
RS485 connector pinouts
The arrangement for the pins in the RS485 connector (figure
:
Table 706:
The arrangement for the pins
Pin
Name 2-wire
Name 4-wire
Description
1
RS485+
TX+
Receive/transmit high or transmit high
2
RS485–
TX–
Receive/transmit
3
Term
T-Term
Termination resistor for transmitter (and receiver in 2–
wir case) (connect to TX+)
4
N.A.
R-Term
Termination resistor for receiver (connect to RX+)
5
N.A.
RX–
Receive low
6
N.A.
RX+
Receive high
Screw
terminal
X3
1
2
1
2
3
4
5
6
Screw
terminal
X1
Backplane
Angle
bracket
RS485
PWB
IEC06000517 V1 EN
Figure 533:
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:
Section 19
1MRK505222-UUS C
IED hardware
1120
Technical reference manual
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