Schweitzer Engineering Laboratories SEL-421-4 - Table B.5 Serial Port Settings Differences; Table B.6 Ethernet Port Settings Differences; Front-Panel Settings Changes

B.4
SEL-421 Relay Instruction Manual Date Code 20171021
Converting Settings From SEL-421-0, -1, -2, -3 to SEL-421-4, -5
Front-Panel Settings Changes
Front-Panel Settings Changes
In the SEL-421-4, -5, the LED alias settings (TnLEDA) have been removed.
Their equivalent functionality is available by aliasing the TLED_n bits using
SET T. The only difference is that the old alias settings accept eight character
aliases whereas the SET T aliases only accept seven characters.
Port Settings Changes
Serial Port Settings
The following table highlights key differences in the Serial Port settings between
the SEL-421-1, -2, -3 and the SEL-421-4, -5.
Ethernet Port (Port 5) Settings
In the SEL-421-1, -2, -3, Ethernet was supplied by different Ethernet hardware.
This has significant impact on the settings, as described in Table B.6.
Table B.5 Serial Port Settings Differences
Old SEL-421 Settings New SEL-421 Settings Notes
N/A DNPCL This is a new setting. It needs to be set to Y to enable control operations on a
DNP port. in the old SEL-421, control was always enabled.
Table B.6 Ethernet Port Settings Differences (Sheet 1 of 2)
Old SEL-421 Settings New SEL-421 Settings Notes
IPADDR
SUBNETM
IPADDR This setting now operates using CIDR rules, which consolidates the old SUB-
NETM setting into the IPADDR setting.
FAILOVER NETMODE A FAILOVER of N is equivalent to a NETMODE of FIXED. A FAILOVER of
Y is equivalent to a NETMODE of FAILOVER. NETMODE also has a
SWITCHED open, which enables both ports.
NETPORT NETPORT The old setting had choices of A, B, and D, for ports A, B, and to disable. The
new setting has choices of C and D, for ports C and D.
NETASPD NETCSPD
NETBSPD NETDSPD
HOSTn
IPADRn
The HOST and IPADR settings no longer exist.
T1RECV ETELNET
T1CBAN TCBAN
T1INIT This setting no longer exists.
T1PNUM TPORT
T2CBAN
T2RECV
T2PNUM
These settings have been eliminated. They existed for access to the SEL-2702
local interface, which no longer exists.
ENDNP EDNP The old setting was a Y, N selection. The new setting selects the number of
enabled DNP sessions, from 0 to 6. The old choice of N is equivalent to the new
choice of 0 and the old choice of Y is equivalent to the new choice of 6.
DNPPNUM DNPPNUM The range is slightly more restrictive in the new implementation. The lowest
assignable port is 1025.