检查串口是否联有modem

基于UDP和P2P打洞代码加有心跳包维持客户端存在，C/S模式，网络通信 

CAN_USB CAN_USB -CAN_USB CAN_USB CAN_USB

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扩频发射机，信道编码采用(2, 1, 7)卷积 码, 扩频模块采用扩频长度255 的kasami码, 极性变换模块为3bit 量化模式, 内插模块为每两比特间插入7bit 和输出滤波为16 阶的FIR 滤波器。-direct sequence spread spectrum transmitter

用VB实现电脑发送语音信息-VB computer to send voice messages

完整的短信管理系统.delphi实现.可以支持GSM大多数手机的短信收发,管理.-Complete message management system. Delphi realize. Can support the majority of GSM mobile phones to send and receive message, management.

CppReference 对于c/c++的详尽说明 C/C++ Reference General C/C++ Pre-processor commands Operator Precedence Escape Sequences ASCII Chart Data Types Keywords Standard C Library Standard C I/O Standard C String & Character Standard C Math Standard C Time & Date Standard C Memory Other standard C functions All C Functions C++ C++ I/O C++ Strings C++ String Streams Miscellaneous C++ C++ Standard Template Library C++ Algorithms C++ Vectors C++ Double-Ended Queues C++ Lists C++ Priority Queues C++ Queues C++ Stacks C++ Sets C++ Multisets C++ Maps C++ Multimaps C++ Bitsets Iterators All C++ Functions -CppReference for c/c++ Detailed C/C++ ReferenceGeneral C/C++ Pre-processor commands Operator Precedence Escape Sequences ASCII Chart Data Types Keywords Standard C LibraryStandard CI/O Standard C String

对E-OTD 数据的采集算法的描述，对DSP实现E-OTD 数据的采集很有帮助-of E-OTD data collection algorithm description, the DSP E-OTD data acquisition helpful

自动升级程序, 自动升级程序-Automatic escalation procedures, automatic escalation procedures

API串口读写模块 这是用VB编的通过API来对串口进行读写操作-API to read and write serial port using VB module which is made through the API to read and write serial port operation