Front communication - Arc protection - Bay control and measurement - Merging unit - Transformer protection - 2 winding - Feeder protection - Voltage regulation - Capacitor bank protection - Grid automation - Busbar differential protection (high impedance) - Line differential protection - Back-up protection - Motor protection - Busbar protection (voltage and frequency) - Interconnection protection - Generator protection - Power management/Load shedding - Operation Manual - REX615 Protection and control - PCL2 - IEC - ANSI - 30.10.2025

REX615 Operation Manual

The RJ-45 port in the LHMI enables front communication. Two LEDs are located above the communication port.

  • The green uplink LED on the left is lit when the cable is successfully connected to the port.
  • The yellow communication LED on the right flashes when the protection relay communicates with the connected device.
Figure 1. RJ-45 communication port and indication LEDs
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1
Uplink LED
2
Communication LED

The front port IP address and the corresponding subnet mask can be set via the LHMI. The front port has a factory default IP address 192.168.0.254, and it also provides DHCP server to assign an IP address for the connected computer.