This a use of HDLC protocol to the serial communication procedures source, was useful and interesting friends can discuss!

HDLC_serial
...........\CESHI.CPP
...........\ceshi.cpp.BAK
...........\CESHI.DFM
...........\CESHI.H
...........\CESHI.OBJ
...........\CESHI.~CP
...........\ceshi.~cpp
...........\CESHI.~DF
...........\ceshi.~dfm
...........\CESHI.~H
...........\HDLCTEST.CPP
...........\hdlctest.cpp.BAK
...........\HDLCTEST.DFM
...........\HDLCTEST.H
...........\HDLCTEST.OBJ
...........\HDLCTEST.~CP
...........\HDLCTEST.~DF
...........\HDLCTEST.~H
...........\hdlctestp.bpr
...........\hdlctestp.cpp
...........\hdlctestp.exe
...........\hdlctestp.res
...........\hdlctestp.tds
...........\hdlctestp.~bp
...........\hdlctestp.~bpr
...........\hdlctestp.~cp

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