Introduction; Overview; Introduction To Modbus; Modbus Adapter Mounting - ABB RS485 Modbus adapter User Manual

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1 Introduction

This guide is designed to help you quickly install the RVT Modbus adapter and to
give an overview of the commissioning process. This guide makes reference to
more detailed documents made for installers, commissioning people and
network managers who are familiar with Modbus protocol and related matters.
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2 Overview

2.1 Introduction to Modbus

Modbus is a serial, asynchronous protocol. The Modbus protocol does not specify the
physical interface. The RVT Modbus adapter has an RS-485 interface.
[Detailed information is available in "RVT Modbus RS485 adapter – Installation and Start
up Guide"]
Modbus is designed to allow a communication between components of an installation
including one or several supervision systems.
Amongst the countless advantages and benefits of a communication capability, Modbus
is a well spread protocol in the industrial world and allow, for example, interconnection
between components for linked actions and information centralization.
Gateway between Modbus and other fieldbus can be found in the market giving access
to several other fieldbus systems.
The Modbus adapter is an optional device for the RVT Touchscreen which enables the
connection of the RVT to a Modbus system. The RVT is considered as a slave unit in the
Modbus network.
With the RVT Modbus adapter, all RVT information (measurements, serial number, alarm
messages...) and all parameters settings (switching strategy, protection levels...) are
accessible. [Detailed information is available in "RVT – Installation and Operating
Instructions"]

2.2 Modbus adapter mounting

The Modbus adapter has a customized design to fit the RVT case.
1. Plug the RVT Modbus adapter in the RVT dedicated connectors.
2. Fix the RVT Modbus adapter with the fixing screw (included in the delivery).
3. Ensure that all connections are tight
RS485 User guide ç Overview - 3