Некорректная кодировка при получении результата выполнения plink.exe

proc:=CreateProcess('plink.exe',pchar(params), nil,nil,false,NORMAL_PRIORITY_CLASS,nil,nil,startupinfo,processinfo);

function GetPlinkOutput(): string;
var
  SA: TSecurityAttributes;
  SI: TStartupInfo;
  PI: TProcessInformation;
  StdOutPipeRead, StdOutPipeWrite: THandle;
  WasOK: Boolean;
  Buffer: array[0..255] of AnsiChar;
  BytesRead: Cardinal;
  WorkDir: string;
  Handle: Boolean;
begin
  Result := '';
  with SA do begin
    nLength := SizeOf(SA);
    bInheritHandle := True;
    lpSecurityDescriptor := nil;
  end;
  CreatePipe(StdOutPipeRead, StdOutPipeWrite, @SA, 0);
  try
    with SI do
    begin
      FillChar(SI, SizeOf(SI), 0);
      cb := SizeOf(SI);
      dwFlags := STARTF_USESHOWWINDOW or STARTF_USESTDHANDLES;
      wShowWindow := SW_HIDE;
      hStdInput := GetStdHandle(STD_INPUT_HANDLE);
      hStdOutput := StdOutPipeWrite;
      hStdError := StdOutPipeWrite;
    end;
    Handle := CreateProcess('plink.exe',pchar(params), nil,nil,true,0,nil,nil,SI,PI);
    CloseHandle(StdOutPipeWrite);
    if Handle then
      try
        repeat
          WasOK := ReadFile(StdOutPipeRead, Buffer, 255, BytesRead, nil);
          if BytesRead > 0 then
          begin
            Buffer[BytesRead] := #0;
            Result := Result + Buffer;
          end;
        until not WasOK or (BytesRead = 0);
        WaitForSingleObject(PI.hProcess, INFINITE);
      finally
        CloseHandle(PI.hThread);
        CloseHandle(PI.hProcess);
      end;
  finally
    CloseHandle(StdOutPipeRead);
  end;
end;

procedure TForm1.Button10Click(Sender: TObject);
begin
  params:=pchar('ssh -P 22 -l root -pw XXXXX '+IP+' tail -30 /opt/egais/transporter/l/transport_info.log');
  Memo1.Clear;
  memo1.Font.Name:='Console';
  memo1.Font.Size:=9;
  memo1.Font.Charset:=OEM_CHARSET;
  memo1.Lines.Add(UTF8ToUnicodeString(GetPlinkOutput()));
end;