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Controller Interface D evice. Jacob Preston ECE 404 NIATT – Dr. Ahmed Abdel- Rahim. Objectives. Update parallel interface to SDLC Respond to traffic controller requests Emulate Malfunction Management Unit, Detector Rack, and Terminals and Facilities

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Controller interface d evice

Controller Interface Device

Jacob Preston

ECE 404

NIATT – Dr. Ahmed Abdel-Rahim


Objectives
Objectives

  • Update parallel interface to SDLC

  • Respond to traffic controller requests

  • Emulate Malfunction Management Unit, Detector Rack, and Terminals and Facilities

  • Ethernet communication with PC for use with VISSIM software


Traffic controller messages
Traffic Controller Messages

  • SDLC Frames (packets) defined in NEMA TS 2 Standard

  • Command messages (from traffic controller)

    • Type 0 : MMU Load Switch Drivers (?)

    • Type 1 : MMU Inputs/Status request

    • Type 3 : MMU Programming request (?)

    • Type 10 : TF Outputs/Inputs request

    • Type 20 : DR Call Data request


Emulated response messages
Emulated Response Messages

  • Type 128 : MMU Type 0 ACK (?)

  • Type 129 : MMU Inputs/Status Type 1 ACK

  • Type 131 : MMU programming Type 3 ACK (?)

  • Type 138 : TF Inputs Type 10 ACK

  • Type 148 : DR Call Data Type 20 ACK



Sdlc packets
SDLC Packets

  • Opening flag : 0x7E

  • Address

  • Control : 0x83

  • Variable length information (depending on message type)

  • 16 bit CRC (MSB first)

  • Closing flag : 0x73

  • 0 bit insertion after 5 consecutive binary 1s



Example simulation type 1 command
Example Simulation: Type 1 Command


Issues encountered
Issues Encountered

  • CRC bit order and inversion

    • CRC passes if receiver decodes 0xF0B8

  • Decoding different packets

  • Sending SDLC Messages

    • Variable length messages being sent

    • Check for transmit of closing flag



Continuing work
Continuing work

  • Summer opportunity

  • Ethernet Interface



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