5.9
Date Code 20110408 Instruction Manual SEL-551 Relay
Serial Port Communications and Commands
Command Summary
Commands CLO through SET in Table 5. 4 can be executed from Access
Level 2. For example, enter the SET command at the Access Level 2 prompt
to make relay settings:
=>>SET <Enter>
While in Access Level 2, any of the commands available in the lower access
level can also be executed (commands ACC–TRI in Table 5.4).
Access Level C
The CAL access level is intended for use by the SEL factory, and for use by
SEL field service personnel to help diagnose troublesome installations. A list
of commands available at the CAL level is available from SEL upon request.
Do not enter the CAL access level except as directed by SEL.
The CAL command allows the relay to go to Access Level C (see ACC, 2AC,
and CAL Commands (Access) on page 5.11 for more detail). Enter the CAL
command at the Access Level 2 prompt:
=>>CAL <Enter>
Command Summary
Table 5.4 alphabetically lists the serial port commands within a given access
level. The SEL-551 Relay Command Summary at the end of this section (and
at the end of this manual) has similar information, expanded in detail. Much of
the information available from the serial port commands is also available via
the front-panel pushbuttons. The correspondence between the serial port
commands and the front-panel pushbuttons is also given in Table 5 .4. See
Section 6: Front-Panel Interface for more information on the front-panel
pushbuttons.
The primary differences between the serial port commands available at Access
Level 1 and those available at Access Level 2 are:
➤ The Access Level 1 commands primarily allow the user to look
at information only (e.g., settings, metering, etc.), not change it.
➤ The Access Level 2 commands primarily allow the user to
change settings or operate relay parameters and output
contacts.
The commands are shown in upper-case letters, but can also be entered with
lower-case letters.
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