DNP3 serial can be assigned to a serial communication port in the protection relay. Serial communication ports are named COM1...COMn, depending on how many serial ports the protection relay hosts.
DNP3 protocol ignores any parity setting in the COM settings group. DNP3 is defined as an 8 bit/no parity protocol with a 16-bit CRC every 16 bytes. These characteristics are automatically configured by the protection relay's software when a serial port is taken into use by DNP3. However, some characteristics of the serial port must be set: baud rate, serial mode (RS-232, RS-485 2/4-wire) and fiber mode. They are located in the serial port settings.
Note: For the serial port parameter settings and hardware setup, see the technical manual.
Note: The COM port connection type, optical ST or EIA-485 connection, star or loop topology, idle state (light on or light off) and the bias and bus termination are selected with the COM port jumpers.