我见过最好的串口类

串口驱动程序，可替换NT下的串口驱动程序 (Serial dirver which can replace serial driver in NT)

linux下的串口通讯代码，方便修改以实现多种串口通讯功能(under linux serial communication code to facilitate modified to achieve a variety of serial communication functions)

使用vc++开发的云台镜头控制系统，主要通过串口实现控制，已编译通过，可学习使用(PTZ camera control system)

带ID的lpc2368 CAN通信，包括初始化、中端、CAN通信和串口通信(With the ID lpc2368 CAN communications, including initialization, in the end, CAN communications and serial communication)

用VB编写的FX系列PLC通信动态链接库,用户只需调用API函数就可以简单的实现串口通讯(VB prepared by the FX series PLC communication dynamic link library, Users only need to call API functions can be achieved by a simple serial communications)

这个程序是利用VC编写的一个从机串口响应modbus查询命令程序，实现RTU方式，3.5和1.5个字符时间检测，CRC和LRC校验。(This program is written using VC as a response from the machine serial modbus query command procedure, to achieve RTU mode, 3.5 and 1.5 characters time detection, CRC and LRC check.)

利用C语言实现RS232串口上下位机通信的设计(Using C language to realize RS232 serial port communication up and down a machine design )

C++串口通信代码，接收下位机的数据点，并在前面板画出图形。（数据格式* , , /）内附STM32串口发送数据程序(C++ serial communication code, receive under the data points, and the front panel to draw graphics. (Data format,*, /) containing STM32 serial transmit data program)

基于CC2540芯片的串口测试程序，是改别人的程序，很实用测试过,可供大家参考，程序架构调整过，很容易看懂。(Based on CC2540 chip serial test program, it is to change others program, very practical tested, for your reference, application architecture adjusted, it is easy to understand.)

vc++ 串口编程,用vc++编写上上位机程序 常见的几种方式以及注意事项均有介绍