单片机与VB的串行通信程序-SCM and VB serial communication program

实现VB和松下PLC通信 单独读写1位 "X" "Y" "R" "C" "T" 一次读写多个不同类型的位 "X" "Y" "R" "C" "T" 一次读写多个数据 "WX" "WY" "WR" "WL" "DT" "FL" "LD" "SV" "EV" -Panasonic VB and PLC communication to achieve a separate read and write an " X" " Y" " R"