module. The termination resistor is selected by setting jumper X6 or/and X12 to the
ON position. If the internal termination resistor of 120Ω is used, the impedance of
the cable should be the same.
The bus is to be biased at one end to ensure fail-safe operation, which can be done
using the pull-up and pull-down resistors on the communication module. The pull-
up and pull-down resistors are selected by setting jumpers X8, X7, X13 and X11 to
the ON position.
The 2-wire bus is selected by default (jumper X14) without termination or biasing.
The jumpers X6, X7, X8 and X12 are in OFF position. The jumpers X11 and X13
are in ON position.
Table 5.2.3.-6 RS-485 rear connector (DNP 3.0)
Terminal Function
X5.8-8 Data A (+ RX)
X5.8-7 Data B (- RX)
X5.8-6 Data A (+ TX)
X5.8-5 Data B (- TX)
X5.8-4 Signal GND (for potential balancing)
X5.8-3 -
X5.8-2 Shield GND (via capacitor)
X5.8-1 Shield GND
Table 5.2.3.-7 Jumper numbering
Terminal Function Signal
X8 Pull-up Data A (+ TX)
X6 Termination TX
X7 Pull-down Data B (- TX)
X13 Pull-up Data A (+ RX)
X12 Termination RX
X11 Pull-down Data B (- RX)
X14 4-wire/2-wire -
150
REF610REF610
Feeder Protection Relay
Technical Reference Manual - ANSI Version
1MRS755535
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