Terms - Alphabetized:

• Acknowledge A single bit, transmitted by the receiving node, in response to data
• Active Error Detection Detected errors are made public.
• Arbitration Priority bitwise "Bid for Buss" to avoid collision
• Basic-CAN Basic functions limitations - low baud rates
• Bit-Construction Data bits, constructed of 8-12 Time Quantum’s ("TQ")
• Bit-Monitoring All nodes monitor the dominate and recessive states
• Bit-Stuffing After 5 consecutive identical data bits, an alternate bit is imposed
• Bus Speeds Class A-up to 10Kb, B-10Kb to 125Kb, C-125Kb to 1 Mb
• CAN Controller Area Network
  • A multi-master bus, using open linear structure, with one logic bus line, and equal nodes)
  • (Complies with the 7-layer ISO/OSI communication reference model)
• CAN_H CAN High (+3.5V)
• CAN_L CAN Low (+1.5V)
• CAN_Open CAL Based Profile-Layer-Protocol by CiA for interchangeability
• Can Overload-Frame Generated by a node that is not ready
• CAN Protocol Versions V2.0A (Standard) and V2.0B Active and Passive (Extended)
• CiA CAN in Automation
• CRC Cyclic Redundancy Check (X15+X14+X10+X8+X7+X4+X3
• DBT Distributor
• DCF Device Description File
• Delimiter A passive bit between Fields
• De-Stuffing The action of the receiver to remove stuffing bits from the data stream.
• Device Limitation Maximum number of "Nodes"
• Distance Limitation 130 ft (40 meters)
• DLC Data Length Code
• DLL Data Link Layer (not Dynamic Link Library)
• DOD Device Object Directory
• Dominant Level (Bit) +1.5V ( bus state for a single-line) [ "Wired-And" Pull-Down]
• Dominant Bit ( Bus State) When the CAN_H line and the CAN_L lines are both at +2.5V
• EDS Electronic Data Sheet
• EMI Electro-Magnetic-Interference
• Error Active State Node will transmit a public dominant Error Frame.
• Error Frame A series of consecutive dominant or recessive bits, followed by a series of 6 recessive bits.
• Error Off State
• Error Passive State Node will transmit a recessive Error Frame
• Full-CAN Greater hardware management – higher baud rates
• Hamming The process of shifting & combining bits to create a unique code
• Hard Synchronization Synchronization on the falling edge of the Start Of Frame Bit
• ISO International Standardization Organization
• Line-Termination 120 ohms (each end of the line)
• LLC Logic Link Control
• MAC Medium Access Control
• MDTP Multiplexed Domain Transfer Protocol
• NMT Network Management
• Node Passive or Active Device
• Node Guarding Device Failure Detection ("disconnected")
• NRZ Bit Coding Non-Return to Zero
• OSI Organization of Standards Institute (7 Layer)
• Passive Error Detection
• PDO Process Data Object
• Phase Buffer Segment 1 Compensation for phasing errors, by lengthening the data-bit for re-sync
• Phase Buffer Segment 2 Compensation for phasing errors, by shortening the data-bit for re-sync
• Propagation Segment A programmable 1-8 Time Quanta variation (delay compensation).
• Protocol Established method or procedure for data communication.
• Recessive Level (Bit) +3.5V ( bus state for a single-line, with ground reference)
• Recessive Bit ( Bus State) When the CAN_H line is at +3.5V, and the CAN_L is at +1.5V
• Re-synchronizing (Hard) At each Recessive to Dominant edge transition
• Resynchronization Jump Width Limited to 1-4 TQ, but not longer than Phase Buffer Seg 2
• RTR Remote Transmission Request bit
• SAE Society of Automotive Engineers
• SDO Service Data Object (provide access to entries in a Device Object Directory)
• SEP Stored Event Protocol
• SDO Service Data Object
• SLIO Serial Link I/O (CAN slaves)
• SOF Start of Frame
• Sync Sync Pulse, or Synchronization Process
• Synchronization Segment The first segment within a CAN bit
• TQ Time Quantum /8 to /25 per Bit , [4 Segments per bit time]
• Transfer Rates 1 Mb/sec
• VAN Vehicle Area Network

Usage Terms (by groups):

• Arbitration Priority bitwise "Bid for Bus" to avoid collision
• Basic-CAN Basic functions limitations - low baud rates
• Full-CAN Greater hardware management – higher baud rates
• NRZ Bit Coding Non-Return to Zero
• Bit-Stuffing After 5 consecutive identical data bits
• Recessive Level (Bit) +3.5V ( bus state)
• Dominant Level (Bit) +1.5V ( bus state) [ "Wired-And" ]
• Line-Termination 120 ohms (each end of the line)
• Re-synchronizing (Hard) At each Recessive to Dominant edge transition
• Node Passive or Active Device
• Node Guarding Device Failure Detection
• Transfer Rates 1 Mb/sec
• Distance Limitation 130 ft (40 meters)
• Bus Speeds Class A-up to 10Kb, B-10Kb to 125Kb, C-125Kb to 1 Mb
• Device Limitation Maximum number of "Nodes"

Phases:

• Standard Protocol (V2.0A)
• Extended Protocol (V2.0B)
• Passive
• Active

Key Phrases:

• Bit-Stuffing After 5 consecutive identical data bits
• Node Guarding Device Failure Detection
• Re-synchronizing (Hard) At each Recessive Bit to Dominant Bit
• Noise Immunity to EMI Differential-Mode Interfacing
• Hamming The process for combining bitwise codes for uniqueness

Equipment Variations:

• CANopen CAL Based Profile-Layer-Protocol by CiA for interchangeability
• CANopen Chip Micro-Controller Chip that conforms to CAN open
• CANopen Software Software Protocol that conforms to CAN Open
• CANadapter
• pcNET-CAN 8-Bit PC ISA Card, for CAN Activity
• PCAN-Dongle
• SLIOmodul Serial Link I/O Module

Frame Formats:

• Data Frame
• Remote Frame
• Error Frame
• Overload Frame
• Space (Inter Frame)

Fields within the Data Frame:

• Start-of-Frame 1 bit
• Arbitration Field 11 + 1 bits
• Control Field 11 + 4 bits
• Data Field 0 to 64 (plus filler bits)
• CRC Field 15 + 1 bits
• Acknowledge Field 2 bits
• End-of-Frame 7 bits

Fields within the Remote Frame:

Start of Frame

• Arbitration Field 11 bits, plus Dominant RTR Bit
• Control Field 11 + 4 bits
• No Data Field
• CRC Field 15 + 1 bits
• Acknowledge Field 2 bits
• End-of-Frame

Fields within the Error Frame:

• Error Flag Field 6 to 12 bits
• Error Delimiter Field 8 bits (Recessive)

  Detected Errors:

  • CRC Error
  • ACK Error
  • Form Error
  • Bit Error
  • Stuff Error

Fields within the Overload Frame:

• Error Flag Field 6 bits
• Superimposition of Active Overload Flags 0 to 6 bits
• Error Delimiter Field 8 bits (Recessive)

Fields within the Interframe Space:

• Intermission Field 3 bits
• Bus Idle (Recessive)

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CAN Glossary & Summarization – SfE_DCS – 01/31/2014