Date Code 20171021 Instruction Manual SEL-421 Relay
Instruction Manual
APPENDIX A
Firmware, ICD File, and Manual Versions
Firmware
Determining the Firmware Version
To determine the firmware version, view the status report by using the serial port
ID command or the front-panel LCD View Configuration menu option. The sta-
tus report displays the Firmware Identification (FID) number.
NOTE: The SEL-421-4, -5 relays
(firmware version R3xx) are
incompatible with the previous
SEL-421-0, -1, -2, -3 relays (firmware
versions R1xx and R2xx). Do not
attempt to load R3xx firmware on the
previous hardware or R1xx or R2xx
firmware on the new hardware.
The firmware version will be either a standard release or a point release.
A standard release adds new functionality to the firmware beyond the specifica-
tions of the existing version. A point release is reserved for modifying firmware
functionality to conform to the specifications of the existing version.
A standard release is identified by a change in the R-number of the device FID
number.
Existing firmware:
FID=SEL-421-x-R100-V0-Z001001-Dxxxxxxxx
Standard release firmware:
FID=SEL-421-x-R101-V0-Z001001-Dxxxxxxxx
A point release is identified by a change in the V-number of the device FID num-
ber.
Existing firmware:
FID=SEL-421-x-R100-V0-Z001001-Dxxxxxxxx
Point release firmware:
FID=SEL-421-x-R100-V1-Z001001-Dxxxxxxxx
The release date is after the D. For example, the following is firmware version
number R100, release date December 10, 2003.
FID=SEL-421-x-R100-V0-Z001001-D20031210
Similarly, the device SEL
BOOT firmware revision (BFID) will be reported as:
BFID=SLBT-4XX-Rxx-Vx-Zxxxxxx-Dxxxxxxxx
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