Installing The Serial Communication Cable For Rs485; Rs485 Serial Communication Module - ABB RELION 670 Series Installation Manual

1MRK 514 026-UEN B
6.4
6.4.1
670 series 2.2 IEC
Installation manual
schemes on the IEEE/ANSI C37.94 protocol. The optical ports on the rear side of
the IED are X305, X306, X312, X313, X322 and X323.
When LDCM is used for binary signal exchange between IEDs in the same station
or even within the same panel, the fiber optic cables can be quite short (1-2
meters). With such an installation it is important to set the LDCM parameter
OptoPower = LowPower.

Installing the serial communication cable for RS485

RS485 serial communication module

Screw
1
terminal
2
X3
1
2
3
Screw
4
terminal
5
X1
6
Backplate
IEC07000140 V1 EN-US
Figure 44: The connection plate to the backplate with connectors and screws.
This figure also shows the pin numbering from the component side
Pin Name 2-wire
x3:1
x3:2
x1:1 RS485 +
x1:2 RS485 –
x1:3 Term
x1:4 reserved
x1:5 reserved
x1:6 reserved
Table continues on next page
Angle
bracket
RS485
PWB
en07000140.vsd
Name 4-wire
TX+
TX-
T-Term
R-Term
RX-
RX+
Section 6
Connecting
SEMOD176344-1 v1
SEMOD176342-152 v6
Description
soft earth
soft earth
Receive/transmit high
or transmit high
Receive/transmit low
or transmit low
Termination resistor
for transmitter (and
receiver in 2-wire
case) (connect to TX+)
Termination resistor
for receiver (connect to
RX+)
Receive low
Receive high
73