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ABB Instrumentation Modbus Serial Communications Applications Guide

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This document outlines applications for Modbus Serial Communications, including data recording, process changes, and system upgrades, using ABB Instrumentation products like COMMANDER, DATUM, and MOD 30ML. It also provides a detailed FAQ section covering serial interfaces (RS232, RS422, RS485), Modbus protocols (RTU, ASCII, Plus), master/slave configurations, network distances, and hardware considerations.

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