PR122/P, PR123/P, PR332/P, PR333/P Modbus System Interface Specification

This document provides a technical specification and register map for the Modbus system interface used with ABB protection relays PR122/P, PR123/P, PR332/P, and PR333/P, including communication modules PR120/D-M and PR330/D-M. It details communication parameters, available Modbus functions (03, 04, 06, 08, 16, 17, 70), exception responses, and a comprehensive register map covering commands, statistical data, measures, configuration, trip history, and waveform data.