unit1.pas

RS232串口通讯随书源码

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  TComm1, StdCtrls, ExtCtrls;

type
  TForm1 = class(TForm)
    rdCOM: TRadioGroup;
    Button4: TButton;
    Label1: TLabel;
    txtCmd: TEdit;
    Label2: TLabel;
    mReceive: TMemo;
    Button5: TButton;
    Button2: TButton;
    Comm1: TComm;
    procedure Button4Click(Sender: TObject);
    procedure Comm1ReceiveData(Sender: TObject);
    procedure Button5Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.Button4Click(Sender: TObject);
begin
  //确定使用的通信端口号码
  if rdCOM.ItemIndex =0 then
    Comm1.CommPort := pnCOM1
  else
    Comm1.CommPort := pnCOM2;
  //打开通信端口
  Comm1.PortOpen := True;
  Button5.Enabled := True;
end;

procedure TForm1.Comm1ReceiveData(Sender: TObject);
begin
  //接收数据于Memo中，并将光标移至最下方
  mReceive.Text := mReceive.Text + Comm1.Input ;
  mReceive.SelStart := Length(mReceive.Text);
  mReceive.SelLength := 0;
end;

procedure TForm1.Button5Click(Sender: TObject);
begin
  Comm1.OutputString(txtCmd.Text + Chr(13));
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
  Close;
end;

end.