Installing The Serial Communication Cable For Rs485; Rs485 Serial Communication Module - ABB RET670 Installation And Commissioning Manual

1MRK 504 088-UEN C
5.6
5.6.1
Installation and commissioning manual

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
Figure 35: 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
2–wire: Connect pin X1:1 to
pin X1:6 and pin X1:2
to pin X1:5.
Termination (2-wire): Connect pin X1:1 to
pin X1:3
Termination (4-wire): Connect pin X1:1 to
pin X1:3 and pin X1:4
to pin X1:6
Angle
bracket
RS485
PWB
en07000140.vsd
Name 4-wire
TX+
TX-
T-Term
R-Term
RX-
RX+
Section 5
Installing the IED
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
65