Knx To Bacnet Client; Specific Introduction; Functionality - HMS Networks Intesis IN701-KNX Series User Manual

IN701-KNX Series

KNX to BACnet Client

7. KNX to BACnet Client

7.1. Specific Introduction

This section describes the integration of BACnet MSTP and BACnet IP installations into KNX systems using the
KNX to BACnet client application of the Intesis gateway.
This integration allows a KNX system to access the signals and resources of a BACnet system as if they were part
of the KNX system itself and vice versa.
From the BACnet point of view, the gateway acts as a BACnet client device, so it can subscribe (COV) or perform
periodic polling and writings on configured BACnet objects. The BACnet points' values are available through its
KNX interface, acting in the KNX system as one more KNX device.
The gateway configuration is carried out through the configuration tool.
Figure 4. Integration of BACnet IP or MSTP devices into KNX control and monitoring systems

7.2. Functionality

From the BACnet system point of view, after starting it, the gateway subscribes to configured BACnet points or
reads them continuously from their respective BACnet server devices, updating in its memory the received value
of their Present_Value property.
Each Present_Value is associated with a KNX group object that, in turn, is associated with one or more KNX group
addresses.
When a KNX object changes, it is transmitted to the KNX system with its corresponding group address.
Likewise, when a change is received in a write-enabled KNX group object, the change is written to the
Present_Value property of the corresponding BACnet object associated with it (using the WriteProperty BACnet
service).
Therefore, the Intesis gateway performs as a single KNX device in the KNX system, offering communication
objects to access the BACnet objects of the configured external BACnet devices.
When polling BACnet server devices, if a non-response is detected, the corresponding virtual signal inside the
gateway will be activated to indicate the communication error to the KNX system as a KNX group object.
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