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ExcaliburA flexible KNX/TP1 node

• TU Wien
• Automation Systems Group
• Fritz Praus0025854
• fritz_at_praus.at

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Outline

• Introduction
• definition of terms
• requirements
• Hardware
• components
• design
• Software
• basic low level routines
• various stacks

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Definition of Terms

• Building Automation / Building Services
• lighting, HVAC
• security and access control, safety alarm
  systems, elevators,
• (white goods, brown goods)
• Field buses for building automation
• exchange of control data
• small data amounts
• robust

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EIB/KNX

• open standard
• EN 50090
• specification maintained by Konnex Association
• well-established in D-A-CH
• decentralized design
• Twisted pair medium
• CSMA with bitwise arbitration at 9600 bit/s
• hierachical 3 layer structure possible
• Powerline, radio transmission,

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EIB/KNX Devices and Interfaces

• EIB/KNX devices
• sensors, actuators
• Router (TP/TP vs. IP tunnelling for high-traffic
  backbones)
• gateways
• PC-based (management, visualization)
• EIB/KNX (TP) interfaces
• medium connection
• BCU, BIM Transceiver Microcontroller (Layer 7)
• TP-UART Transceiver Layer 2 ASIC
• application module/processor
• sensor/actuator module PEI as free
  digital/analog I/O
• µC/PC RS232 (BCU/TP-UART), USB, IP

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Requirements

• experimental embedded platform (lab use)
• universally applicable
• wish list EIB/KNX, RS232, IP, USB
• extensible (i.e. LON, IO pins, ..)
• support high-level way of working
• But offer powerful features
• low cost and compact
• design openly available

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Hardware - Components

• Fujitsu MB90330F 16-bit Microcontroller
• 24 MHz, 24Kbyte RAM, 384Kbyte flash memory
• 4 UARTS and USB
• external bus interface
• Crystal CS8900ACQ3 Ethernet Controller
• 2 TP-UARTs
• SD/MMC card connection

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Hardware Design

• Schematic
• PCB Layout
• Placement
• Conductors
• Power

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Software Low-Level Drivers

• TP-UART protocol
• asynchronous serial communication
• normal vs. analog mode (transceiver only)
• CS8900A protocol
• ISA bus
• SD card protocol
• SPI standard
• USB firmware
• slave / mini host

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Software IP Stack

• IP
• ICMP (echo)
• UDP
• TCP (single)
• ARP
• DHCP
• SLIP

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Software EIB/KNX

• EIB/KNX Stack
• cEMI
• EIBNet/IP
• Gateway functionality
• Tweety port

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• Thanks for your attention