U.4.10
SEL-421/SEL-421-1 Relay
User’s Guide
Date Code 20020501
Basic Relay Operations
Changing the Default Passwords
Higher Access Level Commands
Use the commands in
to enter access levels above
Access Level 1. For example, use the
2ACCESS
(2AC)
command to change
to Access Level 2. If you are presently at Access Level 1, B, P, A, or O, typing
2AC <Enter>
causes the SEL-421 Relay to prompt you to type the Access
Level 2 password. If the present level is Access Level 0, the SEL-421 Relay
responds with “Invalid Access Level.” The relay asserts alarm Relay Word bit
SALARM when entering Access Level B, P, A, O, and 2 from a lower access
level.
If you are unable to enter the correct password after the third failed attempt,
the SEL-421 Relay asserts the SALARM Relay Word bit and displays on a
communications terminal screen the error message “WARNING: ACCESS
BY UNAUTHORIZED PERSONS STRICTLY PROHIBITED.” In addition,
you cannot make further access level entry attempts for 30 seconds. The relay
terminates the communications connection after the third failed attempt when
you use Ethernet via an SEL-2701 Ethernet Processor, DNP (Distributed
Network Protocol), and M
IRRORED
B
ITS™
communications virtual terminal
mode. For more information on these protocols, see
Communications in the Reference Manual
and
Communications Protocols in the Reference Manual
.
If your connection to the SEL-421 Relay has an inactivity time-out (in the
SET P
port settings), the SEL-421 Relay automatically closes the
communications connection and changes to Access Level 0 when the time-out
occurs.
Passwords
Valid passwords are character sequences of as many as six characters. Valid
password characters are numbers, upper- and lower-case alphabetic
characters, “.” (period), and “-” (hyphen). Passwords are case-sensitive. Use
strong passwords. These contain a mix of the valid password characters in a
combination that does not spell common words in any portion of the
password.
Changing the Default Passwords: Terminal
Step 1. Confirm that the relay is operating. See
Step 2. Establish communication with the SEL-421 Relay. See
an EIA-232 Serial Port Connection on page 4.6
to learn how to
use a terminal to communicate with the relay.
Step 3. Prepare to control the relay at Access Level 2. Using a
communications terminal, type
ACC<Enter>.
Type the Access
Level 1 password OTTER and press
<Enter>
. You will see the
=> action prompt. Type
2AC<Enter>
. At the password
prompt, type
TAIL<Enter>
. You will see the =>> action
prompt.
Step 4. View the list of access levels and passwords. Type
PAS<Enter>
. For a new relay, you will see a terminal screen
similar to
. (Text that you type is emphasized in bold
letters.)
WARNING:
This device is
shipped with default passwords.
Default passwords should be
changed to private passwords at
installation. Failure to change each
default password to a private
password may allow unauthorized
access. SEL shall not be responsible
for any damage resulting from
unauthorized access.
!
NOTE:
Passwords are case sensitive;
you must enter passwords exactly as
set.
Summary of Contents for SEL-421
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