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1 Introduction
1.1 Intended audience
This manual is intended for installers, commissioning people, network managers
who need to install an RS485 network, start or maintain a supervision system
based on the Modbus protocol.
1.2 Before you start
This manual describes the RS485 Modbus adapter.
To be able to access data of the Power Factor Controller RVT Touchscreen consistently,
a basic knowledge of it is needed. Functionality of the RVT, meaning of various
measurements, logging of data are some particular aspects that should be familiar.
If not, please refer to the RVT Installation and operating Instructions to get the sufficient
knowledge.
To know more about the RVT data access, please refer to the RVT Modbus data table.
As other devices may be connected through the RS485 Modbus adapter, the term
"controller" will be used here to define the device.
1.3 How to use this manual
Chapter 2 is a short description of the Modbus adapter.
Chapter 3 contains a description of the physical layer. Connection to a controller is
described.
Chapter 4 gives all technical details concerning the Modbus adapter.
Chapter 5 is an overview of the Modbus protocol and how Modbus is implemented in the
controller.
Chapter 6 contains the table reference and formats to access data.
Chapter 7 is a reference in case of problems
Chapter 8 is dedicated to annexes
RS485 ç Introduction 3
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