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.
标签： application describe elements purpose
上传时间： 2013-12-29
上传用户：sxdtlqqjl
一:需求分析 1. 问题描述 魔王总是使用自己的一种非常精练而抽象的语言讲话,没人能听懂,但他的语言是可逐步解释成人能听懂的语言,因为他的语言是由以下两种形式的规则由人的语言逐步抽象上去的: ----------------------------------------------------------- (1) a---> (B1)(B2)....(Bm) (2)[(op1)(p2)...(pn)]---->[o(pn)][o(p(n-1))].....[o(p1)o] ----------------------------------------------------------- 在这两种形式中,从左到右均表示解释.试写一个魔王语言的解释系统,把 他的话解释成人能听得懂的话. 2. 基本要求: 用下述两条具体规则和上述规则形式(2)实现.设大写字母表示魔王语言的词汇 小写字母表示人的语言的词汇 希腊字母表示可以用大写字母或小写字母代换的变量.魔王语言可含人的词汇. (1) B --> tAdA (2) A --> sae 3. 测试数据: B(ehnxgz)B 解释成 tsaedsaeezegexenehetsaedsae若将小写字母与汉字建立下表所示的对应关系,则魔王说的话是:"天上一只鹅地上一只鹅鹅追鹅赶鹅下鹅蛋鹅恨鹅天上一只鹅地上一只鹅". | t | d | s | a | e | z | g | x | n | h | | 天 | 地 | 上 | 一只| 鹅 | 追 | 赶 | 下 | 蛋 | 恨 |
上传时间： 2014-12-02
上传用户：jkhjkh1982
我们做微机硬件综合实验做的一个交通信号灯实时控制系统设计，很好哦！还附有实验报告．-A traffic lights real-time control system design of the micro computer hardware experiment.PS:contain the experiment report
上传时间： 2015-11-17
上传用户：924484786
We have a group of N items (represented by integers from 1 to N), and we know that there is some total order defined for these items. You may assume that no two elements will be equal (for all a, b: a<b or b<a). However, it is expensive to compare two items. Your task is to make a number of comparisons, and then output the sorted order. The cost of determining if a < b is given by the bth integer of element a of costs (space delimited), which is the same as the ath integer of element b. Naturally, you will be judged on the total cost of the comparisons you make before outputting the sorted order. If your order is incorrect, you will receive a 0. Otherwise, your score will be opt/cost, where opt is the best cost anyone has achieved and cost is the total cost of the comparisons you make (so your score for a test case will be between 0 and 1). Your score for the problem will simply be the sum of your scores for the individual test cases.
标签： represented integers group items
上传时间： 2016-01-17
上传用户：jeffery
TinyLogin is a suite of tiny Unix utilities for handling logging into, being authenticated by, changing one s password for, and otherwise maintaining users and groups on an embedded system. It also provides shadow password support to enhance system security. TinyLogin is, as the name implies, very small, and makes an excellent complement to BusyBox on an embedded System. It can be used without BusyBox, of course, but I envision them being used together most of the time.
标签： authenticated TinyLogin utilities handling
上传时间： 2016-01-30
上传用户：253189838
be文件系统实现的源码，其配套资料为Practical File System Design
上传时间： 2013-12-30
上传用户：woshini123456
Fax and soft modem source code. - Fast Version You can use this code to build a soft modem function in your embedded system.
上传时间： 2016-08-04
上传用户：彭玖华
Fax and soft modem source code. - Slow modem You can use this code to build a soft modem function in your embedded system. This is a slow version
上传时间： 2016-08-04
上传用户：wanghui2438
It shows you how to use the Quartus® II software to create and process your own Nios II system design that interfaces with components on Nios development boards.
标签： software Quartus process create
上传时间： 2016-11-16
上传用户：skfreeman
业务管理：包括客房预订、入住登记、续住、换房、转账、其他服务提供、留言板、意见簿、走客结账、欠费结算。 ¯ 查询统计：包括历史单据、预订表、在住客人表、换房查询、转账查询、日经营状况、月收入状况、客房利用率、实时房态。-system design focus of this chapter describe the development of small PowerBuilder 9.0 Rooms Management System process, through the study of this chapter, readers should be familiar with PowerBuilder 9.0 TreeView control and the right mouse button menu of use, master GroupBox, SingleLineEdit, CommandButton, RadioButton, PictureButton controls such as the similarities and differences to further understanding of data objects window displays various occasions the application. System to complete the task Macr system maintenance include : corporate information, the operator management, change passwords, management succession, dictionary management. Macr basic information : Rooms management system for the basic information management (including new, modify or delete), which is the basic informat
上传时间： 2017-02-09
上传用户：songyue1991
