Modbus RTU sample DOC [PDF]

구글링으로 얻은 PDF

원 저작자님 감사 합니다.  ^^;

Modbus Sample Program(040427).PDF

modbus_protocal.pdf

 

응용한 프로그램 소스 중 일부

 - Cport 264 사용..
 - 온도 모니터링 하는데, 가끔 뻑난단다.. 콤포 문젠지 뭔지 감이 안잡힘....젠장.

procedure TfrmMain.ComTmpRxChar(Sender: TObject; Count: Integer);
var
  i:integer;
  RX_Char:char;//수신된 값
  RX_Array:array[1..200]of string;//수신된 데이타
  rx_s : string;
begin

  //ComPort1.Readstr(rx_s,count);
  //Edit_RX.Text := Edit_RX.Text + rx_s;

  //010304021600F81BCD
  for i:=1 to count do begin
    ComTmp.Read(RX_Char,1);
    RX_Array[i]:=inttohex(byte(RX_Char),2);
    RxBuf2:=RxBuf2+RX_Array[i];
  end;

  if (18 = length(RxBuf2)) and (RxBuf2[3] = '0') and (RxBuf2[4] = '4') then begin
    FlterTmp(RxBuf2);
    Edit_Rx.Text := RxBuf2;
    ComTmp.ClearBuffer(True,True);
    RxBuf2 := '';
    exit;
  end;

  if (10 = length(RxBuf2)) and ((RxBuf2[3] = '8') and (RxBuf2[4] = '1')) or ((RxBuf2[3] = '8') and (RxBuf2[4] = '4')) then begin
    FlterTmp(RxBuf2);
    Edit_Rx.Text := RxBuf2;
    ComTmp.ClearBuffer(True,True);
    RxBuf2 := '';
    exit;
  end;



end;

procedure TfrmMain.FlterTmp(tmpstr:string);
var
  i, j, iTag,k, tmparryMax, tmparryMin : integer;
  oStr, iCut1, iCut2, iCut3, iCut4 : string;
  Dcut1, Dcut2, Dcut3, Dcut4 : real;
begin

  tmrERRch.Enabled := False;

  oStr := tmpstr;

  if tmrMoni.Enabled = False then begin
    iTag := StrToInt(edtchNo.text);
  end else begin
    iTag := BtnTmpRead.Tag;
  end;

  if Length(oStr) < 18 then begin
    workD[iTag].iValue := 0;
    workD[iTag].iValue2 := 0;

    TEdit(FindComponent('EdtTemp_'+FormatFloat('00',iTag))).Text := 'ERR';//FormatFloat('0.0',Dcut1);
    TEdit(FindComponent('EdtHy_'+FormatFloat('00',iTag))).Text := 'ERR';//FormatFloat('0.0',Dcut2);

    LogADD('CH'+FormatFloat('00',iTag)+' ERROR '+ oStr);

    if tmrMoni.Enabled = False then begin
      exit;
    end;

  end else begin
    iCut1 := Copy(oStr,1,2); //ID

    iCut2 := Copy(oStr,7,4); //온도
    iCut3 := Copy(oStr,11,4); //습도


    Dcut2 := (StrToIntDef('$'+iCut2,0))/100;
    Dcut3 := (StrToIntDef('$'+iCut3,0))/100;

    workD[iTag].iValue := Dcut2;
    workD[iTag].iValue2 := Dcut3;

    TEdit(FindComponent('EdtTemp_'+FormatFloat('00',iTag))).Text := FormatFloat('0.0',Dcut2);
    TEdit(FindComponent('EdtHy_'+FormatFloat('00',iTag))).Text := FormatFloat('0.0',Dcut3);

    //LogADD('flterRTN');

  end;

  for i:=8 downto 1 do begin
    if workD[i].ichkuse then begin
      tmparryMax := i;
      break;
    end;
  end;

  for i:=1 to 8 do begin
    if workD[i].ichkuse then begin
      tmparryMin := i;
      break;
    end;
  end;

  BtnTmpRead.Tag := BtnTmpRead.Tag +1;

  if BtnTmpRead.Tag > tmparryMax then begin
    BtnTmpRead.Tag := tmparryMin;
    Measuring;
  end;




end;

procedure TfrmMain.BtnTmpReadClick(Sender: TObject);
var
  i,j, k:integer;
  CRC_Data_Len:integer;//CRC 계산에 사용될 데이타 길이
  CRC_Data_Array:array[1..30]of byte;//CRC 계산에 사용될 데이타
  Result_CRC:Word;//계산된 CRC값
  TX_Data_Size:integer;//송신할 데이타 길이
  TX_Data_Array:array[1..32]of byte;//송신할 데이타
  tmpstr : string;
  tmpchV, tmparryMax : integer;
begin

  tmrERRch.Enabled := True;

  for i:=8 downto 1 do begin
    if workD[i].ichkuse then begin
      tmparryMax := i;
      break;
    end;
  end;

  if tmrMoni.Enabled then begin
    for k := BtnTmpRead.Tag to tmparryMax do begin
      if workD[k].ichkuse then begin
        BtnTmpRead.Tag := k;
        Break;
      end;
    end;

    tmpchV := BtnTmpRead.Tag;

    edtchNo.Text := FormatFloat('00',tmpchV);
  end;

  edtchNo.Text := FormatFloat('00',strtoint(edtchNo.Text));

  Edit_Tx.Text := edtchNo.Text + '04' + '0000' + '0002';


  CRC_Data_Len:=round(length(Edit_TX.Text)/2);
  For i:=1 to CRC_Data_Len do begin
    j:=i*2-1;
    CRC_Data_Array[i]:=byte(strtoint('$'+Edit_TX.Text[j]+Edit_TX.Text[j+1]));
  end;

  Result_CRC:=Make_CRCValue(CRC_Data_Array,CRC_Data_Len);
  EdtCRC16.Text:= inttohex(Lo(Result_CRC),2)+inttohex(Hi(Result_CRC),2);


  if (ConfD.iSimulate = True) or (ComTmp.Connected = False) then exit;

  Edit_RX.Text:='';

  tmpstr := Edit_TX.Text + EdtCRC16.Text;

  TX_Data_Size:=round(length(tmpstr)/2);

  For i:=1 to TX_Data_Size do begin
    j:=i*2-1;
    TX_Data_Array[i]:=byte(strtoint('$'+tmpstr[j]+tmpstr[j+1]));
  end;

  ComTmp.Write(TX_Data_Array,TX_Data_Size);


end;

//Table에 의한 CRC값 생성 함수
function TfrmMain.Make_CRCvalue(Data: array of byte; nByte: word): Word;
var
  CRCValue:Word;
  i:integer;
begin
  CRCvalue:=$FFFF;
  For i := 1 to nByte do
    CRCvalue := Hi(CRCvalue) XOR CRC_Table[ Data[i-1] XOR Lo(CRCvalue) ];
  Result:=CRCvalue;
end;

procedure TfrmMain.btntmrstopClick(Sender: TObject);
begin
  tmrMoni.Enabled := not tmrMoni.Enabled;

  if tmrMoni.Enabled then begin
    btntmrstop.Caption := 'Auto Run.';
  end else begin
    btntmrstop.Caption := 'Manual Run.';
  end;
end;