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7.17
Date Code 20100129
Instruction Manual
SEL-751A Relay
Communications
SEL ASCII Protocol and Commands
Command
Explanations
This section lists ASCII commands alphabetically. Commands, command
options, and command variables to enter are shown in bold. Lowercase italic
letters and words in a command represent command variables that are
determined based on the application. For example, time
t
= 1 to 30 seconds,
remote bit number
n
= 01 to 32, and
level
.
Command options appear with brief explanations about the command
function. Refer to the references listed with the commands for more
information on the control function corresponding to the command or
examples of the control response to the command.
You can simplify the task of entering commands by shortening any ASCII
command to the first three characters; for example,
ACCESS
becomes
ACC
.
Always send a carriage return
<CR>
character or a carriage return character
followed by a line feed character
<CR><LF>
to command the control to
process the ASCII command. Usually, most terminals and terminal programs
interpret the Enter key as a
<CR>
. For example, to send the
ACCESS
command, type
ACC <Enter>
.
Tables in this section show the access level(s) where the command or
command option is active. Access levels in this device are Access Level 0,
Access Level 1, and Access Level 2.
Access Commands (ACCESS and 2ACCESS)
The
ACC
and
2AC
commands (see
) provide entry to the multiple
access levels. Different commands are available at the different access levels,
as shown in the
SEL-751A Relay Command Summary
at the end of this
manual. Commands
ACC
and
2AC
are explained together because they
operate similarly. See
for a discussion of placing
the relay in an access level.
Password Requirements
Passwords are required unless they are disabled. See
(Change Passwords) on page 7.33
for the list of default passwords and for
more information on changing and disabling passwords.
Access Level Attempt (Password Required).
Assume the following
conditions:
➤
Access Level 1 password is not disabled.
➤
Access Level is 0.
At the Access Level 0 prompt, enter the
ACC
command:
=
ACC <Enter>
Table 7.6
Access Commands
Command
Description
Access Level
ACC
Moves from Access Level 0 to Access Level 1.
0
2AC
Moves from Access Level 1 to Access Level 2.
1
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