A-2 Appendix A Date Code 20010518
SEL-2020 Instruction Manual
Firmware
Part/Revision No.
Description of Firmware
SEL-2020-R127-V0 Add Unsolicited Write message string (\W;saddr;n,daddr/).
Add new registers in Local database region for Unsolicited
Write statistics.
Improve efficiency of Fast Meter calculations so that
SEL-2020 performs better when collecting Fast Meter data
from several relays.
Change DNP settings so CONFIRM_TO setting is accessible
as long as CLASS is not set to 0. Previously,
CONFIRM_TO was hidden unless UNSOL_REP was set to
YES. Also changed lower limit on CONFIRM_TO setting
from 0 to 50 milliseconds.
On power-up auto-configuration, allow for a single auto-
configuration retry in the case where the port begins to auto-
configure for the relay but then fails (ConfigFail status).
Fix problem where DNP port would not function at all if
Master was polling it during power-up initialization.
Fix problem that could cause the wrong (inverted) value of
the SEL-321-1 Alarm bit (!ALRM) to be moved to the User
region via SET M. This was correctable using the FREEZE
and RELEASE operations. It is no longer an issue, so
FREEZE/RELEASE are not necessary.
Address memory loss caused by failed modem dial-out
messages (\Idstr/).
SEL-2020-R126-V0 Fix problem with clearing Archive data via the Automatic
Message string \Fp:An;C/.
SEL-2020-R125-V0 Add DNP time synchronization. Enhance Fast Meter
collection to reduce the number of Modbus “busy” responses
in units with Flash RAM (archive).
SEL-2020-R124-V0 Fix problem with Modbus bit reads from Target region.
SEL-2020-R324-V2 Fix problem with Modbus bit reads from Target region.
SEL-2020-R123-V0 Make Port F baud rate jumper force flow control so that
RTS/CTS=N, XON/XOFF=Y. Fix problem that under rare
circumstances, would result in failed Fast Meter collection.
SEL-2020-R323-V2 Supports alternate main board.
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