前面转载的几篇文章详细介绍了UART.RS-232和RS-485的相关内容,可以知道,串口通信的双方在硬件层面需要约定如波特率.数据位.校验位和停止位等属性,才可以正常收发数据.实际项目中使用串口通信时,一般还需要设计一套通讯协议.那么设计串口通讯协议有什么需要注意的地方呢?本文以iPod.车载CAN解码盒及IoT设备EnOcean的串口通讯协议为例,对通讯协议数据帧的定义做一个简单的介绍和分析. 首先看Apple提供的文档<iPod_Accessory_Protocol_Interface_S…

前面转载的几篇文章重点介绍了UART及RS-232.在工控领域除了RS-232以外,常用的串行通信还有RS-485.本文转载的文章重点介绍了RS-232.RS-422和RS-485. Overview This article explains the general concepts of the serial communication protocols RS-232, RS-422, and RS-485, including basic concepts like baud rate,…

RS-232串口一度像现在的USB接口一样,是PC的标准接口,用来连接打印机.Modem和其他一些外设.后来逐渐被USB接口所取代,现在PC上已经看不到它的身影了.开发调试时如果用到串口,一般都是用USB转串口头,如下图所示.左图为USB-to-RS-232,右图为USB-to-TTL.USB-to-RS-232和USB-to-TTL因电气特性不同,所以应用场合也不同,不能互换.本文所转载的文章,重点介绍了RS-232和TTL串口的异同. One of the tools we use most…

最近远程连接mysql总是提示 Lost connection 很明显这是连接初始化阶段就丢失了连接的错误 其实问题很简单,都是MySQL的配置文件默认没有为远程连接配置好,只需要更改下MySQL的配置文件即可.具体的解决步骤如下:找到并修改my.cnf文件.在不同的Linux系统下,my.cnf放在不同的位置.这里以Ubuntu Server做示例,其他系统请根据情况自行找到my.cnf的路径.一般只会存放在/etc/my.cnf或者/etc/mysql/my.cnf下.首先用vim打开my.…

导致的原因,可能是异常断电导致文件状态不一致. SQL> startupORACLE instance started. Total System Global Area 1653518336 bytesFixed Size                  2213896 bytesVariable Size             956303352 bytesDatabase Buffers          687865856 bytesRedo Buffers             …

今天在开发过程中,一个单位跑的好好的项目,在家中的Mac下运行时,遇到了下面这个错误:   "Lost connection to MySQL server at 'reading initial communication packet, system error: 61"   看错误描述应该是无法连接数据库,OK,我先检查数据库是否正常工作,phpmyadmin看了一下一切正常.   看了一下数据库配置:hostname 使用的是 127.0.0.1,看了一下网上的解决方案,大多是…

At this moment, I accomplish the interface of UART communication for PIC32MZ EC Starter Kit. This interface configures the PIC32MZ for communication with a host PC at 115200 baud. There are five functions in the interface -- Uart_Init(), Uart_Getc(),…

elastic communication是基于c#开发支持.net和mono的通讯组件(简称EC),EC的主要目的简化mono和.net下的通讯开发难度,通过EC可以非常快速地开发基于mono和.net的通讯交互应用.EC抽取的基础的通讯协议默认支持protobuf,msgpack的数据对象进行通讯交互,开发者不可以根据自己的制要制订更多的序列化方式支持:EC不紧紧支持简单的对像传输,还提供了控制器,方法控制器和更方便的远程接口调用功能. 以下是ES希望实现的最终目标 借助于Xamarin实现…

环境:在VirtualBox中安装了Ubuntu虚拟机,网络使用了NAT模式,开启了端口转发. 局域网内其他计算机访问虚拟机中的MySQL Server出现两个问题: Lost connection to MySQL server at 'reading initial communication packet, system error: 0 以及 host is not allowed to connect mysql 1.解决Lost connection to MySQL server…

在远程连接mysql的时候,连接不上,出现如下报错:Lost connection to MySQL server at 'waiting for initial communication packet', system error: 0截图如下: 原因分析:mysql开启了DNS的反向解析功能,这样mysql对连接的客户端会进行DNS主机名查找.mysql处理客户端解析过程:1)当mysql的client连过来的时候,服务器会主动去查client的域名.2)首先查找 /etc/hosts 文…

Universally Compatible Wireless Power Using the Qi Protocol Wireless charging of portable electronic devices is here now. It will become ubiquitous when all such devices adhere to the same standard. By Upal Sengupta and Bill Johns, Texas Instruments…

App层 从大拇哥Click CallButton开始手机便已明白,主人这是要打电话.当然,你可以选择直接拨号,也可以通过ContactList,或者从通话记录着手.这些都只是UI的设计不同而已,终归都会有一个统一的入口开始Calling.这个汇合点就是: android:targetActivity="OutgoingCallBroadcaster" 这是一个独立的Activity,你可以设计各种花里胡哨的拨号方式.Activities,而后通过startActivity跨应用访问来…

Topic Last Modified: 2005-05-24 Telnet is an extremely useful tool for troubleshooting issues related to SMTP and mail flow. For example, you can use telnet to: Verify that SMTP is installed properly, and that it has all the necessary commands. Ensur…

今天在使用Navicat连一个远程mysql时,总是提示连接不成功,提示Lost connection to MySQL server at 'reading initial communication packet 但mysql服务已经启动 百度查之,终于找到解决方法如下: 修改hosts.allow vi /etc/hosts.allow #加mysqld : ALL : ALLOW mysqld-max : ALL :ALLOW 再次连接,但又提示can't connect to mysq…

题 Andrea is a famous science fiction writer, who runs masterclasses for her beloved readers. The most popular one is the Alien Communication Masterclass (ACM), where she teaches how to behave if you encounter alien life forms or at least alien artifa…

目录 . Linux通信机制分类简介 . 控制机制 0x1: 竞态条件 0x2: 临界区 . Inter-Process Communication (IPC) mechanisms: 进程间通信机制 0x1: 信号(Signals) 0x2: 管道(Pipes) 0x3: 套接字(Sockets) 0x4: System V通信机制(System V IPC Mechanisms) . 多线程并行中的阻塞和同步 0x1: CPU指令集提供的原子操作(Atomic) 0x2: 操作系统提供的原子…

题目传送门 /* 题意:程序从1到n版本升级,正版+正版->正版,正版+盗版->盗版,盗版+盗版->盗版 正版+破解版->正版,盗版+破解版->盗版 DP:每种情况考虑一遍,递推就行了 注意:开long long */ #include <cstdio> #include <iostream> #include <algorithm> #include <cstring> #include <cmath> using…

ERROR (HY000): Lost connection to MySQL server at 'waiting for initial communication packet', system error: 2 在/etc/my.cnf[mysqld]中加skip-name-resolve…

1741. Communication Fiend Time limit: 1.0 second Memory limit: 64 MB Kolya has returned from a summer camp and now he's a real communication fiend. He spends all his free time on the Web chatting with his friends via ICQ. However, lately the protocol…

Computer Science An Overview _J. Glenn Brookshear _11th Edition activation 激活 parallel processing 并行处理 concurrent processing 并发处理 Each programming language tends to approach the parallel processing paradigm from its own point of view, resulting in di…

Research among project managers globally identifies top communication skills for leading teams. Leading people - the experiential side of project management - is as important as task-based skills according to project managers in Europe, the Middle Ea…

Communication System Time Limit: 1000MS Memory Limit: 10000K Total Submissions: 25006 Accepted: 8925 Description We have received an order from Pizoor Communications Inc. for a special communication system. The system consists of several devices. For…

点击打开链接 Communication System Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 21007   Accepted: 7449 Description We have received an order from Pizoor Communications Inc. for a special communication system. The system consists of several d…

http://www.crecorder.com/techInfo/commuProtocols.jsp COMMUNICATION PROTOCOLS A “communication protocol” is a means by which data is exchanged between the vehicle’s on-board computer and an external data retrieval device, such as a Code Reader or Scan…

今天用heidsql连接mysql时出了问题,提示:Lost connection to MySQL server at 'reading initial communication packet 网上搜索了答案,都说要修改配置文件..但是没有找到怎么办.. 解决方案:重装了一遍mysql连接驱动,重启mysql服务,恢复正常. 备注:问题原因不明.…

进程间通讯--inter-process communication  进程间相互通讯的方法有很多,如用web services,xml 等互相读取, 网络的可以使用socket 等. 2个WinForm程序相互通讯可以使用重写WndProc的方法,而WPF则不能. 先看如图效果: 首先新建一个空白解决方案IPC 新建一个WPF项目命名为AppA 我们只需要点击AppA中的button后AppB会提示已经点击即可,项目A的窗体XAML代码: <Window x:Class="IPC.App…

This is a tutorial for Android to do non-blocking bluetooth socket communication. I am using 32feet Bluetooth library, but it should be the same if you were using other network socket communication that reply on inputstream mechanism. In fact it is n…

当安装Cisco AnyConnect VPN Client出现The VPN client agent was unable to create the interprocess communication depot.时,请先在你的本地网络或无线网络中,设置如下: 注意其中的Checkbox并没有被选中!!!!!!…

Lost connection to MySQL server at 'reading initial communication packet' 错误解决 上次解决了这个问题,今天又碰到,突然失忆,又做了一番无用功后终于搞定,这次一定要记录下来,免得下次又浪费时间 1.修改mysql配置文件 vi /etc/my.cnf [mysqld]段加skip-name-resolve 在这个之前要把mysql的远程访问权限打开,或者再加skip-grant-table(不推荐) 2.修改hosts.a…

Problem A. Alien Communication Masterclass Time Limit: 1 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/gym/100610 Description Andrea is a famous science fiction writer, who runs masterclasses for her beloved readers. The most popular one is the…