GTWIN Reference Manual 4.5 System Setting Menu97Field Descriptionsettings is transmitted to the RS232C device from the GT. Inthis mode, the GT does not reply to the command from theconnected RS232C device so execution time is shorter. Two-way 2The RS232C device connected to the GT sends a controlcommand to the GT. Data such as switch operations and datasettings is transmitted to the RS232C device from the GT. Inthis mode the GT replies to the command from the connectedRS232C device so execution time is longer. However, datatransfer is more secure as a result of confirmation or errormessages.Basic Communication Area to PLCMake sure that your PLC does not use the word or bit areas, i.e. addresses assigned under"Basic Communication Area to PLC", for any other purpose!Basic Communication Area MapThe following table provides a more detailed explanation for the bit areas for the various GTmodels.