R.9.27
Date Code 20111215 Reference Manual SEL-421 Relay
ASCII Command Reference
Description of Commands
The relay ignores received values if you do not specify the DATA option. You
can enter the options in any order.
LOOP R
The LOOP R command terminates the loopback condition on MIRRORED
B
ITS communications channels in loopback. If you do not specify a channel c,
then the relay disables loopback on both channels. If you specify a channel,
you can enter the options in any order.
MAP
Use the MAP command to view the organization of the relay database. The
MAP command in the SEL-421 is very similar to the MAP command in the
SEL-2020 and SEL-2030 Communications Processors. See Section 4:
Communications Interfaces for more information on the relay database
regions and data types.
MAP 1
The MAP 1 command lists the relay database regions. Database region names
are LOCAL, METER, DEMAND, TARGET, HISTORY, BREAKER,
STATUS, and ANALOGS.
MAP 1 region and MAP 1 region BL
Use the MAP 1 command with the region option to view the layout of a
specific region. Database region names are LOCAL, METER, DEMAND,
TARGET, HISTORY, BREAKER, STATUS, and ANALOGS.
Table 9.69 LOOP DATA Command
Command Description Access Level
LOOP DATA Begin loopback of a single MIRRORED BITS
communications channel (either Channel A or
Channel B) for 5 minutes: pass input data to
receive data as in nonloopback mode.
P, A, O, 2
LOOP c DATA Begin loopback of M
IRRORED BITS communi-
cations channel c only for 5 minutes: pass
input data to receive data as in nonloopback
mode.
P, A, O, 2
LOOP c DATA t Begin loopback of M
IRRORED BITS communi-
cations channel c only for t minutes: pass input
data to receive data as in nonloopback mode.
P, A, O, 2
Table 9.70 LOOP R Command
Command Description Access Level
LOOP R Cease loopback on all MIRRORED BITS communica-
tions channels. (Reset the channels to normal use.)
P, A, O, 2
LOOP c R Cease loopback on M
IRRORED BITS communications
channel c. (Reset channel c to normal use.)
P, A, O, 2
Tabl e 9. 71 MAP 1 Co mm a nd
Command Description Access Level
MAP 1 List the database regions in the relay. 1, B, P, A, O, 2
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