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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 net-
work, 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
2. Overview
This chapter contains a short description of the Modbus protocol and the RS485 interface.
2.1. Introduction to Modbus
Modbus is a serial, asynchronous protocol. The Modbus protocol does not specify the physical interface. The typical
physical interfaces are RS-232 and RS-485. The Interface Module uses the RS-485 interface.
Modbus is designed for integration with PLCs or other automation devices, and the services closely correspond to the
PLC architecture.
The Modbus commands and services supported by the Modbus adapter are discussed in Chapter 5.
2.2. The Modbus adapter
The Modbus adapter is an optional device for the Power Factor Controller RVT Touchscreen which enables the con-
nection of the RVT to a Modbus system. The controller is considered as a slave unit in the Modbus network.
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DOCUMENT ID
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RS 48 5 A DAPTE R
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