{
  "node": {
    "id": "term:data-logger",
    "type": "Term",
    "label": "Data logger",
    "properties": {
      "id": "data-logger",
      "name": "Data logger",
      "aka": [
        "CAN logger",
        "telematics logger"
      ],
      "section": "topic-data",
      "definition": "A device on the vehicle or bench that records bus traffic and sensor data to BLF or MDF4 files, often with triggers and remote upload. For field failures it is the black box from which the sequence of events is rebuilt.",
      "related": [
        "blf",
        "mdf4",
        "fleet-telematics",
        "freeze-frame"
      ],
      "url": "https://lemonergy.com/learn/glossary/data-logger/",
      "mentions": []
    }
  },
  "edges": [
    {
      "id": "edge:4222",
      "source": "term:data-logger",
      "target": "topic:topic-data",
      "type": "belongsTo",
      "properties": {
        "sourceFile": "terms.json"
      }
    },
    {
      "id": "edge:4223",
      "source": "term:data-logger",
      "target": "term:blf",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:4224",
      "source": "term:data-logger",
      "target": "term:mdf4",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:4225",
      "source": "term:data-logger",
      "target": "term:fleet-telematics",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:4226",
      "source": "term:data-logger",
      "target": "term:freeze-frame",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    }
  ],
  "neighbors": [
    {
      "id": "topic:topic-data",
      "type": "Topic",
      "label": "Data, communication and electronics",
      "properties": {
        "id": "topic-data",
        "name": "Data, communication and electronics",
        "lede": "The control units, chips, protocols and file formats through which a battery is measured, controlled and logged.",
        "context": "Separate quantities from encoding and transport.",
        "example": "2500 in a log might mean 25.00 °C, 2.5 V or raw counts. Units and scale must accompany the value.",
        "lesson_url": "https://lemonergy.com/learn/fundamentals/battery-basics/",
        "lesson_label": "Open battery basics"
      }
    },
    {
      "id": "term:blf",
      "type": "Term",
      "label": "BLF file",
      "properties": {
        "id": "blf",
        "name": "BLF file",
        "abbr": ".blf",
        "aka": [
          "Binary Logging Format",
          "Vector BLF"
        ],
        "section": "topic-data",
        "definition": "Vector’s compressed binary format for bus logs: every CAN, CAN FD, LIN or Ethernet frame with its timestamp and channel. It is the usual format of field logs from vehicles and test benches, decoded with the matching DBC file.",
        "related": [
          "dbc",
          "asc-log",
          "mdf4",
          "data-logger",
          "can-bus"
        ],
        "url": "https://lemonergy.com/learn/glossary/blf/",
        "mentions": [
          "can-fd"
        ]
      }
    },
    {
      "id": "term:mdf4",
      "type": "Term",
      "label": "MDF4",
      "properties": {
        "id": "mdf4",
        "name": "MDF4",
        "abbr": ".mf4",
        "aka": [
          "ASAM MDF",
          "Measurement Data Format",
          "MDF"
        ],
        "section": "topic-data",
        "definition": "The ASAM standard binary format for measurement data, version 4 with the .mf4 extension: it stores decoded signals and raw bus frames side by side with their units, conversions and timestamps, compressed and indexed so large logs open quickly. It is the common exchange format for vehicle and battery test data.",
        "related": [
          "blf",
          "dbc",
          "a2l",
          "xcp",
          "data-logger",
          "hdf5"
        ],
        "url": "https://lemonergy.com/learn/glossary/mdf4/",
        "mentions": []
      }
    },
    {
      "id": "term:fleet-telematics",
      "type": "Term",
      "label": "Fleet telematics",
      "properties": {
        "id": "fleet-telematics",
        "name": "Fleet telematics",
        "section": "topic-applications",
        "definition": "The systems that collect battery state, consumption and fault data from each vehicle in a fleet and bring them to the depot and the operator. For an electric bus fleet they are what turns BMS data into charging plans and warranty cases.",
        "related": [
          "fms-interface",
          "vdv-301",
          "depot-charging",
          "state-of-health",
          "electric-bus",
          "data-logger"
        ],
        "url": "https://lemonergy.com/learn/glossary/fleet-telematics/",
        "mentions": [
          "bms"
        ]
      }
    },
    {
      "id": "term:freeze-frame",
      "type": "Term",
      "label": "Freeze frame",
      "properties": {
        "id": "freeze-frame",
        "name": "Freeze frame",
        "aka": [
          "snapshot data",
          "extended data record"
        ],
        "section": "topic-data",
        "definition": "The set of values a controller saves at the moment a fault is detected — SOC, temperatures, current, the worst cell — attached to the trouble code. It is often the only record of the conditions that caused an intermittent fault.",
        "related": [
          "dtc",
          "uds",
          "data-logger"
        ],
        "url": "https://lemonergy.com/learn/glossary/freeze-frame/",
        "mentions": [
          "state-of-charge"
        ]
      }
    }
  ]
}