寬帶業(yè)務(wù)。
Experiment indicates that the converter realizes the data transfers function between the rs232 serial communicating port and the ethernet rj - 45 connector . it means that the converter realizes the protocol conversion . the software of the protocol converter is developed by the client / server mode 實(shí)驗(yàn)表明本論文設(shè)計(jì)實(shí)現(xiàn)的協(xié)議轉(zhuǎn)換器系統(tǒng)板實(shí)現(xiàn)了rs232串行通訊口與以太網(wǎng)rj - 45接口的數(shù)據(jù)雙向傳輸功能,也就是說(shuō)可以完成rs232串行通訊口協(xié)議與tcp ip協(xié)議的協(xié)議轉(zhuǎn)換功能。
One of the most important events in the history of the development of tv technologies is the implementation of digital compression technology , which leads tv industry into a new rapidly developing stage . with satellite , cable and terrestrial transmission channels , dvb , of which the digital compression is the core technology , has such features as two - way channels , interactive functions , etc . in dvb system , the information of video , audio and text is digitalized and integrated to form a new kind of tv program . furthermore , through online digital information broadcasting , people can browse information of other programs while watching several programs just as they have done on the internet 電視技術(shù)發(fā)展史上最重要的里程碑是數(shù)字壓縮技術(shù)的廣泛應(yīng)用,它將電視事業(yè)帶入一個(gè)新的高速發(fā)展時(shí)期,以數(shù)字壓縮為核心技術(shù)的數(shù)字電視廣播通過(guò)衛(wèi)星有線和地面?zhèn)鬏斁哂卸喙δ?font color="#cc0033">雙向傳輸交互性等特點(diǎn),不僅將圖像聲音和文字等信息數(shù)字化,而且將有關(guān)信息相互鏈接并有機(jī)地結(jié)合在一起形成了新的節(jié)目形態(tài),特別是其采用了數(shù)字信息在線廣播方式,觀眾在收看到多套節(jié)目的同時(shí)還可以像訪問(wèn)互聯(lián)網(wǎng)那樣瀏覽其它節(jié)目信息。