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
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
-
122
REU 610
Voltage Relay
Technical Reference Manual - ANSI Version
1MRS755972
Содержание REU 610
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