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.
6.4 Installing the serial communication cable for RS485
SEMOD176344-1 v1
6.4.1 RS485 serial communication module
SEMOD176342-152 v6
RS485
PWB
Screw
terminal
X1
Backplate
Screw
terminal
X3
Angle
bracket
1
2
4
5
6
3
1
2
en07000140.vsd
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 Name 4-wire Description
x3:1 soft earth
x3:2 soft earth
x1:1 RS485 + TX+ Receive/transmit high
or transmit high
x1:2 RS485 – TX- Receive/transmit low
or transmit low
x1:3 Term T-Term Termination resistor
for transmitter (and
receiver in 2-wire
case) (connect to TX+)
x1:4
reserved R-Term Termination resistor
for receiver (connect to
RX+)
x1:5
reserved RX- Receive low
x1:6 reserved RX+ Receive high
Table continues on next page
1MRK 514 026-UEN B Section 6
Connecting
670 series 2.2 IEC 73
Installation manual
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