GE Multilin D30 Line Distance Protection System 3-21
3 HARDWARE 3.2 WIRING
3
3.2.8 RS232 FACEPLATE PORT
A 9-pin RS232C serial port is located on the D30 faceplate for programming with a computer. All that is required to use this
interface is a computer running the EnerVista UR Setup software provided with the relay. Cabling for the RS232 port is
shown in the following figure for both 9-pin and 25-pin connectors.
The baud rate for this port is fixed at 19200 bps.
Figure 3–23: RS232 FACEPLATE PORT CONNECTION
3.2.9 CPU COMMUNICATION PORTS
a) OPTIONS
In addition to the faceplate RS232 port, the D30 provides a rear RS485 communication port.
The CPU modules do not require a surge ground connection.
Figure 3–24: CPU MODULE COMMUNICATIONS WIRING
b) RS485 PORTS
RS485 data transmission and reception are accomplished over a single twisted pair with transmit and receive data alternat-
ing over the same two wires. Through the use of the port, continuous monitoring and control from a remote computer,
SCADA system, or PLC is possible.
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