开发板电路图
上传时间： 2013-10-13
上传用户：王庆才
The MAX3243E device consists of three line drivers, five line receivers, and a dual charge-pump circuit with±15-kV ESD (HBM and IEC61000-4-2, Air-Gap Discharge) and ±8-kV ESD (IEC61000-4-2, Contact Discharge)protection on serial-port connection pins. The device meets the requirements of TIA/EIA-232-F and provides theelectrical interface between an asynchronous communication controller and the serial-port Connector. Thiscombination of drivers and receivers matches that needed for the typical serial port used in an IBM PC/AT, orcompatible. The charge pump and four small external capacitors allow operation from a single 3-V to 5.5-Vsupply. In addition, the device includes an always-active noninverting output (ROUT2B), which allowsapplications using the ring indicator to transmit data while the device is powered down. The device operates atdata signaling rates up to 250 kbit/s and a maximum of 30-V/ms driver output slew rate.
标签： MULTICHANNEL 5.5 TO RS
上传时间： 2013-10-19
上传用户：ddddddd
The PL2303 USB to Serial adapter is your smart and convenient accessory forconnecting RS-232 serial devices to your USB-equipped Windows host computer. Itprovides a bridge connection with a standard DB 9-pin male serial port Connector inone end and a standard Type-A USB plug Connector on the other end. You simplyattach the serial device onto the serial port of the cable and plug the USB Connectorinto your PC USB port. It allows a simple and easy way of adding serial connectionsto your PC without having to go thru inserting a serial card and traditional portconfiguration.This USB to Serial adapter is ideal for connecting modems, cellular phones, PDAs,digital cameras, card readers and other serial devices to your computer. It providesserial connections up to 1Mbps of data transfer rate. And since USB does not requireany IRQ resource, more devices can be attached to the system without the previoushassles of device and resource conflicts.Finally, the PL-2303 USB to Serial adapter is a fully USB Specification compliantdevice and therefore supports advanced power management such as suspend andresume operations as well as remote wakeup. The PL-2303 USB Serial cable adapteris designed to work on all Windows operating systems.
上传时间： 2013-11-01
上传用户：ghostparker
PCB Layout Rule Rev1.70, 規範內容如附件所示, 其中分為: (1) ”PCB LAYOUT 基本規範”:為R&D Layout時必須遵守的事項, 否則SMT,DIP,裁板時無法生產. (2) “錫偷LAYOUT RULE建議規範”: 加適合的錫偷可降低短路及錫球. (3) “PCB LAYOUT 建議規範”:為製造單位為提高量產良率,建議R&D在design階段即加入PCB Layout. (4) ”零件選用建議規範”: Connector零件在未來應用逐漸廣泛, 又是SMT生產時是偏移及置件不良的主因,故製造希望R&D及採購在購買異形零件時能顧慮製造的需求, 提高自動置件的比例.
上传时间： 2013-11-03
上传用户：tzl1975
This document provides practical, common guidelines for incorporating PCI Express interconnect layouts onto Printed Circuit Boards (PCB) ranging from 4-layer desktop baseboard designs to 10- layer or more server baseboard designs. Guidelines and constraints in this document are intended for use on both baseboard and add-in card PCB designs. This includes interconnects between PCI Express devices located on the same baseboard (chip-to-chip routing) and interconnects between a PCI Express device located “down” on the baseboard and a device located “up” on an add-in card attached through a Connector. This document is intended to cover all major components of the physical interconnect including design guidelines for the PCB traces, vias and AC coupling capacitors, as well as add-in card edge-finger and Connector considerations. The intent of the guidelines and examples is to help ensure that good high-speed signal design practices are used and that the timing/jitter and loss/attenuation budgets can also be met from end-to-end across the PCI Express interconnect. However, while general physical guidelines and suggestions are given, they may not necessarily guarantee adequate performance of the interconnect for all layouts and implementations. Therefore, designers should consider modeling and simulation of the interconnect in order to ensure compliance to all applicable specifications. The document is composed of two main sections. The first section provides an overview of general topology and interconnect guidelines. The second section concentrates on physical layout constraints where bulleted items at the beginning of a topic highlight important constraints, while the narrative that follows offers additional insight.
上传时间： 2014-01-24
上传用户：s363994250
使用说明：请您先正确设置数据库及JDBC驱动。 参考： http://blog.raofeng.com/love/kiss/archives/2006/16.html http://blog.raofeng.com/love/kiss/archives/2006/13.html http://dev.mysql.com/downloads/Connector/j/3.1.html下载JDBC驱动 先新建一数据库(默认名为jspmo)建立数据库及表格的命令都在sql.txt内，可以直接复制到数据库里运行。 默认管理员名为: admin ,密码为:jspmo.com 请修改config.jsp中的name(管理员名),password(管理员密码),sitename(留言本标题),copyright(版权信息). 以及conn.jsp中的host(数据库服务器主机),user(数据库用户名),pw(数据库密码),db(数据库名),tab(数据库表名)。
标签： http blog archives raofeng
上传时间： 2015-10-25
上传用户：894898248
The Original USB 2.0 specification released on April 27, 2000 Errata to the USB 2.0 specification as of December 7, 2000 Mini-B Connector Engineering Change Notice to the USB 2.0 specification. Pull-up/pull-down Resistors Engineering Change Notice to the USB 2.0 specification. Errata to the USB 2.0 specification as of May 28, 2002 Interface Association Descriptor Engineering Change Notice to the USB 2.0 specification. Rounded Chamfer Engineering Change Notice to the USB 2.0 specification as of October 8, 2003 Unicode Engineering Change Notice to the USB 2.0 specification as of February 21, 2005 Inter-Chip USB Supplement Revision 1.0 as of March 13, 2006 Revision 1.3 of the USB On-The-Go Supplement as of December 5, 2006 Revision 1.01 of the Micro-USB Cables and Connectors Specification as of April 4, 2007 USB 2.0 Link Power Management Addendum Engineering Change Notice to the USB 2.0 specification as of July 16, 2007.
标签： specification 2.0 USB Original
上传时间： 2013-12-31
上传用户：familiarsmile
16 relay output channels and 16 isolated digital input channels LED indicators to show activated relays Jumper selectable Form A/Form B-type relay output channel Output status read-back Keep relay output values when hot system reset High-voltage isolation on input channels(2,500 VDC) Hi ESD protection(2,00VDC) High over-voltage protection(70VDC) Wide input range(10~50VDC) Interrupt handling capability High-density DB-62 Connector Board ID
标签： channels indicators activated isolated
上传时间： 2016-02-15
上传用户：dongbaobao
1、在Eclipse中导入工程，可以通过Eclipse中的菜单File→Import→Existing Projects intoWorkspace中选择Project； 2、在MySQL中创建数据库，使用MySQL Control Center执行database目录下的dbscript.sql数据库脚本文件创建数据库SQL语句创建数据库和表及数据； 3、设置数据库连接配置，修改doc目录下的exam.xml文件，将其中的数据库用户名和密码设置为实际的用户名和密码； 4、将doc目录下的exam.xml文件拷贝到Tomcat的安装目录下的conf\Catalina\localhost文件夹下，并修改exam.xml文件中的docBase，将该值指向该工程目录，如"F:\jsp\21\WebRoot"； 5、确保Tomcat安装目录的common\lib下mysql-Connector-java-3.0.16-ga-bin.jar类包文件，如果没有拷贝WebRoot\WEB-INF\lib目录下的mysql-Connector-java-3.0.16-ga-bin.jar类包文件到Tomcat安装目录的common\lib下； 6、启动Tomcat，在浏览器输入http://localhost:8080/exam，使用账号s0001，密码s0001登陆，后台管理使用账号admin，密码dmin登陆。
上传时间： 2013-12-21
上传用户：huannan88
留言簿架构 oracle 9i + jsp + struts 留言簿基本功能： 1 、客人签写留言 2 、基本的UBB支持，如[url]http://www.lunji.com[/url],[color="red"]红色字[/color] 3 、ctrl+enter可提交留言 4 、搜索留言 5 、悄悄话功能 安全： 1 、解决了连串字母将表格撑大问题 2 、用户名与留言内容不能太长或为空 3 、用户不能冒充版主留言 4 、屏垃圾语言功能 管理： 默认页为/admin/login.do 9 、留言簿基本参数的设置如留言簿标题，每页显示条数 10、设置版主信息 11、设置管理员用户名、密码 12、回复留言、编辑留言、删除留言 13、设置悄悄话功能的开启与关闭 14、垃圾语言过滤 15、在线更改最大留言字节数 安装： 1、在oracle中执行document/sql/guestbook.sql 2、设置tomcat server.xml中Connector配置节增加一个属性,URIEncoding="gb2312" 3、用记事本打开WEB-INF/classes/init.properties,修改其中的数据库ip地址，sid，帐号和密码等 首页默认为indx.do
上传时间： 2014-11-16
上传用户：zl5712176
