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Totalflow FCU 6400 PG&E Modbus Protocol Specification

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This document defines the PG&E communications protocol for Totalflow FCU (Flow Computer Units), detailing the implementation of Modbus RTU and ASCII message formats for data exchange. It covers register group configurations, poll group protocols, alarm bit mapping, and point type table definitions for the FCU 6400 (5333) with ModScan interface.

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