Fibre-Optic Rear Connectors (Plastic And Glass) - ABB REF610 Technical Reference Manual

1MRS755535
Feeder Protection Relay
Technical Reference Manual - ANSI Version
Table 5.2.3.-5

Fibre-optic rear connectors (plastic and glass)

Terminal Function
X5.3-TX Transmitter for plastic fibre
X5.3-RX Receiver for plastic fibre
X5.4-TX Transmitter for glass fibre
X5.4-RX Receiver for plastic fibre
RS-485 connection for the DNP 3.0 communication module
If the relay is provided with the optional DNP 3.0 communication module, the cable
is connected to terminals X5.8/1-2 and X5.8/4-8. The connection socket is a 8-pin
header-type socket and the terminals are of screw compression type.
The DNP communication module follows the DNP standard and is intended to be
used in a daisy-chain bus wiring scheme with 2- or 4-wire, half-duplex, multi-point
communication.
The maximum number of devices (nodes) connected to the bus where
the relay is being used is 32, and the maximum length of the bus is
1200 meters in optimum conditions and with slow communication
speed.
When connecting the relay to the bus, a quality twisted pair shielded cable is to be
used. The conductors of the pair are connected to A and B. If signal ground is being
used for balancing potential differences between devices/nodes, a quality dual
twisted pair shielded cable is to be used. In this case, one pair is connected to A and
B, and one of the conductors of the other pair to signal ground. When connecting
one device to another, A is connected to A and B to B.
When using a 4-wire bus, one pair is connected to +RX and -RX and the other to
+TX and -TX. If signal ground is being used, a quality cable with three or several
pairs is to be used and one of the conductors of a pair connected to signal ground.
The cable shield is to be connected directly to ground (shield GND) in one point/
device of the bus. Other devices connected to the bus should have the cable shield
connected to ground via a capacitor (shield GND via capacitor).
Signal ground can only be used for balancing potential differences
between devices/nodes if all devices connected to the bus have isolated
DNP interfaces.
The DNP communication module is provided with jumpers for setting bus
termination and fail-safe biasing. The bus is to be terminated at both ends, which
can be done by using the internal termination resistor on the DNP communication
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