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ABB Relion 620 RER620 IEC 60870-5-101/104 Communication Protocol Manual

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This document is the official communication protocol manual for the ABB Relion 620 series RER620 device, covering the IEC 60870-5-101 and IEC 60870-5-104 protocols. It provides technical specifications, configuration guidance, and operational details for integrating the relay into substation automation systems.

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