Question
A bus termination (end-of-line resistor) must be installed at each end of a KNX TP segment, in the same way as for an RS-485 bus.
Answer
False
False. KNX TP does not use any bus termination, which is one of its major differences from other differential buses such as RS-485 or CAN. As a result the physical topology can freely combine line, star and tree shapes without termination constraints. Only the closed-loop (ring) topology is forbidden.
Preparation tip
Do not transfer RS-485/CAN reflexes to KNX TP — adding a 120 ohm resistor at line ends here is unnecessary and may even disturb communication.
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