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Modbus读写模拟量寄存器具体解释

读可读写模拟量寄存器：发送命令（主机向从机）格式：[设备地址][命令号03][起始寄存器地址高8位][低8位][读取的寄存器数高8位][低8位][CRC校验的低8位][CRC校验的高8位]例：[11][03][00][6B][00][03][CRC低][CRC高]意义例如以下：11：设备地址，样例中的地址是11，溶氧传感器端默认的地址是1，。03：读模拟量的命令号固定为03，这是Modbus协议规定的。00、6B：起始地址高8位（00）、低8位（6B）：表

系统 2019-08-12 01:55:39 3053

数据库相关

MongoDB学习笔记<四>

今天继续学习MongoDB的相关知识,主要包含例如以下:--find具体解释--分页与排序--游标和其它知识1.指定返回的键db.person.find({},{"_id":0,"name":1,"country":1})这样就仅仅把name键和country键查询出来了,注意其它的假设不写默认不显示,可是假设_id假设不写,默认是显示的.2.查询条件db.person.find({"age":{$gte:25,$lte:27}},{"_id":0,"na

系统 2019-08-12 01:53:01 3053

各行各业

Pentaho 4.1发布，优秀的开源商业智能解决方案

Pentaho4.1发布，优秀的开源商业智能解决方案-企业架构-ITeye资讯Pentaho最近已发布了其开源商业智能套件的4.1版本。该版本在数据分析性能、可扩展及可靠性方面做出了重大改进，并且支持分布式in-memory缓存系统。Pentaho是世界上最流行的开源商务智能（BusinessIntelligence，BI）解决方案。它是一个基于Java平台的BI套件，包括一个WebServer平台和几个工具软件：报表、分析、图表、数据集成、数据挖掘等工具

系统 2019-08-12 01:33:24 3053

各行各业

Vimux: simple vim and tmux integration

Vimux:simplevimandtmuxintegrationVimux:simplevimandtmuxintegrationbyBenMillsonApr11,2012AtBraintreewetakeourtoolsseriously.Wearealwayslookingforwaystoimproveourtoolchaintomakeusmoreproductive.Becausewepair-programfull-time,wehavea

系统 2019-08-12 01:33:21 3053

Python

selenium + python自动化测试环境搭建

selenium是一个web的自动化测试工具，不少学习功能自动化的同学开始首选selenium，相因为它相比QTP有诸多有点：*免费，也不用再为破解QTP而大伤脑筋*小巧，对于不同的语言它只是一个包而已，而QTP需要下载安装1个多G的程序。*这也是最重要的一点，不管你以前更熟悉C、java、ruby、python、或都是C#，你都可以通过selenium完成自动化测试，而QTP只支持VBS*支持多平台：windows、linux、MAC，支持多浏览器：ie

系统 2019-08-12 01:32:25 3053

编程技术

Contribute some useful custom control: XList

InmyVCMFCdevelopexpericence,IalwaysfindthatitisreallypooroftheCtrlsthatmicrosoftprovided,butwehavenomuchprojectbudgettobugabeautifulthird-ctrl.SosometimesweneeddosomeworktomodifythestandardControl.Forthepurposeofreuse,Ihavemylibra

系统 2019-08-29 22:24:43 3052

编程技术

以一种"廉价"的方式获取页面的标题(downmoon)

有朋友问到：“我需要得到一个webpage的title，因为这个title一般都比较靠前，只要取得html的前面少量内容就可以了。因为要取得很多个页面的title,如果下载整个htmlcode，肯定比较浪费时间。.net好像没有现成的类可以干这件事情(取得部分html)，我应该如何去实现？”一种比较"廉价"(即较小成本条件下)的解决思路：第一步：取出含有页面title部分的最小集合。这是“廉价”的关键！第二步：用正则表达式取出和</title</span> <p class="auth-span"> <span class="muted"><i class="fa fa-user"></i><span class="zj-icon-text">系统</span></span> <span class="muted"><i class="fa fa-clock-o"></i><span class="zj-icon-text">2019-08-29 22:21:16</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3052</span></span>  </p> </article><article class="excerpt"> <header> <a title="编程技术" class="label label-important zj-del-target" href="/category/30">编程技术<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/12200" title="我的大学--VC/MFC" target="_blank" onclick="return recordId('',)">我的大学--VC/MFC </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/12200" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/13.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/12200';}else{window.open('/article/12200');}" style="cursor: pointer;">VC基本操作四十条http://blog.csdn.net/liufei_learning/article/details/5262948MFC-控件变量源文档<http://blog.csdn.net/liufei_learning/article/details/5170368>MFC自定义消息源文档<http://blog.csdn.net/liufei_learning/archive/2009/12/10/4979923.aspx>VC运行时库源</span> <p class="auth-span"> <span class="muted"><i class="fa fa-user"></i><span class="zj-icon-text">系统</span></span> <span class="muted"><i class="fa fa-clock-o"></i><span class="zj-icon-text">2019-08-12 09:30:13</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3052</span></span>  </p> </article><article class="excerpt"> <header> <a title="CSS" class="label label-important zj-del-target" href="/category/68">CSS<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/11716" title="16 个新鲜的 CSS3 在线教程" target="_blank" onclick="return recordId('',)">16 个新鲜的 CSS3 在线教程 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/11716" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/5.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/11716';}else{window.open('/article/11716');}" style="cursor: pointer;">用CSS3制作令人印象深刻的产品展示使用jQuery和CSS3制作闪亮的旋钮控制使用CoffeeScript创建一个类iOS的界面使用CSS3制作报纸阅读制作一个CSS3动画菜单使用jQuery和CSS3制作更好的元素选择CSS3多级菜单，具有动画效果制作你的第一个Chrome扩展BounceBox提示插件色彩多样的滑动块使用jQuery和CSS3创建一个音频播放器CSS3和jQuery项目的模糊效果CSS3制作的动画按钮CSS3制作的圆形导航效果创建一个</span> <p class="auth-span"> <span class="muted"><i class="fa fa-user"></i><span class="zj-icon-text">系统</span></span> <span class="muted"><i class="fa fa-clock-o"></i><span class="zj-icon-text">2019-08-12 09:29:55</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3052</span></span>  </p> </article><article class="excerpt"> <header> <a title="编程技术" class="label label-important zj-del-target" href="/category/30">编程技术<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/11084" title="MapReduce 模式、算法和用例" target="_blank" onclick="return recordId('',)">MapReduce 模式、算法和用例 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/11084" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/5.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/11084';}else{window.open('/article/11084');}" style="cursor: pointer;">本文译自MapreducePatterns,Algorithms,andUseCases在这篇文章里总结了几种网上或者论文中常见的MapReduce模式和算法，并系统化的解释了这些技术的不同之处。所有描述性的文字和代码都使用了标准hadoop的MapReduce模型，包括Mappers,Reduces,Combiners,Partitioners,和sorting。如下图所示。基本MapReduce模式计数与求和问题陈述:有许多文档，每个文档都有一些字段组</span> <p class="auth-span"> <span class="muted"><i class="fa fa-user"></i><span class="zj-icon-text">系统</span></span> <span class="muted"><i class="fa fa-clock-o"></i><span class="zj-icon-text">2019-08-12 09:29:31</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3052</span></span>  </p> </article><div class="pagination" style="display:;"> <ul><li><a href="/search/scala/1/p/1">首页</a></li> <li class="prev-page"><a href="/search/scala/1/p/415">上一页</a></li> <li><a href="/search/scala/1/p/414">414</a></li><li><a href="/search/scala/1/p/415">415</a></li><li class="active"><span>416</span></li><li><a href="/search/scala/1/p/417">417</a></li><li><a href="/search/scala/1/p/418">418</a></li> <li class="next-page"><a 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