Date Code 20080918 Instruction Manual SEL-749M Relay
Appendix B
Firmware Upgrade Instructions
Instructi on Manual
Overview
SEL occasionally offers firmware upgrades to improve the performance of
your relay. Because the SEL-749M Relay stores firmware in flash memory,
changing physical components is not necessary. Upgrade the relay firmware
by downloading a file from a personal computer to the relay via the front-
panel serial port as outlined in the following sections.
Required Equipment
Gather the following equipment before starting this firmware upgrade:
➤ Personal computer (PC)
➤ Terminal emulation software that supports XMODEM/CRC
protocol.
➤ Serial communications cable (SEL Cable C234A or equivalent,
or a null-modem cable)
➤ Disk containing the firmware upgrade (e.g., r101749m.s19) file
Upgrade Instructions
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.), select transfer protocol (XMODEM/CRC), and transfer files
(e.g., send and receive binary files).
Step 1. If the relay is in service, open the relay motor control circuits.
Step 2. Connect the PC to the front-panel serial port and enter Access
Level 2.
Step 3. Save the current relay settings.
PC software (described in Section 3: PC Software) can be used
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, etc.
b. Record all the settings for possible re-entry after the
firmware upgrade.
Courtesy of NationalSwitchgear.com
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