In addition, RS-232 serial communication protocols and programs are described in detail in the paper, and serial communication between upper PC and slave SCM is achieved successfully by use of MSComm of ActiveX controls in Visual Basic 6.0.

• 另外；本文还详细编制了串口(RS-232)通信协议和通信程序；并运用Visual Basic 6.；0的ActiveX技术中的MSComm控件实现了上位机和下位机的串行通信。