Table 1037: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-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
SEMOD158670-45 v1
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
Section 22 1MRK 502 066-UUS B
IED hardware
1322
Technical manual
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