{
  "node": {
    "id": "term:can-high-low",
    "type": "Term",
    "label": "CAN high and CAN low",
    "properties": {
      "id": "can-high-low",
      "name": "CAN high and CAN low",
      "abbr": "CAN_H, CAN_L",
      "section": "topic-pack",
      "definition": "The two wires of a CAN bus, a twisted pair driven in opposite directions. Idle, or recessive, both sit near 2.5 V; for a dominant bit CAN_H is pulled up to about 3.5 V and CAN_L down to about 1.5 V, so the receiver reads the 2 V difference. Noise picked up by the pair adds equally to both wires and cancels in the difference.",
      "unit": "V",
      "related": [
        "can-bus",
        "termination-resistor",
        "can-fd"
      ],
      "url": "https://lemonergy.com/learn/glossary/can-high-low/",
      "mentions": []
    }
  },
  "edges": [
    {
      "id": "edge:3004",
      "source": "term:can-high-low",
      "target": "topic:topic-pack",
      "type": "belongsTo",
      "properties": {
        "sourceFile": "terms.json"
      }
    },
    {
      "id": "edge:3005",
      "source": "term:can-high-low",
      "target": "term:can-bus",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:3006",
      "source": "term:can-high-low",
      "target": "term:termination-resistor",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:3007",
      "source": "term:can-high-low",
      "target": "term:can-fd",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    }
  ],
  "neighbors": [
    {
      "id": "topic:topic-pack",
      "type": "Topic",
      "label": "Modules, packs and battery management",
      "properties": {
        "id": "topic-pack",
        "name": "Modules, packs and battery management",
        "lede": "From a single cell to a working battery system, and the electronics that keep it safe.",
        "context": "Make series/parallel architecture explicit.",
        "example": "Twelve 3.6 V, 5 Ah cells in 6s2p give 21.6 V, 10 Ah and 216 Wh nominally before other restrictions.",
        "lesson_url": "https://lemonergy.com/learn/fundamentals/cell-architecture/",
        "lesson_label": "Open cell architecture"
      }
    },
    {
      "id": "term:can-bus",
      "type": "Term",
      "label": "CAN bus",
      "properties": {
        "id": "can-bus",
        "name": "CAN bus",
        "aka": [
          "Controller Area Network",
          "ISO 11898"
        ],
        "section": "topic-pack",
        "definition": "The serial network over which a BMS talks to the vehicle or inverter: a two-wire differential bus, defined in ISO 11898, carrying short prioritised messages at up to 1 Mbit/s, or faster with CAN FD. Every node hears every message, and a dominant bit wins arbitration without any collision.",
        "related": [
          "can-high-low",
          "can-fd",
          "termination-resistor",
          "bms",
          "lin-bus",
          "fms-interface"
        ],
        "url": "https://lemonergy.com/learn/glossary/can-bus/",
        "mentions": [
          "inverter"
        ]
      }
    },
    {
      "id": "term:termination-resistor",
      "type": "Term",
      "label": "CAN termination",
      "properties": {
        "id": "termination-resistor",
        "name": "CAN termination",
        "aka": [
          "120 Ω termination"
        ],
        "section": "topic-pack",
        "definition": "A 120 Ω resistor between CAN_H and CAN_L at each end of the bus, matching the cable impedance so signals do not reflect. A healthy bus measures about 60 Ω between the two wires when powered down; 120 Ω means one terminator is missing.",
        "unit": "Ω",
        "related": [
          "can-bus",
          "can-high-low"
        ],
        "url": "https://lemonergy.com/learn/glossary/termination-resistor/",
        "mentions": [
          "impedance"
        ]
      }
    },
    {
      "id": "term:can-fd",
      "type": "Term",
      "label": "CAN FD",
      "properties": {
        "id": "can-fd",
        "name": "CAN FD",
        "aka": [
          "CAN with flexible data rate"
        ],
        "section": "topic-pack",
        "definition": "An extension of classical CAN that switches to a higher bit rate, up to 5–8 Mbit/s, for the data part of each frame and allows 64 data bytes instead of 8. BMS data-logging and over-the-air updates are its usual battery uses.",
        "related": [
          "can-bus",
          "can-high-low",
          "bms"
        ],
        "url": "https://lemonergy.com/learn/glossary/can-fd/",
        "mentions": []
      }
    }
  ]
}