Modbus Master link alternatives - Arc protection - Auto synchronization - Bay control and measurement - Merging unit - Transformer protection - 2 winding - Feeder protection - Voltage regulation - Capacitor bank protection - Petersen Coil control - Grid automation - Busbar differential protection (high impedance) - Back-up protection - Motor protection - Busbar protection (voltage and frequency) - Transformer protection - 3 winding - Interconnection protection - Generator protection - Power management/Load shedding - Modbus Communication Manual - REX640 Protection and control - PCL5 - IEC - ANSI - 15.05.2025

REX640 Modbus Master Communication Protocol Manual

Modbus Master-Slave communication is only possible over the serial communication interface.

Note: The protection relay must have a serial interface in its communication card for the protocol to be operational.