PC机与51单片机之间的串口通讯使用VB编程,上位机和下位机两部分-The two parts of the serial communication between the PC and 51 microcontroller, VB series, PC and microcontroller

VB与串行通信编程实例：单片机采用了51单片机，多机通信中采用了利SM2来区分是数据还是地址，效果还可以。其中RS485部分采用了隔离转换电路，采用高速光耦6N137-VB and serial communication programming examples: single-chip microcontroller with a 51, multi-machine communication using Lee SM2 to distinguish the data or address,

51系列单片机的串行口通讯样例程序,基于KEIL编写,里面有详细说明()