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1 Introduction to the controller
1.1 Intended audience
This manual is intended for programmers, commissioning people, supervision people
who need to start communication, access data, and to develop supervision software
which will interact with the Power Factor Controller RVT.
1.2 Before you start
This manual describes the RVT data table. These data are accessible through RS485,
USB, or Ethernet, using Modbus RTU and TCP protocols or PQ-Link software.
All information available from the keyboard of the RVT will be available through the data
table. Addresses, access levels and protocol information are of concerns.
To be able to access data of the Power Factor Controller RVT 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. Look in the RVT
operating manual to know more about it.
1.3 How to use this manual
Chapter 2 gives details concerning the Modbus protocol.
Chapter 3 describes Modbus functions and how Modbus is implemented in the
controller.
Chapter 4 describes USB / TCP/IP protocol and how it is implemented in the controller.
Chapter 5 contains the table reference and formats to access measurements / settings
data.
Chapter 6 describes the Windows DLL to handle USB / TCP/IP requests in a user specific
application.
1.4 Software protocols and physical interface
The RVT Power Factor Controller supports three communication protocols:
Modbus RTU and Modbus TCP
Three physical connections are available:
RS485 with the Modbus Adapter option
(Chapter
4).
4 Introduction ç RVT communication
(Chapter 2
and 3) and PQ-Link protocol
(Chapter
2), USB
(Chapter
(Chapter
4), Ethernet-RJ45
6).
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