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Introduction

Modbus is a well established protocol that is commonly used and ideally suited for connecting multiple devices in a commercial

/ institutional or industrial environment. This is largely because of its resilience when it comes to electrical interference. The

Brain's

interface is designed for serial communications protocols, but can be configured to communicate with a BAS (Building

Automation System) using Modbus protocols. When configured for Modbus, the Brain

Unit) that is monitored by the BAS.

The following is a guide for connecting the Brain (DRV25/DRV40/DRV80) to a BAS using a Modbus RTU protocol. Please

review the appropriate Brain Installation and Maintenance guide available at www.armstronginternational.come/brain to

familiarize yourself with the product specification and installation before attempting to connect the BAS.

Armstrong International

IOM-776

Brain

Modbus Networking

acts as an RTU (Remote Terminal