B.6
SEL-751 Relay Instruction Manual Date Code 20170927
Firmware Upgrade Instructions
Upgrade Firmware Using a Terminal Emulator
Upgrade Firmware Using a Terminal Emulator
The following instructions 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 (data rate, data bits,
parity, etc.), select transfer protocol (Xmodem/CRC or 1k Xmodem/CRC),
and transfer files (for example, send and receive binary files).
Step 1. If the relay is in service, open the relay control circuits.
Step 2. Connect the PC to the front-panel serial port and enter Access
Level 2.
Step 3. Save the present relay settings.
You can use the PC software (described in the instruction
manual PC software section) to save and restore settings easily.
Otherwise, use the following steps.
a. Issue the following commands at the ASCII prompt:
SHO, SHO L, SHO G, SHO P, SHO F, SHO R,
SHO C, etc.
b. Record all of the settings for possible re-entry after the
firmware upgrade.
c. We recommend that you save all stored data in the
relay, including EVENTS, before the upgrade.
Step 4. Start upgrading the firmware.
a. Issue the L_D command to the relay.
b. Type Y <Enter> at the following prompt:
Disable relay to receive firmware (Y/N)?
c. Type Y <Enter> at the following prompt:
Are you sure (Y,N)?
The relay sends the !> prompt.
Step 5. Change the data rate, if necessary.
a. Type BAU 115200 <Enter>.
This changes the data rate of the communications port
to 115200.
b. Change the data rate of the PC to 115200 to match the
relay.
Step 6. Begin the transfer of new firmware to the relay by issuing the
REC command.
Step 7. Type Y to erase the existing firmware or press <Enter> to
abort.
Step 8. Press any key (for example, <Enter>) when the relay sends a
prompt.
Step 9. Start the file transfer.
Select the Send file option in your communications software.
Use the Xmodem protocol and send the file that contains the
new firmware (for example, r101xxx.s19 or r101xxx.z19).
The file transfer typically takes less than 15 minutes at
115200 bps, depending on the product. After the transfer is
NOTE: To save the cal ib ration
settings, perform SHO C from the
terminal by logging into CAL level
using the CAL level password. The
factory-default password for CAL
level is CLARKE.
NOTE: When you are upgrading an
SEL-751 with a touchscreen front-
panel display, save all of the relay
settings, including the touchscreen
settings, using QuickSet.
NOTE: Change the baud rate of the
relay serial port to 9600 before
issuing the L_D command to start the
upgrade process.
NOTE: If you have difficulty at
115200 bps, choose a slower data
transfer rate (e.g., 38400 bps or
57600 bps). Be sure to match the
relay and PC data rates.
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