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 提出了差分数据的概念，并通过程序设计实现对数据库数据完整性的约束，保证前台和后台的双向传输数据的正确性。
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 由于可以实现电网无污染、功率因数可控以及电能的双向传输， pwm整流器可以作为理想的用电设备或电网与其它电气设备的接口。
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 电子和机械界面特性和在直接数字控制系统与用同步完全双向传输的数字控制设备之间的系列数据链接的通信控制字符的线路控制协议
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 现场总线技术是当今工业测控领域内的热门技术，它是连接智能现场设备和自动化系统的全数字、双向传输、多分支结构的通信网络。
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 提出了使用公用电话网将终端车辆与服务中心相连接，运用传真通讯模式实现数字信号双向传输，并设计开发了由用户终端数据处理装置和服务器端数据处理装置组成的硬件系统，以及相应的控制软件和服务中心诊断软件。
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 现场总线是连接智能现场设备和自动化系统的数字式、双向传输、多分支的通信网络。它是一种能支持双向、多节点、总线式的全数字通信网络。基于现场总线技术的控制系统是一种新型的控制系统，它采用总线方式将现场控制单元、现场监视单元、操作站、通信接口单元连接起来，综合了计算机技术、通信技术和过程控制技术，以适应现代高水平生产控制与企业管理的需要。
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中最早提供的服务之一,通过ftp服务, internet上的用户可以从授权的异地计算机上获取所需的文件,也可以把本地文件传输到其他计算机上,这就为计算机之间双向传输文件提供了一种有效的手段。
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 本地多点分布式业务lmds是刚刚兴起的固定宽带无线接入技术，工作在较高频段( 10 40ghz ) ，属于微波通信，可用频谱较宽，因此可提供很宽的带宽(达1ghz以上) ，有“无线光纤”之美誉，可实现双向传输话音、数据图象、视频等宽带业务。
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 实验表明本论文设计实现的协议转换器系统板实现了rs232串行通讯口与以太网rj - 45接口的数据双向传输功能，也就是说可以完成rs232串行通讯口协议与tcp ip协议的协议转换功能。
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 电视技术发展史上最重要的里程碑是数字压缩技术的广泛应用,它将电视事业带入一个新的高速发展时期,以数字压缩为核心技术的数字电视广播通过卫星有线和地面传输具有多功能双向传输交互性等特点,不仅将图像声音和文字等信息数字化,而且将有关信息相互链接并有机地结合在一起形成了新的节目形态,特别是其采用了数字信息在线广播方式,观众在收看到多套节目的同时还可以像访问互联网那样浏览其它节目信息。
