unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, OleCtrls, MSCommLib_TLB, StdCtrls;

type
  TForm1 = class(TForm)
    Memo1: TMemo;
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    MSComm1: TMSComm;
    procedure Button1Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
    procedure MSComm1Comm(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
begin
MSCOMM1.PortOpen:=TRUE;
end;

procedure TForm1.Button3Click(Sender: TObject);
begin
MSCOMM1.PortOpen:=FALSE;
end;

procedure TForm1.MSComm1Comm(Sender: TObject);
begin
    case mscomm1.CommEvent of
     comevsend:
           begin
           end;
     comevreceive:
           begin
           end;
      end;
end;

end.