7.4.2.5 Assigning of a serial communication protocol to a COM serial portThe settings of the serial communication protocol instance include a settingparameter, called either Port or Serial port, which is used to select the COM1 orCOM2 setting.Since not all serial protocol standards allow changes in linkparameters, all link setting parameters are not found in the COMnsettings. Additional link setting parameters are found in the settingparameter list of the used serial protocol.7.4.2.6 Serial link diagnostics and monitoringSerial communication diagnostics and monitoring is divided between the serial linkdriver and the serial communication protocol. The lower-level physical and protocol-independent aspects of the UART-based serial communication are monitored in theserial link driver. Diagnostic counters and monitoring values are located on the HMIunder Monitoring/Communication/COMn (n= 1,2,…).Depending on the communication protocol, the serial driver software receives singlecharacters or complete protocol frames, based on the frame start/stop characters or onlink frame timing.Table 19:Setting parametersParameter DescriptionFiber mode Defines the fiber-optic mode used. Setting "Nofiber" is the same as galvanic mode.Serial mode Used for galvanic RS-485 modes 2- or 4-wire. Thissetting is relevant only ifFiber mode is set to "Nofiber".Baudrate Communication speed usedSection 7 1MRS759118 ACommissioning108 REX640Operation Manual
