B.5
Date Code 20110408 Instruction Manual SEL-551 Relay
Firmware Upgrade Instructions
Flash Firmware Upgrades
Step 19. After this procedure is completed and changes have been saved,
execute the QUIT command.
The relay is now ready for your commissioning procedure.
Flash Firmware Upgrades
Required Equipment
➤ Personal computer.
➤ Terminal emulation software that supports XMODEM/CRC
protocol.
➤ Serial communications cable (SEL 234A or equivalent).
➤ Disk containing firmware upgrade file.
Upgrade Procedure
The instructions below assume you have a working knowledge of your
personal computer terminal emulation software. In particular, you must be
able to modify your serial communications parameters (baud rate, data bits,
parity, etc.), disable any hardware or software flow control in your computer
terminal emulation software, select transfer protocol (i.e., XMODEM/CRC),
and transfer files (e.g., send and receive binary files).
Step 1. If the relay is in service, disable its control functions.
Step 2. Connect the personal computer to the relay serial port and enter
Access Level 2 by issuing the ACC and 2AC commands.
Step 3. Execute the Show Calibration (SHO C) command to retrieve
the relay calibration settings.
Step 4. Record the displayed settings (or save them to a computer file)
for possible reentry after the firmware upgrade.
Step 5. If you do not already have copies of the Global, Group, Logic,
Port, SER, and Text label settings, use the following Show
commands to retrieve the necessary settings: SHO, SHO L,
SHO P, SHO R, and SHO T.
Normally, the relay will preserve the settings during the
firmware upgrade. However, depending on the firmware
version that was previously installed and the use of relay
memory, this cannot be ensured. Saving settings is always
recommended.
Step 6. Set up your communication connection to the highest possible
baud rate. The relay will support speeds up to 38,400 baud.
Step 7. Use the SET P command to change the SPEED setting to the
desired baud rate.
Step 8. From Access Level 2, issue the L_D <Enter> command to the
relay (L underscore D <Enter>) to start the SEL
BOOT program.
Step 9. Type Y <Enter> at the
Disable relay to send or receive
firmware (Y/N)?
prompt and Y <Enter> to the Are you sure
(Y/N)?
prompt. The relay will send the SELBOOT prompt !>.
Step 10. Make a copy of the firmware currently in the relay. This is
recommended in case the new firmware download is
unsuccessful. To make a backup of the firmware, you will need
approximately 500 KB of free disk space. The procedure takes
approximately three minutes at 38,400 baud.
NOTE: If the SEL-551 contains
History (HIS) data, Event (EVE) data,
Metering (MET) data, or Sequential
Events Recorder (SER) data that you
want to retain, these must be
retrieved prior to performing the
firmware upgrade, because all of these
data sets may be erased in the
upgrade procedure.
NOTE: SELBOOT does not echo
nonalphabetic characters as the first
character of a line. This may make it
appear that the relay is not
functioning properly when just the
<Enter> key is pressed on the
connected PC, even though
everything is OK.
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