Rs232 Faceplate Port; Cpu Communication Ports - GE L90 Instruction Manual

3.2 WIRING
A 9-pin RS232C serial port is located on the L90 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.
NOTE
3
a) OPTIONS
In addition to the faceplate RS232 port, the L90 provides a rear RS485 communication port.
The CPU modules do not require a surge ground connection.
NOTE
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.
3-22
Figure 3–23: RS232 FACEPLATE PORT CONNECTION
Figure 3–24: CPU MODULE COMMUNICATIONS WIRING
L90 Line Current Differential System
3 HARDWARE

3.2.8 RS232 FACEPLATE PORT

3.2.9 CPU COMMUNICATION PORTS

GE Multilin