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4 – Overview

 RS485 User guide

To be connected to RVT RS232
input (optical transceiver)

RVT RS485 Modbus adapter

To be connected to RVT power
supply connector

Please note that if the RVT is already installed and connected, the RVT power supply has
to be switched OFF during the Modbus adapter connection. [Detailed information on
RVT mounting is available in “RVT – Installation and Operating Instructions”]

2.3 Modbus adapter wiring

A proper cable must be used for the connection between the RVT Modbus adapter and
the  Modbus  master.  For  a  RS-485  connection  and  up  to  1200  m  (4000  ft),  a  24  AWG
twisted pair with foil shield and drain wire on each pair is usually required (Belden 9841
for 2-wire and 9729 for 4-wire or equiv.) [Detailed information is available in “RVT Modbus
RS485 adapter – Installation and Start up Guide”]

Please note that if the RVT is already installed and connected, the RVT power supply has
to be switched OFF during the Modbus adapter connection. [Detailed information on
RVT wiring is available in “RVT – Installation and Operating Instructions”].

Summary of Contents for RS485 Modbus adapter

Page 1: ...INSTRUCTION MANUAL RS485 Modbus adapter for RVT controller User guide...

Page 2: ...on 3 2 Overview 3 2 1 Introduction to Modbus 3 2 2 Modbus adapter mounting 3 2 3 Modbus adapter wiring 4 2 4 Modbus adapter terminal switch 5 2 5 RVT access level 5 2 6 RVT parameter settings for Modb...

Page 3: ...unication 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...

Page 4: ...A proper cable must be used for the connection between the RVT Modbus adapter and the Modbus master For a RS 485 connection and up to 1200 m 4000 ft a 24 AWG twisted pair with foil shield and drain wi...

Page 5: ...to prevent unauthorized modification of all or some of the parameters Three levels are described here below The access levels have to be taken into account for parameter settings through Modbus as sam...

Page 6: ...tings can only be modified in SET mode Bank settings item The bank settings item available at the bottom of the bank settings list can be either locked or unlocked When the bank settings item is set a...

Page 7: ...RS485 User guide Overview 7 All RVT parameters as well as all the RVT measurements are accessible through Modbus...

Page 8: ...set the parity checking Stop bit to set the number of stop bit s 2 7 Modbus data table Each data measurement value and parameter setting available on the RVT can be read or set parameter settings thro...

Page 9: ...ser guide Appendix 9 3 Appendix references Installation and operating instructions RVT RVT communication with Modbus RTU Modbus TCP and PQ Link protocols Installation and start up guide RS485 Modbus A...

Page 10: ...ut prior notice With regard to purchase orders the agreed particulars shall prevail ABB does not accept any responsibility whatsoever for potential errors or possible lack of information in this docum...

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