7.11
Date Code 20170601 Instruction Manual SEL-387-0, -5, -6 Relay
Serial Port Communications and Commands
SEL ASCII Protocol Details
➤ RID and TID settings for the active group
➤ Date and time the event was triggered
➤ The event type
➤ Target information
➤ Phase currents for all four windings
Access Levels
Commands can be issued to the relay via the serial port to view metering
values, change relay settings, etc. The available ASCII serial port commands
are listed in Figure 7.2, and summarized by level in the SEL-387 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) on page 7.22. Below are the access
level hierarchy, the access level prompts, and commands allowed in each of
the four access levels:
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
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 (see Figure 7.2. Enter the ACC command at the Access Level
0 prompt to go to Access Level 1.
Access Level 1
After issuing the ACC command and entering the password, if it is required
[see PAS (Passwords) on page 7.22 for default factory passwords], the relay is
in Access Level 1. The prompt for Access Level 1 appears (
=>).
Access Level Prompt Commands Allowed
0 (lowest)
=
0
1
=>
0, 1
B
==>
0, B
2
=>>
0, 1, B, 2
C (highest)
==>>
0, 1, B, 2, C
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