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Building Automation and Intelligent Building Systems Flashcards

7 cards from real RCDD practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Building Automation and Intelligent Building Systems flashcards as text

  1. Which standard defines the BACnet data communication protocol for building automation and control networks?

    Answer: ANSI/ASHRAE 135

    BACnet is defined by ANSI/ASHRAE Standard 135 and is also published internationally as ISO 16484-5.

  2. What is the default UDP port used by BACnet/IP?

    Answer: 47808

    BACnet/IP uses UDP port 47808 (0xBAC0) by default.

  3. A BACnet/IP network spans several IP subnets and devices need to exchange broadcast messages such as Who-Is. What device or function is required?

    Answer: BACnet Broadcast Management Device (BBMD)

    A BBMD forwards BACnet broadcasts across IP subnets because routers do not pass local broadcasts.

  4. BACnet MS/TP networks use which physical layer?

    Answer: EIA-485 (RS-485)

    MS/TP (Master-Slave/Token-Passing) runs over an EIA-485 twisted-pair bus.

  5. What is the recommended topology for an EIA-485 field bus serving BAS controllers?

    Answer: Daisy-chain with termination at both ends

    EIA-485 is designed as a daisy-chained bus terminated at each end to prevent signal reflections.

  6. Approximately what is the maximum recommended EIA-485 segment length at lower data rates?

    Answer: 1200 m (4000 ft)

    EIA-485 supports roughly 1200 m (4000 ft) per segment at lower baud rates.

  7. Which ANSI/TIA standard specifically addresses structured cabling for building automation systems?

    Answer: ANSI/TIA-862

    ANSI/TIA-862 covers structured cabling infrastructure for intelligent building and BAS applications.

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