Power down behaviour
The EIB specifications do not imply conditions on the reaction of the application concerning bus power up and bus power down behaviour.
- The only thing that is specified is the reaction of the physical layer (at which bus voltage can it start drawing current, when does it have to stop drawing current). This is to enable a clean power up/down at all.
- Existing implementations based on BCU's and BIM's allow the application developer to control this behaviour by dedicated routines. However, this is only tested if the manufacturer declares that the behaviour can be controlled (e.g. via some parameter), but it considers longer power interruptions of at least several seconds.
- Shorter interruptions are in the "uncontrolled area" where side conditions like the current state of the device, its current power consumption, tolerances in components and the specific processor behaviour play a role. This is out of the control of the software developer and is not tested.
- BCU 2 is not basically different from BCU 1 in this respect.
Mr. Steven De Bruyne
System Department - KNX Association
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