ABB REU 610 Technical Reference Manual page 122

REU 610
122
Voltage Relay
Technical Reference Manual - ANSI Version
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 5.2.2.-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 5.2.2.-7 Jumper numbering
Terminal Function
X8 Pull-up
X6 Termination
X7 Pull-down
X13 Pull-up
X12 Termination
X11 Pull-down
X14 4-wire/2-wire
1MRS755972
Signal
Data A (+ TX)
TX
Data B (- TX)
Data A (+ RX)
RX
Data B (- RX)
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