使用MSCOMM控件主要是通过事件来处理串行口的交互，即当数据到达时，控件的OnComm的事件就会来捕获或处理这些通讯事件。而OnComm事件也可以用来捕获和处...

本串行通信程序利用汇编语言通过BIOS中断调用和DOS功能调用实现PC机双机串行通信。其中，上位机和下位机串行口均为辅串口COM2（口地址为2FXH），对外用9针连接器与令一台PC机连接；BIOS通过“INT 14H”4个中断服务子程序，分别完成串口初始化编程、发送一帧数据、接受一帧数据以及测试通信线状态。本程序分为PC机串口自动测试程序（目的是测试串口好坏）和PC机全双工双机通信程序两个部分。-the serial communications procedures through the use of assembly language BIOS interrupt calls and function calls DOS PC Dual Serial Communication. Among them, PC and the next crew will be supplemented by serial port Serial COM2 (I address 2FXH) external with 9-pin connectors and enable a PC connection; through the BIOS "INT 14H," four interrupt service routines, complete serial port initialization programming, Send a data receiving a data communications test and the state line. The procedures are divided into PC serial automatic test procedure (for the purpose of testing Serial good or bad) and full-duplex PC-machine communication program two parts.

51红外源代码，NEC代码格式，很精确的代码，请放心使用。-51 infrared source code

SPCE061A为核心的转换控制(Drivers汇编代码)：以太网 RS232-SPCE061A at the core of the change of control (Drivers assembly code): Ethernet RS232

这是我自己写的关于串口通讯的小程序,适于两台PC机之间通过(交叉串口线)串口通讯.可以(自动或手动)发送数据、接收数据、保存数据。是调试串口和初步学习串口编程的好例子。其中还用到了典型的串口类，对于从事串口编程者有一定的借鉴作用。 -that I write on small serial communication procedures, suitable for two between the PC (cross-Serial Line) serial communications. May (automatically or manually) to send data, receive data, the data is preserved. Serial debugging is a preliminary study and Serial Programming good example. It also uses the typical serial category, for those engaged in serial programming is useful role.

rs485通信协议的规定，定义了串行通信协议中传输的信息内容及使用格式，可以参考-rs485 communication protocol requirements, defines the serial communication protocol to transmit the information content and the use of format

一段源代码,希望能对初学者有所帮助,已调试通过.-Section of source code, hoping to be helpful for beginners have been debug through.

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

8583芯片编程应用写入器件地址写8574端口，写入器件地址读8574端口。-8583 Application Programming chip device addresses written into the 8574 port, write device address read 8,574 ports.

Advantech Driver Demo: Software Data Transfer

西门子S7-200PLC自由口协议Modbus主站库文件-Siemens S7-200PLC agreement free port Modbus master library file