C++ Builder using RS232 interface for data transmission, a detailed process to achieve the purpose of the study (which can be completed through the sample program to test NULL)

RS232 Communication
...................\01 TX&RX
...................\........\01 SendData
...................\........\...........\Communication.bpr
...................\........\...........\Communication.cpp
...................\........\...........\Communication.dfm
...................\........\...........\Communication.drc
...................\........\...........\Communication.exe
...................\........\...........\Communication.obj
...................\........\...........\Communication.res
...................\........\...........\Communication.tds
...................\........\...........\Main.cpp
...................\........\...........\Main.ddp
...................\........\...........\Main.dfm
...................\........\...........\Main.h
...................\........\...........\Main.obj
...................\........\...........\RS232.cpp
...................\........\...........\RS232.h
...................\........\...........\RS232.obj
...................\........\02 Timer
...................\........\........\Communication.bpr
...................\........\........\Communication.cpp
...................\........\........\Communication.dfm
...................\........\........\Communication.drc
...................\........\........\Communication.exe
...................\........\........\Communication.obj
...................\........\........\Communication.res
...................\........\........\Communication.tds
...................\........\........\Main.cpp
...................\........\........\Main.ddp
...................\........\........\Main.dfm
...................\........\........\Main.h
...................\........\........\Main.obj
...................\........\........\RS232.cpp
...................\........\........\RS232.h
...................\........\........\RS232.obj
...................\02 ListBox
...................\..........\01 5Byte Length
...................\..........\...............\Communication.bpr
...................\..........\...............\Communication.cpp
...................\..........\...............\Communication.dfm
...................\..........\...............\Communication.drc
...................\..........\...............\Communication.exe
...................\..........\...............\Communication.obj
...................\..........\...............\Communication.res
...................\..........\...............\Communication.tds
...................\..........\...............\Main.cpp
...................\..........\...............\Main.ddp
...................\..........\...............\Main.dfm
...................\..........\...............\Main.h
...................\..........\...............\Main.obj
...................\..........\...............\RS232.cpp
...................\..........\...............\RS232.h
...................\..........\...............\RS232.obj
...................\..........\02 Varible Length
...................\..........\.................\Communication.bpr
...................\..........\.................\Communication.cpp
...................\..........\.................\Communication.dfm
...................\..........\.................\Communication.drc
...................\..........\.................\Communication.exe
...................\..........\.................\Communication.obj
...................\..........\.................\Communication.res
...................\..........\.................\Communication.tds
...................\..........\.................\Main.cpp
...................\..........\.................\Main.ddp
...................\..........\.................\Main.dfm
...................\..........\.................\Main.h
...................\..........\.................\Main.obj
...................\..........\.................\RS232.cpp
...................\..........\.................\RS232.h
...................\..........\.................\RS232.obj
...................\03 Touch Panel
...................\..............\01 OnlyVender
...................\..............\.............\Communication.bpr
...................\..........

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