说明：  80c51和pc 机通过串行通信程序，电平转换用MAX232 (1)单片机端的数据传输程序 汇编或者c51 (2)pc机端的vb或者vc编写的通信程序 最好是vb (3) pc机 用的是com1 9针端口
(80c51 and machine through the serial communication pc procedures, level translators with MAX232 (1) single-chip end of the compilation of data or procedures c51 (2) pc-side preparation of vb or vc is the best communications program vb (3) pc plane using com1 9-pin port)