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PR122DC/PR123DC Modbus Communication System Interface Manual

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This document is a technical manual for the ABB Communication System Interface, which enables Modbus communication with protection trip units PR122DC and PR123DC when equipped with the PR120/D-M communication module. It details communication parameters, Modbus function codes, register maps, datalogger functionality, relay and signaling module configurations, and command execution for monitoring and controlling the apparatus.

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