1MRK 514 026-UUS F
6.4
Installing the serial communication cable for RS485
6.4.1
RS485 serial communication module
Screw
terminal
X3
Screw
terminal
X1
Backplate
IEC07000140 V1 EN-US
Figure 46: The connection plate to the backplate with connectors and screws. This figure
Pin
x3:1
x3:2
x1:1
x1:2
x1:3
x1:4
x1:5
x1:6
2–wire:
Termination (2-wire):
Termination (4-wire):
The distance between connection points should be < 1200 m (3000 ft), see Figures
the outer shielding is connected to the IED with the cable clamp, shown in Figure 32. The cable
670 series
Installation manual
Angle
bracket
1
2
1
2
RS485
3
PWB
4
5
6
also shows the pin numbering from the component side
Name 2-wire
RS485 +
RS485 –
Term
reserved
reserved
reserved
Connect pin X1:1 to pin
X1:6 and pin X1:2 to pin
X1:5.
Connect pin X1:1 to pin
X1:3
Connect pin X1:1 to pin
X1:3 and pin X1:4 to pin
X1:6
en07000140.vsd
Name 4-wire
TX+
TX-
T-Term
R-Term
RX-
RX+
Section 6
Connecting
SEMOD176344-1 v1
SEMOD176342-152 v6
Description
soft ground
soft ground
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
47
and 48. Only
67