Date Code 20020129
Serial Port Communications and Commands
7-11
SEL-387E Instruction Manual
by level in
Section 12: SEL-387E Relay Command Summary
. A multilevel password system
provides security against unauthorized access. This access scheme allows you to give personnel
access to only those functions they require.
The relay supports four access levels. Each level has an associated screen prompt and password.
The relay is shipped with the default factory passwords shown in the table under
PAS
(Passwords)
later in this section. Below are the access level hierarchy, the access level prompts,
and commands allowed in each of the four access levels:
Access
Level Prompt Commands
Allowed
0
(lowest)
=
0
1
=>
0,
1
B
==>
0,
B
2 (highest)
=>>
0, 1, B, 2
Figure 7.2 summarizes the access levels, prompts, and commands available from each access
level and commands for moving between access levels.
The relay responds with “Invalid Access Level” if a command is entered from an access level
lower than the specified access level for the command. The relay responds with “Invalid
Command” to commands not listed or if a command is not followed by the correct number or
letter.
Access Level 0
Once serial port communications are established with the relay, the Access Level 0 prompt (=)
appears. If a different prompt appears, the relay was left in a different access level or the
terminal emulation you are using is translating the characters differently. VT-100 emulation is
recommended.
The only commands that can be executed at Access Level 0 are the
ACC
and
QUI
commands
ACC
command at the Access Level 0 prompt to go to Access
Level 1.
Access Level 1
After you issue the
ACC
command and enter the password, if it is required [see
PAS
(Passwords)
for default factory passwords], the relay will be in Access Level 1. The prompt for
Access Level 1 appears (=>).
Many commands can be executed from Access Level 1 for viewing relay information. The
BAC
command allows the relay to go to Access Level B. The
2AC
command allows the relay to go to
Access Level 2.
Access Level B (Breaker Level)
After you issue the
BAC
command and enter the password, if it is required [see
PAS
(Passwords)
for default factory passwords], the relay pulses the ALARM contact and will be in
Access Level B (breaker access level). The Access Level B prompt appears (==>).
