Schweitzer Engineering Laboratories SEL-321 - Loop

3-14 Communications Date Code 20011026
SEL-321/321-1 Instruction Manual
=>IRIG <ENTER>
IRIG <ENTER>IRIG <ENTER>
IRIG <ENTER>
EXAMPLE: BUS B, BREAKER 3 Date: 02/01/93 Time: 01:45:40.762
=>
If no IRIG-B signal is present or the code cannot be read successfully, the relay sends the error
message "IRIG-B DATA ERROR."
Note: Normally, it is not necessary to synchronize using this command because the relay
automatically synchronizes every few minutes. The IRIG command is provided to
prevent delays during testing and installation checkout.
LOOP
The LOOP command is used for testing the M
IRRORED BITS™ communications channel. With
the transmitter of the communications channel physically looped back to the receiver, the
M
IRRORED BITS addressing will be wrong and ROK will be deasserted (refer to Appendix H for
more information). The LOOP command tells the M
IRRORED BITS software to temporarily
expect to see its own data looped back as its input. In this mode, LBOK will assert if error-free
data is received.
The LOOP command without any additional parameters enables looped back mode for 5 minutes,
while the inputs are forced to the default values.
=>>LOOP <ENTER>
LOOP <ENTER>LOOP <ENTER>
LOOP <ENTER>
Loopback will be enabled on the Mirrored Bits port for the next 5 minutes.
The RMB values will be forced to default values while loopback is enabled.
Are you sure (Y/N) ? Y <ENTER>
Y <ENTER>Y <ENTER>
Y <ENTER>
=>>
To enable looped back mode for other than the default 5 minutes, enter the desired number of
minutes (1 - 5000) as a command parameter. To allow the looped back data to modify the RMB
values, include the DATA parameter.
=>>LOOP 10 DATA <ENTER>
LOOP 10 DATA <ENTER>LOOP 10 DATA <ENTER>
LOOP 10 DATA <ENTER>
Loopback will be enabled on the Mirrored Bits port for the next 10 minutes.
The RMB values will be allowed to change while loopback is enabled.
Are you sure (Y/N) ? N <ENTER>
N <ENTER>N <ENTER>
N <ENTER>
Canceled.
=>>
To disable looped back mode before the selected number of minutes, reissue the LOOP
command with the R parameter.