本文描述的大致的下位MSC51单片机与上位PC机的串口通信原理，有一定的参考价值-This paper describes a substantially lower bit microcontroller with MSC51 host PC' s serial port communication theory, there is some reference value

vb的上位机和单片机的直接的通信-The PC and the microcontroller vb direct communication! ! ! ! !

串口转换和单片机通信的最佳工具,是单片机与PC通信测试最好工具-Best tool to convert and microcontroller serial communications, SCM and PC communications test is the best tool