这是我做的关于考勤机的一些测试程序，请大家积极下载，很有帮助。...

通过xml实现各种pda的通信（借助pc）-through xml realize pda communications (using pc)

实现数据链路层 串口间的通讯，可以调试网络间的简单连接-Data link layer communication between serial port, you can debug a simple connection between networks

dephi实现RS232串口通信。本程序需要一根RS232串口线连接两个串口实现。本程序包括两个部分：发送端和接收端，分别打开两个文件夹里名为SerialPortCom.exe的程序，在发送端输入数据，然后就可以在接收端看到发送端输入的数据。-dephi achieve RS232 serial communication. This process requires an RS232 serial link two Serial Port. This program consists of two parts : the sender and the receiver, respectively, opened two folder called SerialPortCom.exe procedures, the transmitter input data and then on the receiving end can see the transmitter input.

USB2.0标准协议,是嵌入式系统工程师必备通信协议-USB2.0 standard protocols, embedded systems engineer is required communication protocol

串口通信软件,在上位机上很好用,方便上位机监控-uart vC++ uart vC++uart vC++uart vC++ uart vC++uart vC++

这是一个用C编写的串口通信程序,可以用于嵌入式应用-This is a preparation of the C serial communication program, which can be used for embedded applications

使用Delphi编写的串口通信控制器，具备文件传输功能-prepared by the use of Delphi serial communication controller with the file transfer function

485通讯是工业现场用的很广泛的通讯方式，现在仍然在应用-485 communications industry is the scene of extensive means of communication, still in the application

用BCB写的spcomm的一个例子，收发数据功能-used to write the BCB spcomm an example, send data capabilities

电子书：《vc++ Turbo C 串口通信编程实践》，书中有源码实例，非常实用。-electronic books : "vc Turbo C serial communication programming practice," a source book examples, very practical.