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

Section 6
Connecting
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 42:
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
outer shielding is connected to the IED with the cable clamp, shown in Figure 32. The cable shield shall
68
Angle
bracket
1
2
1
2
RS485
3
PWB
4
5
6
The connection plate to the backplate with connectors and screws. This figure 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
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en07000140.vsd
Name 4-wire
TX+
TX-
T-Term
R-Term
RX-
RX+
1MRK514026-UUS Rev. P
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
43 and 44. Only the
670 series
Installation manual