Intesis
TM
Modbus Server - KNX
User Manual r1.2 eng
© HMS Industrial Networks S.L.U - All rights reserved
This information is subject to change without notice
URL
http
s
://www.intesis.com
6 / 18
Functionality
From the KNX system point of view, in the start-up process of the gateway and also after a detection of a KNX bus
reset, the gateway polls the KNX signals configured to be updated in this situation and maintain the received values
in memory to be served to the Modbus system when requested. It also listens for any KNX telegram related to the
internal points configured in it and acts accordingly to the configuration of the related point.
From the Modbus system point of view, after the start up process, the gateway listens for any read or write request,
and serves any read request or performs any writing request of its internal points received from Modbus system. The
values received from Modbus become available to be read by the KNX system and vice-versa.
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 associated Group Address in the KNX
bus. See details in section.
When a telegram is received from a KNX Group address associated to a Modbus point, a message is sent
immediately to the corresponding Modbus device to perform the corresponding action.
Gateway’s capacity
Intesis capacity is listed below:
Element
100
version
250
version
600
version
1200
version
3000
version
Notes
Number of KNX
Communication
Objects
100
250
600
1200
3000
Maximum
number
of
KNX
Communication Objects that can
be defined.
Number of KNX Main
Group Addresses
100
250
600
1200
3000
Maximum number of KNX Main
Group Addresses to be used
Number of KNX
Associations
200
500
1200
2400
6000
Maximum number of KNX
Associations
Type of Modbus
Master devices
Modbus RTU (EIA485 or EIA232)
Modbus TCP
Those supporting Modbus
protocol
. Communication over
TCP/IP and RTU
Number of Modbus
Master devices
1 Master device per RTU Node
Up to 6 TCP connections
Number of Modbus Master
devices supported by the device