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,…

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…

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…

4.10. Class Design HintsWithout trying to be comprehensive or tedious, we want to end this chapter with some hints that will make your classes more acceptable in well-mannered OOP circles. 1. Always keep data private. This is first and foremost; doin…

MGR优雅升级到MySQL8.0.16 传统的升级手段之一,5.7 MGR集群与8.0 MGR集群进行数据传输,程序切换新集群后测试是否正常. 如果不正常,要么将新集群的新增数据同步回旧集群,要么就舍弃掉这部分数据,一般看来这种回滚都是繁琐的,繁琐的操作一般都会相应的增加风险. 8.0.16的发布也带来一个新的功能-MGR通信协议的支持,可以让我们更轻松地切换到8.0,或者轻松地再切换回5.7.那么什么是MGR通信协议呢? MGR通信协议(The Communication Protocol I…

我在本机安装了DB2 9.5. 使用java jdbc连接,一直没有问题. QC for db2 连接 也一直没有问题. 突然有一天 Java程序连接 报错: A communication error has been detected. Communication protocol being used: Reply.fill(). Communication API being used: InputStream.read(). Location where the error was d…

Serial [Communication] Description Used for communication between the Arduino board and a computer or other devices. All Arduino boards have at least one serial port (also known as a UART or USART), and some have several. Board USB CDC name Serial pi…

https://developer.valvesoftware.com/wiki/Latency_Compensating_Methods_in_Client/Server_In-game_Protocol_Design_and_Optimization Overview Designing first-person action games for Internet play is a challenging process. Having robust on-line gameplay in…

http://www.fastfieros.com/tech/vpw_communication_protocol.htm Breakdown of the j1850 3 byte Header format Byte1 = priority Bits 7,6 and 5 are priority 0=High, 7=Low Bit 4 is header style (0=3 byte header-GM, 1=1 byte header-??) Bit 3 is In Frame Resp…