/// <summary>
        /// move DUT away from test station
        /// </summary>
        /// server PC function
        /// <param name="stationID"></param>
        public void MoveDUTFromTester(string stationID, string testResult)
        {
            string message = null;

            stationID = CommonMethod.ChangeOneBitToTwoBit(stationID);
            message   = MainPLCMessage.MoveDUTFromStation + stationID + testResult;
            SendMessage(message);
            RobotPLCStatus.UpdateRobotPLCStatus("T" + stationID + " -> " + (testResult == "00" ? "OK" : "NG"));
        }
        /// <summary>
        /// move DUT to test station
        /// </summary>
        /// server PC function
        /// <param name="stationID"></param>
        public void MoveDUTtoTester(string stationID)
        {
            string message = null;

            stationID = CommonMethod.ChangeOneBitToTwoBit(stationID);
            message   = MainPLCMessage.MoveDUTToStation + stationID;
            SendMessage(message);
            RobotPLCStatus.UpdateRobotPLCStatus("Buf -> T" + stationID);
        }