KNX RF KNX Basic: exam questions with worked answers

Questions for the "KNX RF" topic

1. Q01

   What is the main carrier frequency used by KNX RF in Europe?

   • A.433.92 MHz
   • B.868.3 MHz
   • C.2.4 GHz
   • D.5.8 GHz

   4. KNX RF· Physikalische Schicht· Easy

   ▸

   Correct answer

   B — 868.3 MHz

   Learning tip

   KNX RF operates in the European ISM band at 868.3 MHz, which is lightly used and licence-free. The encoding is Manchester at a nominal rate of 16.384 kbit/s. Choice A (433 MHz) is used by other low-power systems (some remote controls, weather stations). Choice C (2.4 GHz) is the Wi-Fi/Zigbee/Bluetooth band. Choice D (5.8 GHz) is a higher Wi-Fi band, unrelated to KNX RF.

   Source: Wikipedia EN — KNX (RF section)

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2. Q02

   KNX RF Multi is newer than KNX RF Ready and uses several frequency channels to improve the robustness of the communication.

   TrueFalse

   4. KNX RF· RF Ready vs. RF Multi· Medium

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   Correct answer

   True

   Learning tip

   KNX RF Multi (multi-channel) is the currently recommended generation. It uses several channels within the 868 MHz band together with a fast retry mechanism to keep transmission reliable in noisy environments. KNX RF Ready (the older single-channel generation) was more sensitive to interference and is gradually being phased out in new product designs.

   Source: KNX RF Multi specification overview — Gira/Ekinex documentation

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