Technical Data - ABB REG670 Technical Manual

Section 21
IED hardware
21.2.13.3
1188
Screw
terminal
X3
Screw
terminal
X1
Backplane
IEC06000517 V1 EN
Figure 538: 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

Technical data

Table 921: Galvanic RS485 communication module
Quantity
Communication speed
External connectors
Angle
bracket
1
2
1
2
RS485
3 PWB
4
5
6
Range or value
2400–19200 bauds
RS-485 6-pole connector
Soft ground 2-pole connector
1MRK502052-UEN B
Technical manual