U.4.21
Date Code 20020501 User’s Guide SEL-421/SEL-421-1 Relay
Basic Relay Operations
Making Simple Settings Changes
Text-Edit Mode Line Editing
Some SEL-421 Relay settings present multiple input lines to your terminal;
you use basic line text editing commands to construct the setting. For display,
the relay references each line of the setting by line number, not by the setting
name. See Making Text-Edit Mode Settings Changes on page 4.21 for an
example of a text-edit mode setting.
While in the text-edit mode, you see a prompt consisting of the line number
and the present setting for that line. You can keep the setting, enter a new
setting, or delete the setting. Table 4.7 lists the commands for text-edit mode.
Use commas to separate the items in a text-edit mode setting when you are
entering multiple items per line. After you enter each line, the relay checks the
validity of the setting. If the entered setting is invalid, the relay responds with
an error message and prompts you again for the setting.
Making Text-Edit Mode Settings Changes
The procedure in the following steps familiarizes you with basic text-edit
mode line editing. You set Display Point 1 through Display Point 3 to show
the status of Circuit Breaker 1, Circuit Breaker 2, and the operational state (on
or off) of the transformer cooling fans near the circuit breaker bay where you
have installed the SEL-421 Relay. See Display Points on page U.5.6 in the
User’s Guide for information on programming display points.
For this example, use inputs IN101 through IN103. You can use other inputs
for your particular application. See Control Inputs on page U.2.6 in the User’s
Guide for more information on control inputs.
This procedure assumes that you have successfully established
communication with the relay; see Making an EIA-232 Serial Port
Connection on page 4.6 for a step-by-step procedure. In addition, you must be
Table 4.7 Actions at Text-Edit Mode Prompts
Action
a
a
In this table, the ¿ symbol represents the Enter key <Enter>.
Relay Response
¿ Accept the setting and move to the next line; if at the last line or at a
blank line, exit settings.
>n¿ Move to line n. If this is beyond the end of the list, move to a blank line
following the last line.
^¿ Move to the previous line; if at the first line, stay at the present line.
<¿ Move to the first line.
>¿ Move to a blank line following the last line.
LIST¿ List all settings and return to the present action prompt.
DELETE
[n]¿
Delete the present line and subsequent lines for a total of n lines; n=1 if
not provided. Lines after deletion shift upward by the number of lines
deleted.
INSERT¿ Insert a blank line at the present location; the present line and subsequent
lines shift downward.
END¿ Go to the end of the present settings session. Prepare to exit settings via
the “Save settings (Y,N) ?” prompt.
<Ctrl+X>
Abort editing session without saving changes.
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