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“Excalibur” A flexible KNX/TP1 node

“Excalibur” A flexible KNX/TP1 node. TU Wien Automation Systems Group Fritz Praus 0025854 fritz@praus.at. Outline. Introduction definition of terms requirements Hardware components design Software basic low level routines various stacks. Definition of Terms.

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“Excalibur” A flexible KNX/TP1 node

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  1. “Excalibur”A flexible KNX/TP1 node TU Wien Automation Systems Group Fritz Praus0025854 fritz@praus.at

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

  3. 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

  4. 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, …

  5. 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

  6. 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

  7. 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

  8. Hardware – Design • Schematic • PCB Layout • Placement • Conductors • Power

  9. 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

  10. Software – IP Stack • IP • ICMP (echo) • UDP • TCP (single) • ARP • DHCP • SLIP

  11. Software – EIB/KNX • EIB/KNX Stack • cEMI • EIBNet/IP • Gateway functionality • Tweety port

  12. Thanks for your attention

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