A 9-pin RS232C serial port is located on the L90 faceplate for programming with a personal computer. All that is required to
use this interface is a personal 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.
In addition to the faceplate RS232 port, the L90 provides two additional communication ports or a managed six-port Ether-
net switch, depending on the installed CPU module.
The CPU modules do not require a surge ground connection.
Table 3–3: CPU MODULE COMMUNICATIONS
10Base-F and 10Base-T
Ethernet switch module with two 10/100Base-T and four 100Base-FX ports
Figure 3–23: RS232 FACEPLATE PORT CONNECTION
L90 Line Current Differential System
3.2.8 RS232 FACEPLATE PORT
3.2.9 CPU COMMUNICATION PORTS