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。...

通过串口实现PC机和下位机的通信，用VB。NET来实现-through the PC serial port and the next crew of communications, using VB.NET to achieve

用于在线仪表的 modbus,仅供参考，-online instrument for modbus connection, for information purposes only, thank you

VCL控件，功能强大，包括串口，Moden，传真-VCL control, powerful, including serial, Moden, fax, etc.

a minimal microcontroller based project to establish a communication on the serial port

modbus source code with pic 16 and max 232

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

利用西门子的GSM芯片（TC35）的手机模块实现短信的读写，该手机模块可以加入SIM卡，然后就跟手机一样使用了，程序可以通过串口进行控制-The programme use GSM CMOS chip(TC35) module to read and write short message, you can insert SIM card into this module, then it can work as ordinary Mobile phone,the programme can control the module through com port.

采用win32API用C++BUILDER实现的串口通信，可实现与一般通信设备的AT命令交互- Uses win32API with C the BUILDER realization string mouth correspondence, may realize and the general communication facility AT order alternately

串口通讯开发文档资料，四个word文档，详细描述如何串口开发-VC_COMM content

将串口通讯协议存储为一个通讯文件，可是随时将存储通讯协议文件调入计算机运行与下位机通讯可以实现通讯对话，-Serial communication protocol will be stored as a communications document, but to keep the communication protocol storage document transferred to the computer is running and the next-bit machine communication can realize communication dialogue