{
  "node": {
    "id": "term:fms-interface",
    "type": "Term",
    "label": "FMS interface",
    "properties": {
      "id": "fms-interface",
      "name": "FMS interface",
      "aka": [
        "FMS standard",
        "bus FMS"
      ],
      "section": "topic-pack",
      "definition": "The manufacturer-independent CAN data interface of trucks and buses, defined by the major European OEMs, that exposes vehicle data — including, for electric vehicles, battery state of charge, charging status and energy consumption — to fleet-management telematics.",
      "related": [
        "can-bus",
        "vdv-301",
        "fleet-telematics",
        "state-of-charge",
        "electric-bus",
        "j1939"
      ],
      "url": "https://lemonergy.com/learn/glossary/fms-interface/",
      "mentions": [
        "differential-electrochemical-mass-spectrometry"
      ]
    }
  },
  "edges": [
    {
      "id": "edge:3858",
      "source": "term:fms-interface",
      "target": "topic:topic-pack",
      "type": "belongsTo",
      "properties": {
        "sourceFile": "terms.json"
      }
    },
    {
      "id": "edge:3859",
      "source": "term:fms-interface",
      "target": "term:can-bus",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:3860",
      "source": "term:fms-interface",
      "target": "term:vdv-301",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:3861",
      "source": "term:fms-interface",
      "target": "term:fleet-telematics",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:3862",
      "source": "term:fms-interface",
      "target": "term:state-of-charge",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:3863",
      "source": "term:fms-interface",
      "target": "term:electric-bus",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:3864",
      "source": "term:fms-interface",
      "target": "term:j1939",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:mentions/fms-interface/differential-electrochemical-mass-spectrometry",
      "source": "term:fms-interface",
      "target": "term:differential-electrochemical-mass-spectrometry",
      "type": "mentions",
      "properties": {
        "sourceFile": "terms.json",
        "method": "build_glossary.mention_index + mentions",
        "field": "definition",
        "meaning": "Text mention; 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:vdv-301",
      "type": "Term",
      "label": "VDV 301",
      "properties": {
        "id": "vdv-301",
        "name": "VDV 301",
        "aka": [
          "VDV-Schrift 301",
          "ITxPT"
        ],
        "section": "topic-standards-vehicle",
        "definition": "The VDV recommendation on the IP-based on-board network of a bus, the basis of the European ITxPT architecture. It is how battery state, charging status and energy data from the vehicle reach the operator’s fleet systems in a standard form.",
        "related": [
          "vdv",
          "fms-interface",
          "electric-bus",
          "fleet-telematics"
        ],
        "url": "https://lemonergy.com/learn/glossary/vdv-301/",
        "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:state-of-charge",
      "type": "Term",
      "label": "State of charge",
      "properties": {
        "id": "state-of-charge",
        "name": "State of charge",
        "abbr": "SOC",
        "section": "topic-state",
        "definition": "How full a cell is, as a fraction of its available capacity. State of charge, like temperature, affects how fast a stored cell ages.",
        "unit": "%",
        "related": [
          "depth-of-discharge",
          "ocv-soc-curve",
          "coulomb-counting",
          "state-of-health",
          "bms"
        ],
        "lesson": "fundamentals/battery-aging/#storage-soc",
        "example": {
          "title": "Interpret a charge inventory",
          "text": "If available capacity is 5 Ah and 3 Ah remains by the chosen estimator, SOC is 60%. A different estimate of available capacity changes this percentage, so compare SOC values only with the capacity convention recorded."
        },
        "url": "https://lemonergy.com/learn/glossary/state-of-charge/",
        "mentions": [
          "usable-capacity"
        ]
      }
    },
    {
      "id": "term:electric-bus",
      "type": "Term",
      "label": "Electric bus",
      "properties": {
        "id": "electric-bus",
        "name": "Electric bus",
        "abbr": "e-bus",
        "section": "topic-applications",
        "definition": "A battery-electric city or coach bus, with packs of 300–700 kWh on the roof and at the rear, LFP or NMC, charged overnight in the depot or at the terminus by pantograph. Its duty cycle — long hours, deep daily cycles, a twelve-year life — makes battery aging the central engineering question.",
        "related": [
          "depot-charging",
          "pantograph-charging",
          "vdv",
          "sort-cycle",
          "total-cost-of-ownership",
          "opportunity-charging"
        ],
        "url": "https://lemonergy.com/learn/glossary/electric-bus/",
        "mentions": [
          "kilowatt-hour"
        ]
      }
    },
    {
      "id": "term:j1939",
      "type": "Term",
      "label": "SAE J1939",
      "properties": {
        "id": "j1939",
        "name": "SAE J1939",
        "section": "topic-data",
        "definition": "The CAN-based protocol of trucks, buses and off-highway machines, with 29-bit identifiers and standard parameter groups. Commercial-vehicle batteries and chargers often report SOC, limits and faults as J1939 messages, and the bus FMS interface builds on it.",
        "related": [
          "can-bus",
          "fms-interface",
          "dbc",
          "electric-bus",
          "canopen"
        ],
        "url": "https://lemonergy.com/learn/glossary/j1939/",
        "mentions": [
          "state-of-charge"
        ]
      }
    },
    {
      "id": "term:differential-electrochemical-mass-spectrometry",
      "type": "Term",
      "label": "Differential electrochemical mass spectrometry",
      "properties": {
        "id": "differential-electrochemical-mass-spectrometry",
        "name": "Differential electrochemical mass spectrometry",
        "abbr": "DEMS",
        "aka": [
          "OEMS",
          "online electrochemical mass spectrometry"
        ],
        "section": "topic-analysis",
        "definition": "Feeding gas from an operating cell straight into a mass spectrometer, so each species is identified and quantified as it forms. It shows ethylene from ethylene carbonate reduction during formation, and the oxygen and carbon dioxide released by layered oxides at high state of charge, tying each gas to the voltage that made it.",
        "related": [
          "gas-generation",
          "off-gas",
          "electrolyte-decomposition",
          "formation",
          "operando-measurement",
          "gas-chromatography-mass-spectrometry"
        ],
        "url": "https://lemonergy.com/learn/glossary/differential-electrochemical-mass-spectrometry/",
        "mentions": [
          "state-of-charge",
          "reduction",
          "ec"
        ]
      }
    }
  ]
}