GE Power Management LPS-O Line Protection System 1-
17
1 PRODUCT DESCRIPTION 1.6 COMMUNICATIONS
1
1.6 COMMUNICATIONS 1.6.1 KEYPAD AND DISPLAY
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 8.1.20: CHANGE PASSWORD on page 8–17
for a description of the keypad password usage.
1.6.2 SERIAL COMMUNICATIONS
Three serial communications ports are standard on the LPS-O. A DB-9 plug RS232 port (Port 1) located on the
front panel of the unit provides local serial communication with the LPS-O via an IBM PC-compatible computer.
Two rear ports are provided for RS232 or RS485 serial communications. When Port 2 is configured as RS232,
connection is made using a DB25 plug; when Port 2 is configured as RS485, connection is made using a 4-pin
Phoenix plug. Port 3 uses a DB25 plug for either RS232 or RS485 communications. The communications pro-
tocol for each port may be selected independently as either GE-Modem or ASCII. Each port may be set inde-
pendently 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-O 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 Section 11.7.4: CHANGE PASSWORD on page 11–21 for a description of using LPSO-Link to change
passwords.
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