基于vb的西门子plc和上位机通信的实现方法 拷贝就行

使用vb.net实现串口通讯的过程，具体见程序。谢谢！-vb.net using Serial communication process, see the specific procedures. Thank you!

This program writes a lcd HyperTerminal and everything you type on your keyboard to pc, using codevisionavr.

串口短信通信收发软件,大家下下看看吧,不错的哇!-serial communications transceivers messaging software, we look at the Lower bar, a good wow!

电话计费管理系统,小交换机上的小软件,大家可以了解一下-telephone billing management system, a small switch on the small software, we can find out

自编的串口通信程序，支持一些简单命令-self serial communication program to support some simple orders

这是一个西门子 ModBus 协议的通讯调试软件。（原码）-This is a Siemens ModBus Protocol communications software debugging. (Original code)

关于RS-232 RS-485串口通信的详细资料-On the RS-232 RS-485 serial communication of detailed information

Visual Basic串口通信程序设计 mscomm.vbx通信控件可直接从vb的toolbox中加入窗体form，即可用其进行通信-Visual Basic serial communication program design mscomm.vbx directly Communication Control Vb from the toolbox window into form, can be used for communication

目录串口通信高级编程提供了一个能够进行串口通信的类，能够方便地进行各种数据通信。-Directory serial communication provides a high-level programming to carry out the type of serial communication, the ability to easily conduct various kinds of data communication.

WL013开发板，串口通信详细例程，含软件流程框图，c源程序、asm源程序等!适合初学者学习！-WL013 development board, serial communication detailed routines, including software flow chart, c source. asm2 source, etc.! for beginners learning!