我想用來取得讀卡機的資料 讀卡機驅動也都安裝完畢 卡片插入也會反應  但執行時都會出現 'Error opening serial port' 的錯誤訊息 
請問我已經有指定port給它了 Comm1.CommName:='COM1'; 為什麼還會出現錯誤? 請指教 謝謝
unit SPCommUnit;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls, SPComm;
type
TForm1 = class(TForm)
Comm1:TComm;
Memo1: TMemo;
Button1: TButton;
procedure FormCreate(Sender: TObject);
procedure FormClose(Sender: TObject; var Action: TCloseAction);
procedure Comm1ReceiveData(Sender: TObject; Buffer: Pointer;
BufferLength: Word);
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.FormCreate(Sender: TObject);
begin
Memo1.Clear; //清除螢幕
Comm1.CommName:='COM1';
Comm1.StartComm;
end;
procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);
begin
Comm1.StopComm;
end;
procedure TForm1.Comm1ReceiveData(Sender: TObject; Buffer: Pointer;
BufferLength: Word);
var S:string;
begin
SetLength(S,BufferLength); //接收RS232的數據並顯示Memo1上。
Move(Buffer^, PChar(S)^, BufferLength);
Memo1.Lines.Add(S);
Memo1.Invalidate;
end;
procedure TForm1.Button1Click(Sender: TObject);
var s:string;
begin
Comm1.WriteCommData(PChar(s),Length(s)); //送出指令給遠端
end;
end.

我發現是因為我已裝了讀卡機驅動的關西 才會如此