7.11
Date Code 20081022
Instruction Manual
SEL-787 Relay
Communications
SEL ASCII Protocol and Commands
Access Levels
Commands can be issued to the SEL-787 via the serial port to view metering
values, change relay settings, etc. The available serial port commands are
listed in the
These commands can be accessed only from the corresponding access level,
as shown in the
. The access levels are:
➤
Access Level 0 (the lowest access level)
➤
Access Level 1
➤
Access Level 2 (the highest access level)
Access Level 0
Once serial port communication is established with the SEL-787, the relay
sends the following prompt:
=
This is referred to as Access Level 0. Only a few commands are available at
Access Level 0. One is the
ACC
at the end of this manual. Enter the
ACC
command at the Access
Level 0 prompt:
=
ACC <Enter>
The
ACC
command takes the SEL-787 to Access Level 1. See
Commands (ACCESS and 2ACCESS) on page 7.13
for more detail.
Access Level 1
When the SEL-787 is in Access Level 1, the relay sends the following prompt:
=>
See the
at the end of this manual for the
commands available from Access Level 1. The relay can go to Access Level 2
from this level.
The
2AC
command places the relay in Access Level 2. See
for more detail. Enter the
2AC
command at the
Access Level 1 prompt:
=>
2AC <Enter>
Table 7.4
Serial Port Automatic Messages
Condition
Description
Power Up
The relay sends a message containing the present date and
time, Relay and Terminal Identifiers, and the Access Level 0
prompt when the relay is turned on.
Event Trigger
The relay sends an event summary each time an event report
is triggered. See
.
Self-Test Warning or
Failure
The SEL-787 sends a status report each time a self-test
warning or failure condition is detected. See
Command (Relay Self-Test Status) on page 7.34
.
Summary of Contents for SEL-787
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