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1.6 COMMUNICATIONS
1.6 COMMUNICATIONS
1
A local user interface, incorporating a keypad and liquid crystal display (LCD), is provided to enter settings, dis-
play present values, view fault target information, and access stored data. This feature is fully described in
Chapter 8: LOCAL USER INTERFACE.
Passwords provide security for the local user interface (keypad). Three different passwords provide local key-
pad security against inadvertent breaker operations and settings changes. No password is required to view
data stored in the relay. The three levels of password protection are:
•
CONTROL: Allows control operations (trip and close the breakers).
•
SETTINGS: Allows settings changes.
•
MASTER: Allows both control operations and settings changes.
Refer to Section 8.1.22: ENABLE/DISABLE PASSWORDS on page 8–18 for a description of the keypad pass-
word usage.
Two serial communications ports are standard, and a third is optional. A DB-9 plug RS232 port (Port 1) located
on the front panel of the unit provides local serial communication with the LPS-D via an IBM PC-compatible
computer. One or two rear ports are provided for serial communications is either RS232 or RS485. Port 2 is
standard on all LPS-D models. When Port 2 is configured as an RS232 port, connection is made using a DB25
plug; when Port 2 is configured as an RS485, connection is made using a 4-pin Phoenix plug. Port 3 is optional
and uses a DB25 plug for either RS232 or RS485. The communications protocol for each port may be selected
independently as either GE-Modem or ASCII. Each port may be set independently for data communications
from 300 to 19200 bps. In addition, Port 3 has the ability to accept a plug in communication module that can
support other communications protocols.
Four different passwords provide remote serial communications security. The four levels of password protec-
tion are:
•
VIEW: Allows remote access to the LPS-D to view and retrieve stored data.
•
CONTROL: Allows control operations (trip and close the breakers).
•
SETTINGS: Allows settings changes.
•
MASTER: Allows both control operations and settings changes.
Refer to Chapter 11: ALPS-LINK USER GUIDE for a description of ALPS-Link and ASCII port password usage.
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LPS-D Line Protection System
1 PRODUCT DESCRIPTION
1.6.1 KEYPAD AND DISPLAY
1.6.2 SERIAL COMMUNICATIONS
GE Power Management
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