This is my learning Serial Programming from the next box, learning to believe that serial communications peer help. the procedure used TApdComPort. You can see from next box

Packet : 57578849seralport.rar filelist
SeralPort\about.dcu
SeralPort\commmain.dcu
SeralPort\CommWatch.dpr
SeralPort\CommWatch.INI
SeralPort\CommWatch.res
SeralPort\CommWatch.dof
SeralPort\CommWatch.cfg
SeralPort\CommWatch.exe
SeralPort\2ccc.com.txt
SeralPort\commmain.pas
SeralPort\commmain.~pas
SeralPort\commmain.dfm
SeralPort\commmain.~dfm
SeralPort\commmain.ddp
SeralPort\commmain.~ddp
SeralPort\about.pas
SeralPort\about.~pas
SeralPort\about.dfm
SeralPort\about.~dfm
SeralPort\about.ddp
SeralPort\about.~ddp
SeralPort\说明.txt
SeralPort

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Nothing．