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IP Gateway KNX/BACnet N143
When a subscription is registered the BACnet object sends its current value, if a value is available for this object.
The validity of a value can be verified via the status property (Failure flag). Initially, the status failure flag for
the object type Binary Input, Binary Value, Analog Input and Analog Value is set to TRUE. Once a value is trans-
mitted from the KNX bus or from BACnet (for Binary Value or Analog Value) this status flag is set to FALSE.
When using a Priority Array with all Priority Array positions released then the last received KNX value is sent as
"relinquish default", if the value is valid.
All Analog and Binary BACnet objects supported by the device support the writeable Out-Of-Service property.
When this property is set to TRUE, the communication of the respective object with KNX is inhibited. Values of
Input objects can then be changed from the BACnet side, which otherwise would not be possible. Value
changes of objects with set Out-Of-Service property are also indicated via the object status flag Overridden. The
Out-Of-Service flag handling is especially important for finding errors in complex systems.
When the description of an object is requested from the BACnet side (ReadProperty "Description"), the descrip-
tion text is automatically generated and assembled from the object name, BACnet identifier and KNX group
address data separated by a colon (":").
Siemens Schweiz AG
Smart Infrastructure
Global Headquarters
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CH 6300 Zug
A6V10466141 RS-AC
Siemens AG 2022
Subject to change
GAMMA instabus
Technical Product Information
June 2022
5WG1143-1AB01
http://www.siemens.com/gamma-td
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