Schweitzer Engineering Laboratories SEL-787 - Table 7.4 Serial Port Automatic Messages

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 SEL-787 Relay Command Summary at the end of this manual.
These commands can be accessed only from the corresponding access level,
as shown in the SEL-787 Relay Command Summary. 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 command. See the SEL-787 Relay Command
Summary 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 Access
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 SEL-787 Relay Command Summary 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 Access Commands
(ACCESS and 2ACCESS) 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 Section 9: Analyzing Events.
Self-Test Warning or
Failure
The SEL-787 sends a status report each time a self-test
warning or failure condition is detected. See STATUS
Command (Relay Self-Test Status) on page 7.34.