View single post by ekarak
 Posted: Wednesday May 23rd, 2012 01:11 pm
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ekarak

 

Joined: Wednesday Apr 21st, 2010
Location: Athens, Greece
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The KNX standard states: no more than 3 retransmissions for a failed transmit with random back-off delay (not exponential like Ethernet!), so: Yes it's possible for a poorly programmed device that floods the bus to saturate it.

That's the reason why in practice most KNX devices have a "maximum transmissions rate" parameter, typical value set to something like 30 packets / 15 sec., as well as a "wait timeout before reading initial values from the bus" so as touchscreens coming alive after power failure to wait a little before querying e.g. temperature sensors.
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