基于vb的西门子plc和上位机通信的实现方法 拷贝就行

从串口读取数据，有两种方法， 1、每接收一个EV_RXCHAR,就用ReadFile读一次，这样我觉得太恐怖了。 2、接收到一个EV_RXCHAR后，等一定数据量的CPU周期(GetTickCount),再一次性读取缓冲区里的数据。这样做，一般情况下不会有问题，但是，如果数据很多，过了“一定数据量的CPU周期”，还没收完数据怎么办？就会少读数据了。 我用三个线程序来完成串口数据的-read data from the serial port, there are two methods, one, each receiving a EV_RXCHAR, on the ReadFile read, I think this vote. 2, received a EV_RXCHAR after a certain volume of data, such as CPU cycles (GetTickCount), and the one-time reader, the data buffer. To do so, under normal circumstances there is no problem, but if many of the data, and after a "certain amount of data the CPU cycles," also confiscated End Data how do? Few will read the data. I used three lines to complete serial data

实现了一个简洁易用的多线程串行通讯接口,可以切换查询和自动接收模式,进行对串口数据收发 -Realize a simple and easy-to-use multi-threaded serial communication interface, you can switch query and automatically receive mode and proceed to the serial data transceiver

moden串口编程（涉及AT指令，通用异步接收发器UART）-moden Serial Programming (involving AT command universal asynchronous receiver transmitters UART)

在实验室用过的通信程序，用的是奇偶校验，请大家指教-used in laboratory procedures for communication with the parity, please enlighten

atmel dataflash driver

电子警察拍照管理系统，简单易用，源码开放，可以自己扩充方便。-electronic management system, easy to use, open source can facilitate their expansion.

这是本人在网上下载的关于深入浅出VC++串口编程之基于Win32 API的教程-This is my downloading on the plain language VC++ Serial programming based on the Win32 API tutorial

是关于山特电源通信规约的串口通信程序，功能是把电源监控器的采集数据上送到规约前置机中。-GOLD comunication rule

串口程序，使用vc编写，好东西，大家可以分享一下。-Serial procedures, the use of vc preparation, good things, we can share.

chch串口程序-ch ch Serial procedures