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// 1. Messwertanforderung, der Timer steht z.B. auf 100 ms:

procedure TForm1.Timer1Timer(Sender: TObject);
begin
  ApdComPort1.OutPut := #2'0001'#3; // Anforderungsstring = funktioniert immer, auch wenn keine Rückmeldung mehr kommt.
end;

// 2. Empfang der Daten:

procedure TForm1.ApdDataPacket1StringPacket(Sender: TObject; Data: String);
  var
  HS
      : String;
begin
  HS := Data;
  HS := copy(HS , 2, 9);
  Form1.Label1.Caption := HS;
end;					

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while ApdComPort1.CharReady do
  Buffer := Buffer + ApdComPort1.Getchar;					

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ApdComPort.FlushInBuffer;
ApdComPort.FlushOutBuffer;					

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unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs;

type
  TApdComPort = class(TObject)
  public
    function CharReady: Boolean;
    function GetChar: Char;
  end;

  TComListener = class(TThread)
  private
    FApdComPort: TApdComPort;
    FBuffer: String;
    FOnReceive: TNotifyEvent;
  protected
    procedure DoNotify;
  public
    constructor Create(AApdComPort: TApdComPort; const AOnReceive: TNotifyEvent = NIL);
    procedure Execute; override;
    property OnReceive: TNotifyEvent read FOnReceive write FOnReceive;
    property Buffer: String read FBuffer;
  end;

  TForm1 = class(TForm)
    procedure FormCreate(Sender: TObject);
    procedure ComReceive(Sender: TObject);
    procedure FormDestroy(Sender: TObject);
  private
    { Private-Deklarationen }
  public
    ApdComPort1: TApdComPort;
    ComListener: TComListener;
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

{ TComListener }

constructor TComListener.Create;
begin
  inherited Create(FALSE);
  FreeOnTerminate := TRUE;
  FApdComPort := AApdComPort;
  FOnReceive := AOnReceive;
end;

procedure TComListener.Execute;
begin
  while NOT Terminated do begin
    FBuffer := '';
    while FApdComPort.CharReady do
      FBuffer := FBuffer + FApdComPort.Getchar;
    if (FBuffer <> '') then begin
      if Assigned(FOnReceive) then
        Synchronize(DoNotify);
    end
    else
      Sleep(10); // 10ms Pause
  end;
end;

procedure TComListener.DoNotify;
begin
  FOnReceive(Self);
end;

{ TApdComPort }

function TApdComPort.CharReady: Boolean;
begin
  Result := False;
end;

function TApdComPort.GetChar: Char;
begin
  Result := #0;
end;

{ TForm1 }

procedure TForm1.FormCreate(Sender: TObject);
begin
  ApdComPort1 := TApdComPort.Create;
  ComListener := TComListener.Create(ApdComPort1,ComReceive);
end;

procedure TForm1.ComReceive(Sender: TObject);
begin
  ShowMessage((Sender as TComListener).Buffer);
end;

procedure TForm1.FormDestroy(Sender: TObject);
begin
  ComListener.Terminate;
  ApdComPort1.Free;
end;

end.