用TC对计算机的串口进行编程，并作一个简单的串口查询通讯程序。用一条九针的DB-9串口通讯线将计算机的com1口和com2口相连，com1作为接受口，com2作为发送口。-with TC on the serial port of computer programming, and for a simple serial communication program inquiries. Using a 9-pin DB-9 serial communication lines to the co

vb 西门子S300PLC通讯程序,可以实现对DB数据区的读写等功能 -vb Siemens S300PLC communication procedures, can achieve read and write data area of the DB features such as

将利用API函数开发了一个串口通信程序，在开发之前需要对计算机中的DB-9连接线头进行跳线- Will have developed a serial port signal procedure using the API function, before development needs to carry on to computer s DB-9 connection end jumps the line

利用vb 6.0 开发分贝的采集，使用串口通信。RS232协议。并把采集的数据绘制成图形显示出来。-Developed using vb 6.0 dB collection, use serial communication. RS232 protocol. And the data collected into a graphic display drawing.