ABB RELION 670 Series Technical Manual page 1328

Section 22
IED hardware
Table 1037:The arrangement for the pins
Pin Name 2-wire
1 RS485+
2 RS485–
3 Term
4 N.A.
5 N.A.
6 N.A.
IEC06000517 V1 EN-US
Figure 661: RS485 connector
• 2-wire: Connect pin 1 to pin 6 and pin 2 to pin 5
• Termination (2-wire): Connect pin 1 to pin 3
• Termination (4-wire): Connect pin 1 to pin 3 and pin 4 to pin 6
Soft ground connector pinouts
A second 2-pole screw connector is used for the connection of IO-ground. It can be used in two
combinations like:
• Unconnected: No ground of the IO-part · .
• Soft grounded: The IO is connected to the GND with an RC net parallel with a MOV
1322
Name 4-wire
TX+
TX–
T-Term
R-Term
RX–
RX+
Screw
1
terminal
2
X3
1
2
3
Screw
4
terminal
5
X1
6
Backplane
Description
Receive/transmit high or transmit high
Receive/transmit
Termination resistor for transmitter (and receiver in 2–wir case)
(connect to TX+)
Termination resistor for receiver (connect to RX+)
Receive low
Receive high
Angle
bracket
RS485
PWB
1MRK 502 066-UUS B
SEMOD158670-45 v1
Technical manual