Sel 411L - Figure 3.179 Back-To-Back EIA-422 Connection; Figure 3.180 Back-To-Back EIA-422 Connection Using the SEL-3094; Table 3.136 EIA-422 Configuration Settings and Cables; Table 3.137 SEL-3094 Settings

P.3.266
SEL-411L Relay Protection Manual Date Code 20151029
Protection Functions
87L Communication and Timing
Back-to-Back Connections
A clock signal is required to control the transmission and reception of data.
Figure 3.179 shows an example of two relays directly connected via the DB25
ports, configured for EIA-422 protocol.
Figure 3.179 Back-to-Back EIA-422 Connection
Use the SEL-3094 Interface Converter to supply the required external clock
for back-to-back EIA-422 connections, as shown in Figure 3.175. Set the
relay transmit and receive clock polarity to F (falling) and set the
SEL-3094 as shown in Table 3.136.
Figure 3.180 Back-to-Back EIA-422 Connection Using the SEL-3094
Table 3.136 EIA-422 Configuration Settings and Cables
Manufacturer Product Channel Card
Interface
Adapter
DCE Tx/Rx Clock
Polarity Setting
Relay Clock
Polarity Setting
SEL Cable
SEL SEL-3094 NA Interface
Adapter
SW3 = A
SW4 = A
87TXCE = F,
87RXCE = F
C460
RFL IMUX DS561 MA406IA RXICP = Normal
TXICP = Normal
87TXCE = F,
87RXCE = R
C453
RFL IMUX DS561 MA408IA RXICP = Normal
TXICP = Normal
87TXCE = F,
87RXCE = R
C452
Pulsar FOCUS 64k NA NA 87TXCE = R,
87RXCE = R
C451
General Electric JMUX Nx64 Unit
86464-01
86447-90 Transmit = INT
Receive = INT
87TXCE = F,
87RXCE = R
C450
Table 3.137 SEL-3094 Settings
Dip Switch Position SEL-3094 (1) Position SEL-3094 (2) Function
1B B DCE
2 B A B—internal clock,
A—external clock
3–10 A A All other
64k Hz
– +
TXDA
TXDB
RXDA
RXDB
RXCA
RXCB
TXCA
TXCB
COMMON
SHIELD*
2
14
3
16
17
9
15
12
7
Relay
CH1/2
DB25 pin male
TXDA
TXDB
RXDA
RXDB
RXCA
RXCB
TXCA
TXCB
COMMON
SHIELD*
2
14
3
16
17
9
15
12
7
Relay
CH1/2
DB25 pin male
Relay (1) SEL-3094 (1)
C460 Cable C460 CableFiber Cable
SEL-3094 (2) Relay (2)