This paper aims at the request of distribution automation and the disadvantages of existent ttu products and puts forward a scheme of ttu design : dsp ic tms320lf2407a of ti ltd . is chosen as a controller because of its high performance ; a three - phase power / energy ic developed by sames ltd . is used as a measure module to simplify the hardware circuit and software program ; the embedded modem and rs485 / rs232 mode communication interfaces are designed to make the data transfer more flexible and effective ; the 101 communication protocols of international electric power standard are adopted to improve its compatibility 本文针对配电自动化的要求及现有ttu产品的不足，提出了一种基于dsp的配电变压器远方终端单元的研制方案：微控制器选用ti公司高性能定点dsp芯片tms320lf2407a ；使用sames公司推出的三相电能计量芯片sa9904a作为测量模块，简化了硬件电路和软件编程；采用siliconlaboratories的嵌入式modem 、 rs485 rs232等多种通信方式，使数据传送变得灵活、高效；为了提高设备兼容性及通用性，通信协议采用国际电力标准101规约。
The " yunnan international industry exposition 2004 " , " yunnan international mining exhibition 2004 " and " kunming international power & energy sources expo 2004 " will correspond to the situation of international industry development , devote themselves to the application of most advanced technology and the discussion of hot issues , and the industrial it will be given a perfect display in the expo 2004年云南国际工业博览会、 2004年云南矿业国际展览会与2004昆明国际电力能源工业博览会将切合国际工业发展态势，致力于顶尖技术应用，与热点问题的探讨，工业it将在本次博览会中得到完美体现，热点问题将得以深入交流。
The important exhibitions which we have successfully participated in are as follows : china electronic commercial conference , international communication show , international science and technology exhibition , international power exhibition , international building materials show , machinery exhibition , international automobile exhibition , real estate exhibition , garments and accessories show , photograph materials show , hardware products exhibition , international fire control exhibition , hydro - technology show , medical apparatus and instruments exhibition , guangzhou commodities fair and youth commodities fair , etc 我们成功参与的重要展览有：中国电子商务大会、国际通信展、科技展、国际电力展、建材国际展、机械展、国际汽车展、房地产展、服装服饰展、照相器材展、五金制品展、国际消防展、水技术展、医疗器械展、广交会、深交会等众多知名展会。
