HMS Networks Intesis KNX Manuale utente

KNX

Modbus RTU Master

USER MANUAL

Issue date: 04/2020 r1.0 ENGLISH

IntesisTM KNX –Modbus Master User Manual r1.0 eng

This information is subject to change without notice

URL https://www.intesis.com

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Important User Information

Disclaimer

The information in this document is for informational purposes only. Please inform HMS Industrial Networks of any

inaccuracies or omissions found in this document. HMS Industrial Networks disclaims any responsibility or liability for

any errors that may appear in this document.

HMS Industrial Networks reserves the right to modify its products in line with its policy of continuous product

development. The information in this document shall therefore not be construed as a commitment on the part of

HMS Industrial Networks and is subject to change without notice. HMS Industrial Networks makes no commitment

to update or keep current the information in this document.

The data, examples and illustrations found in this document are included for illustrative purposes and are only

intended to help improve understanding of the functionality and handling of the product. In view of the wide range

of possible applications of the product, and because of the many variables and requirements associated with any

particular implementation, HMS Industrial Networks cannot assume responsibility or liability for actual use based on

the data, examples or illustrations included in this document nor for any damages incurred during installation of the

product. Those responsible for the use of the product must acquire sufficient knowledge in order to ensure that the

product is used correctly in their specific application and that the application meets all performance and safety

requirements including any applicable laws, regulations, codes and standards. Further, HMS Industrial Networks will

under no circumstances assume liability or responsibility for any problems that may arise as a result from the use of

undocumented features or functional side effects found outside the documented scope of the product. The effects

caused by any direct or indirect use of such aspects of the product are undefined and may include e.g. compatibility

issues and stability issues.

IntesisTM KNX –Modbus Master User Manual r1.0 eng

This information is subject to change without notice

URL https://www.intesis.com

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Gateway for the integration of Modbus RTU installations into

KNX TP-1 (EIB) enabled monitoring and control systems.

ORDER CODE

INKNXMBM1000100

IntesisTM KNX –Modbus Master User Manual r1.0 eng 
 
 
 
 
© HMS Industrial Networks S.L.U - All rights reserved 
This information is subject to change without notice 
 
 URL https://www.intesis.com 
 
 
 4 / 19 
 
INDEX 
 
1Description ...............................................................................................................................................5 
 Introduction.......................................................................................................................................5 
 Functionality .....................................................................................................................................6 
 Gateway’s capacity ..........................................................................................................................6 
2KNX System.............................................................................................................................................7 
 Description........................................................................................................................................7 
 Comms status Communication Objects...........................................................................................7 
 Points definition................................................................................................................................8 
3Modbus interface......................................................................................................................................9 
 Description........................................................................................................................................9 
 Points definition..............................................................................................................................10 
4Connections ...........................................................................................................................................11 
 Powering the device.......................................................................................................................12 
 Connection to KNX.........................................................................................................................12 
 Connection to Modbus ...................................................................................................................12 
4.3.1 Modbus RTU...........................................................................................................................12 
5Status LEDs ...........................................................................................................................................13 
6Set-up process and troubleshooting ......................................................................................................14 
 Pre-requisites .................................................................................................................................14 
 Configuration and Setup.................................................................................................................14 
6.2.1 Introduction.............................................................................................................................14 
6.2.2 ETS Parameters.....................................................................................................................14 
6.2.3 General configuration .............................................................................................................15 
6.2.4 Table.......................................................................................................................................16 
6.2.5 Sending the configuration to Intesis .......................................................................................17 
 Set-up procedure............................................................................................................................18 
7Electrical & Mechanical Features...........................................................................................................19 
 
 

IntesisTM KNX –Modbus Master User Manual r1.0 eng

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URL https://www.intesis.com

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1 Description

Introduction

This document describes the integration of Modbus RTU installations into KNX systems using the Intesis KNX–

Modbus Master gateway.

The aim of this integration is to make accessible Modbus system signals and resources from a KNX control system

or device, as if it was a part of the own KNX TP-1 (EIB) system and vice-versa.

For this, Intesis acts as a Modbus RTU master device in its Modbus interface, reading/writing registers of the Modbus

slave device(s), and offering these values through its KNX interface, acting in the KNX system as another KNX device

of the system. The readings of the Modbus slave device(s) are performed by Intesis gateway automatically through

a continuous polling.

Configuration is carried out through ETS configuration tool.

This document assumes that the user is familiar with KNX and Modbus technologies and their technical terms.

Integration of Modbus RTU Slaves

into KNX TP-1 (EIB)s control and monitoring systems

IntesisTM KNX –Modbus Master User Manual r1.0 eng

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Functionality

From the Modbus system point of view, after the start up process, Intesis reads continuously the points configured

to be read in the Modbus RTU Slave devices and updates in its memory all the values received from the Modbus

system.

Every one of the mentioned Modbus points is associated to a KNX group address, with this, all the Modbus system

is seen as one more KNX device from the KNX system point of view, with the same configuration and operation

characteristics.

When a change in any Modbus point occurs, a write telegram is sent to the KNX bus, of the associated KNX Group.

When a telegram is received from the KNX bus to the KNX Group address associated to a Modbus point, a message

is sent immediately to the corresponding Modbus device to perform the corresponding action.

In the continuous polling of the Modbus devices, if a non-response of the Modbus device is detected, the

corresponding virtual signal inside Intesis gateway will be activated indicating that there is a communication error

with the Modbus device. These virtual signals indicating communication status in real time with the Modbus devices

are also accessible from KNX, like the rest of the points of Intesis Gateway.

Gateway’s capacity

Intesis capacity is listed below:

Element

100

version

Notes

Number of

Communication

Objects

100

Maximum number of

Communication Objects that can

be defined.

Number of Main

Group Addresses

100

Maximum number of KNX Main

Group Addresses to be used

Number of

Associations

200

Maximum number of KNX

Association

Type of Modbus

slave devices

Modbus RTU (EIA485)

Those supporting Modbus

protocol.

Number of Modbus

Slave devices

Up to 255 Devices

Number of Modbus Slave

devices supported by the device

IntesisTM KNX –Modbus Master User Manual r1.0 eng

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2 KNX System

In this section, a common description for all Intesis KNX series gateways is given, from the point of view of KNX

system which is called from now on internal system The Modbus system is also called from now on external system.

Description

Intesis gateway KNX connects directly to the KNX TP-1 (EIB) bus and behaves as one more device into the KNX

system, with the same configuration and operational characteristics as other KNX device.

Internally, the circuit part connected to the KNX bus is opto-isolated from the rest of the electronics.

Intesis KNX receives, manages and sends all the telegrams related to its configuration to the KNX bus.

When receiving telegrams of KNX Groups associated to internal datapoints, the corresponding messages are sent

to the external system (Modbus) to maintain both systems synchronised in every moment.

When a change in a signal of the external system is detected, a telegram is sent to the KNX bus (with the associated

KNX group) to maintain both systems synchronised in every moment.

The status of the KNX bus is checked continuously and, if a bus drops down is detected, due to a failure in the bus

power supplyfor example, when the KNX bus is restored again, Intesis will retransmit the status of all the KNX groups

marked as "T" Transmit. Also, the Updates of the groups marked as "U" Update will be performed. The behaviour of

each individual point into Intesis is determined by the flags configured for the point.

Comms status Communication Objects

Intesis gateway has several KNX communication objects to get information about Modbus errors in Modbus

communications.

Number

Name

DPT

Description

1000

Status_Error/Alarm

1.005 [0-No Alarm; 1-Alarm]

It reports if there is some error on the

Modbus communications. If there are

timeouts or exceptions.

1001

Status_Modbus Dev Error

8.* 2-byte signed value

[Slave Id]

In case of alarm or error, it reports Modbus

device address which has errors or alarms.

1002

Status_Error Text

16.001 Character String

It is a String with all information about the

alarm or error “ss:ff:aaaa:ee”, where:

•ss: SlaveId (“00”…”3F”)

•ff: Function code (“00”…”10”)

•aaaa: Address (“0000”…”FFFF”)

•ee: Exception code (“00”…”0F”)

Exception codes are the same as in

Modbus plus “0F” which is the

comm error.

IntesisTM KNX –Modbus Master User Manual r1.0 eng

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Points definition

Every internal datapoint to define has the following KNX properties:

Property

Description

Object name

Descriptive information about the Communication Object or Signal.

DPT

It is the KNX data type used to code the signal's value. It will depend on the type of

signal associated in the external system in every case. In some integrations, it is

selectable, in others it is fixed due to the intrinsic characteristics of the signal.

Active

If activated, the point will be active in Intesis gateway, if not, the behaviour will be as if

the point is not defined. This allows deactivating points without the need of delete them

for possible future use.

IntesisTM KNX –Modbus Master User Manual r1.0 eng

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URL https://www.intesis.com

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3 Modbus interface

Description

Intesis gateway acts as master in the Modbus RTU Network and the other Modbus devices connected to the same

network communicating with Intesis must be always slave devices.

The Modbus protocol defines different types of function codes to use to read/write different type of registers that can

be found in Modbus devices, and also different data formats to encode values. See below (section 3.2) for all the

function codes and data formats supported by Intesis's Modbus interface.

Furthermore, the data encoding used for 16 bits registers (big-endian or little-endian) can be configured in Intesis'

Modbus interface. This is the byte order for data encoding (MSB..LSB or LSB..MSB). This data encoding, although

is specified as big-endian in Modbus protocol specification, it varies depending on manufacturer/type of slave.

This functionality provides a great flexibility to integrate a wide range of Modbus slave devices that can be found in

the market.

IntesisTM KNX –Modbus Master User Manual r1.0 eng

This information is subject to change without notice

URL https://www.intesis.com

10 / 19

Points definition

Each point defined in the Intesis gateway has the following Modbus features associated to it:

Feature

Description

# Slave

Modbus slave number to which the point belongs to.

Function code

Read Func

Write Func

One of the following Modbus function codes can be used:

•1- Read Coils.

•2- Read Discrete Inputs.

•3- Read Holding Registers.

•4- Read Input Registers.

•5- Write Single Coil.

•6- Write Single Register.

•15- Write Multiple Coils.

•16- Write Multiple Registers.

Data Coding

Format

One of the following Modbus data coding formats can be used:

•16/32/48/64 bits unsigned.

•16/32/48/64 bits signed (one’s complement –C1).

•16/32/48/64 bits signed (two’s complement –C2).

•16/32/48/64 bits Float.

•16/32/48/64 bits Bitfields.

•Error comm

Byte Order

•Big Endian

•Little Endian

•Word Inverted Big Endian

•Word Inverted Little Endian

The Modbus register address inside the slave device for the point.

Bit inside the

Bit inside the Modbus register (optional). The gateway allows bit decoding from

generic 16 bits input/holding Modbus registers.

Bit coding into 16 bit input/holding Modbus registers is used for some devices to

encode digital values into this type of registers, being these registers normally

accessible using Modbus function codes 3 and 4 (read holding/input registers).

#Bits

Number of bits to be used by this signal.

Operation

Opeations that can be applied to Modbus values before to be sent to KNX network.

On the reverse way, the inverse operation is applied to KNX values before to be

sent to Modbus network. The next operations can be used:

•- (No operation)

•x10 –Modbus value x 10; KNX value / 10

•/10 –Modbus value / 10; KNX value x 10

•x100 –Modbus value x 100; KNX value / 100

•/100 –Modbus value / 100; KNX value x 100

•Is equal –Checks if Modbus value is equal to Operation value configured, if

so, send 1 to KNX, otherwise, send 0.

Operation value

The operation value is the operand of the operations, which need it. Only Is equal

needs an operand.

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