和MODEM通讯,VB

通讯视频语音,聊天,vc,csocket类,udp连接-Communications video voice, chat, vc, csocket category, udp connections

直接通过DLL实现端口读写操作的mex程序-directly through DLL and write ports of mex procedures

自己做的CSMA/CD的协议，花了好久，以前出错，在网上找了很多次，都没有贴出来的，这个是我根据库里面的例子做的，给大家做参考。

wap开发品台产品 手机变成年升毫 很好用的-development WAP phones goods into Taiwan products, or the good cents

手机PDA程序设计入门-整合型开发工具 爱书吧www.ibook8.com 我为人人>>==

USB总线接口芯片CH375的介绍，对于进行USB开发的人都很大的指导作用。-USB bus interface chip CH375 introduction to USB development for people a lot of the guiding role.

CPP Data structure heap queue structure -CPP Data structure heap queue structure

用于Window Mobile读图像文件-For Window Mobile Reading Image File

移动通信基本知识:从通信网的角度看，移动网可以看成是有线通信网的延伸，它由无线和有线两部分组成。无线部分提供用户终端的接入，利用有限的频率资源在空中可靠地传送话音和数据；有线部分完成网络功能，包括交换、用户管理、漫游、鉴权等，构成公众陆地移动通信网PLMN。从陆地移动通信的具体实现形式来分主要有模拟移动通信和数字移动通信这两部种。-Basic knowledge of mobile communications: From the perspective of communication networks, mobile networks can be seen as an extension of wired communication network, which is both wireless and wired components. Part of user terminals to provide wireless access, frequency of use of limited resources in the air and reliable transmission of voice and data wired part of the completion of network functions, including switching, subscriber management, roaming, authentication and so on, constitute a public land mobile communication network PLMN. From land-based mobile communications to the specific forms of the main points have analog and digital mobile communications that two kinds of mobile communication.

上位机做客户端，来读取下位机设备的数据。其中通讯协议是基于modbus的TCP/IP协议，用socket套接字来实现数据的传输。