Date Code 20171006 Instruction Manual SEL-400 Series Relays
Instruction ManualInstruction Manual
SECTION 14
ASCII Command Reference
You can use a communications terminal or terminal emulation program to set and
operate the relay. This section explains common SEL-400 series relay commands
that you send to the relay using SEL ASCII communications protocol. The relay
responds to commands such as settings, metering, and control operations.
Not every command listed in this section is supported by every SEL-400 series
relay. Additionally, some SEL-400 series relays support additional commands.
See the product-specific instruction manual to see what specific commands are
supported in that relay.
This section lists ASCII commands alphabetically. Commands, command
options, and command variables that you enter are shown in bold. Lowercase
italic letters and words in a command represent command variables that you
determine based on the application (for example, circuit breaker number n = 1 or 2,
remote bit number nn = 01–32, 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
relay function corresponding to the command or examples of the relay response
to the command.
You can simplify the task of entering commands by shortening any ASCII com-
mand 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 relay 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>. For more information on SEL ASCII protocol, including handshaking,
see Section 15: Communications Interfaces.
Tables in this section show the access level(s) where the command or command
option is active. Access levels in the relay are Access Level 0, Access Level 1,
Access Level B (breaker), Access Level P (protection), Access Level A (automa-
tion), Access Level O (output), and Access Level 2. For information on access
levels see Changing the Default Passwords in the Terminal on page 3.10.
Command Description
2ACCESS
Use the 2AC command to gain access to Access Level 2 (full relay control). See
Access Levels and Passwords on page 3.7 for more information.
Ta b l e 1 4.1 2AC C o m m a n d
Command Description Access Level
2AC Go to Access Level 2 (full relay control). 1, B, P, A, O, 2
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