Port Setup - Sel -300 Series Application Manual

2
Figure 1 M
IRRORED
P S
ORT ETUP
To ensure the relays can properly communicate with each other, set up a serial port on each relay
for M
IRRORED
ers (e.g., the SEL-2800 Fiber-Optic Transceiver or SEL-2812 Fiber-Optic Transceiver With
IRIG-B) to convert serial to fiber. The SEL-311C-1 and SEL-421-5 support two separate
M B
IRRORED
channel. The SEL-321-1 channel is compatible with either of the SEL-421-5 channels. Table 1,
Table 2, and Table 3 provide example setting values for Port 2 on the SEL-421-5, SEL-311C-1,
and SEL-321-1, respectively. Use Table 1 and Table 2 for pilot protection between the SEL-421-5
and the SEL-311C-1, and use Table 1 and Table 3 for pilot protection between the SEL-421-5 and
the SEL-321-1. The port setup is identical for both POTT and DCB schemes.
There will be a communications delay between the data sent by the local relay and the data
received by the remote relay. This delay depends upon the selection of the baud rate and the data
processing speed of the relay. Choosing a higher baud rate can reduce this delay (for more infor-
mation on the relationship between baud rate and one-way data delay, refer to Table 10 in [3]).
Selecting the correct baud rate depends on the mode of communications between the two relays. If
a direct fiber-optic cable is used, industry practice is to use a higher baud rate. Generally, fiber is
capable of operating at higher baud rates because it has a faster data transfer capability. When you
use other modes of communication, lower baud rates should be considered based on the data trans-
fer capability of the communications medium.
Table 1 SEL-421-5 Port 2 Settings (Sheet 1 of 2)
Setting Setting Description
EPORT Enable Port
PROTO Communications Protocol
MBT Using Pulsar 9600 Modem?
SPEED Communications Baud Rate
RTSCTS Enable Hardware Handshaking
TX_ID M
IRRORED
RX_ID M
IRRORED
RBADPU M
IRRORED
Time
CBADPU PPM M
IRRORED
Pickup
d
TXMODE Transmission Mode
SEL Application Guide 2020-04
Relay 1
TX
RX
B Communications Via a Direct Fiber-Optic Connection
ITS
ITS ®
B communications. For direct fiber communications, use fiber-optic transceiv-
communications channels (Channels A and B), while the SEL-321-1 supports one
ITS
Setting
Value
Y
MBA
N
38400
N
B Transmit Identifier 2
ITS
B Receive Identifier 1
ITS
B Receive Bad Pickup 60
ITS
(default)
B Channel Bad 1000
ITS
(default)
P
Optical Fiber
Comment
The port must be enabled to set up communications.
a
Enable M
IRRORED
We are not using a Pulsar 9600 Modem.
b
The maximum baud rate for the SEL-421-5 is 38400.
Not needed for relay-to-relay communications.
Must match the receive identifier of the remote relay.
Must match the transmit identifier of the remote relay.
Channel error has to last 60 seconds before RBADx
asserts.
Ratio of channel downtime to total channel time.
e
Must be P for connections to devices that are not SEL-400
series relays.
Relay 2
RX
TX
B communications on Channel A.
ITS
Date Code 20200326
c