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8 – Overview

 RS485 User guide

Slave address: to adjust the address of the Modbus/RTU slave.

The Modbus master will refer to this address for each query / answer transaction with
this RVT.

Baud rate: to adjust the communication speed (bits/second).

Parity: to 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) through the Modbus communication.

The Modbus data table gives all the necessary information (addresses, access levels and
storage types) for a proper Modbus communication. [Detailed information is available
in “RVT Modbus RS485 adapter – RVT Modbus data table”].

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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