The purpose of this application note is to describe the main elements of
an RS-422 and RS-485 system. This application note attempts to cover
enough technical details so that the system designer will have considered all
the important aspects in his data system design. Since both RS-422 and RS-
485 are data transmission systems that use balanced differential signals, it is
appropriate to discuss both systems in the same application note. Throughout
this application note the generic terms of RS-422 and RS-485 will be used to
represent the EIA/TIA-422 and EIA/TIA-485 Standards.
Patterns of Enterprise Application Architecture is written in direct response to the stiff challenges that face enterprise application developers. The author, noted object-oriented designer Martin Fowler, noticed that despite changes in technology--from Smalltalk to CORBA to Java to .NET--the same basic design ideas can be adapted and applied to solve common problems. With the help of an expert group of contributors, Martin distills over forty recurring solutions into patterns. The result is an indispensable handbook of solutions that are applicable to any enterprise application platform
通過(guò)對(duì)企業(yè)的報(bào)刊訂閱業(yè)務(wù)進(jìn)行分析、調(diào)查，報(bào)刊訂閱管理系統(tǒng)主要實(shí)現(xiàn)以下功能：
①錄入功能：錄入訂閱人員信息、報(bào)刊基本信息；
②訂閱功能：訂閱人員訂閱報(bào)刊（并計(jì)算出其金額）；
③查詢(xún)功能：按人員查詢(xún)、按報(bào)刊查詢(xún)、按部門(mén)查詢(xún)有關(guān)訂閱信息，對(duì)查詢(xún)結(jié)果能進(jìn)行預(yù)覽和打印；
④統(tǒng)計(jì)功能：按報(bào)刊統(tǒng)計(jì)、按人員統(tǒng)計(jì)、按部門(mén)統(tǒng)計(jì)，對(duì)統(tǒng)計(jì)結(jié)果能進(jìn)行預(yù)覽和打印；
⑤系統(tǒng)維護(hù)：如數(shù)據(jù)安全管理（含備份與恢復(fù)）、操作員管理、權(quán)限設(shè)置等；
⑥開(kāi)發(fā)環(huán)境：JAVA(Eclipse + SWT Designer)、SQL SERVER 2000、Windows XP Professional
