本文整理自网络，侵删。
Spcomm串口控件的例程
//串口初始化
procedureTForm1.BitBtn3Click(Sender: TObject);
begin
comm1.startcomm;
end;
//关闭串口
procedureTForm1.BitBtn4Click(Sender: TObject);
begin
comm1.StopComm;
end;
//发送数据
procedureTForm1.BitBtn1Click(Sender: TObject);{var str:string;ch1:char;}
begin
comm1.WriteCommData(ch,1);
end.
//接收数据
procedureTForm1.Comm1ReceiveData(Sender: TObject; Buffer: Pointer;BufferLength: Word);
type ss=array[1..500]of char ;
var str1:^ss;
i:integer;
s:array[0..15] ofchar ;
n:integer;
begin
str1:=Buffer;
//s[]=('0','1','2','3'...'E')
for i:=0 to 9 do
s[i]:=chr(48+i);
for i:=10 to 15do
s[i]:=chr(55+i);
for i:=1 tobufferlength do
begin
n:=ord(str1^[i]);
listbox1.Items.add(inttostr(listbox1.Items.Count+1)+'- '+s[n div 16]+s[n mod 16]);
end;
listbox1.Refresh;
iflistbox1.Items.count > strtoint(form2.edit1.text)
thenlistbox1.Items.Clear;
end;
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