Sel SEL-421 - Communications; COM C; COM C C and COM C R

R.9.10
SEL-421 Relay Reference Manual Date Code 20111215
ASCII Command Reference
Description of Commands
If you have assigned a circuit breaker auxiliary contact (52A) to a relay
control input (based on the 52AAn, 52ABn, 52ACn settings), the relay waits
0.5 second, checks the state of the circuit breaker, and issues either a
Breaker
OPEN
or Breaker CLOSED message.
If circuit breaker control enable jumper J18C is not in place, the relay aborts
the command and responds,
Aborted: the breaker jumper is not
installed
. If the relay is disabled, the relay responds, Command aborted
because relay is disabled
. If setting NUMBK := 1 and you issue the
CLOSE 2 command, the relay responds
Breaker 2 is not available.
COMMUNICATIONS
The COMMUNICATIONS command displays communications statistics for
the M
IRRORED BITS
®
communications channels and for synchrophasor client
channels. For more information on M
IRRORED BITS communications, see SEL
M
IRRORED BITS Communications on page R.5.15. For more information on
synchrophasor client communications see Section 7: Synchrophasors.
COM c
Use the COM c command to view records in the communications buffers for
specific relay communications channels.
The c option in the COM command is A for M
IRRORED BITS communications
Channel A, B for M
IRRORED BITS communications Channel B, and M for the
M
IRRORED BITS communications channels in general. If both MIRRORED BITS
communications channels are in use, then the M option does not function and
you must specify A or B.
COM c C and COM c R
The COM c C and COM c R commands clear/reset the communications
buffer data for the specified channel c. Options C and R are identical.
Tabl e 9. 29 CO M c Com mand
a
a
Parameter c is A, B, or M for Channel A, Channel B, and MIRRORED BITS communications
channels, respectively.
Command Description Access Level
COM A Return a summary report of the last 255
records in the communications buffer for
M
IRRORED BITS communications Channel A.
1, B, P, A, O, 2
COM B Return a summary report of the last 255
records in the communications buffer for
M
IRRORED BITS communications Channel B.
1, B, P, A, O, 2
COM M Return a summary report of the last 255
records in the communications buffer for either
M
IRRORED BITS communications Channel A
or Channel B when only one channel is
enabled.
1, B, P, A, O, 2