{
  "$schema": "https://raw.githubusercontent.com/nobrega8/mbmap-library/main/schema/mbmap-2.schema.json",
  "mbmap": 2,
  "vendor": "LG",
  "model": "PMBUSB00A Modbus gateway (Therma V / Hydrokit)",
  "models": [
    "PMBUSB00A"
  ],
  "vendor_website": "lg.com",
  "description": "Modbus RTU gateway for LG air conditioners, ventilators and Therma V / Hydrokit heat pumps, indoor unit 0",
  "revision": 1,
  "revised": "2026-10-18",
  "source": "LG MODBUS RTU GATEWAY (PMBUSB00A) leaflet, Modbus gateway memory map, Hydrokit & THERMA V column",
  "sources": [
    {
      "title": "LG Modbus RTU Gateway PMBUSB00A, Gateway Specs",
      "url": "https://www.lg.com/gr/business/download/airsolution/Gateway_Specs[20210318_171618039].pdf",
      "note": "Memory map: coil, discrete, input and holding registers"
    }
  ],
  "notes": [
    "The gateway talks to up to 16 indoor units on one module (64 with 4 modules). The registers below are those of the indoor unit with central address N = 0: for another unit, coils and discrete inputs are at N x 16 plus the number listed, input and holding registers at N x 20 plus the number listed.",
    "The leaflet numbers the registers 1-based (0x01 coil 1, 10001 discrete 1, 30001 input 1, 40001 holding 1), so this map uses address_base 1.",
    "Only the Hydrokit and THERMA V column of the leaflet is mapped. For air conditioners and ventilators the same numbers mean other things (fan speed, swing, filter alarm, pipe temperatures, ventilation mode); see the leaflet.",
    "Temperatures are in 0.1 degree Celsius steps. Operate mode values: 0 cooling, 3 auto, 4 heating (1 dehumidifying and 2 fan exist only for air conditioners).",
    "Serial settings are fixed by the leaflet at 9600 bit/s, no parity, 1 stop bit; the Modbus slave address of the gateway is set on the gateway itself and is not given in the leaflet.",
    "Registers not listed in the leaflet column (reserved) are left out. Other Therma V generations and control boards may use different register addresses: check a read against the unit before writing."
  ],
  "protocol": "rtu",
  "unit_id": 1,
  "baudrate": 9600,
  "data_bits": 8,
  "parity": "N",
  "stop_bits": 1,
  "byte_order": "big",
  "address_base": 1,
  "x_status": "official",
  "enums": {
    "mode": {"0": "Cooling", "1": "Dehumidifying (air conditioner)", "2": "Fan (air conditioner)", "3": "Auto", "4": "Heating"}
  },
  "registers": [
    {"name": "Operate (on/off)", "group": "Indoor unit 0", "area": "coil", "address": 1, "type": "bool", "access": "RW", "description": "0 = stop, 1 = run"},
    {"name": "Hot water mode (on/off)", "group": "Indoor unit 0", "area": "coil", "address": 2, "type": "bool", "access": "RW", "description": "0 = disable, 1 = enable"},
    {"name": "Lock remote controller", "group": "Indoor unit 0", "area": "coil", "address": 4, "type": "bool", "access": "RW", "description": "0 = unlock, 1 = lock"},
    {"name": "Connected IDU", "group": "Indoor unit 0", "area": "discrete", "address": 1, "type": "bool", "access": "R", "description": "0 = disconnected, 1 = connected"},
    {"name": "Alarm", "group": "Indoor unit 0", "area": "discrete", "address": 2, "type": "bool", "access": "R", "description": "0 = normal, 1 = alarm"},
    {"name": "Hot water only", "group": "Indoor unit 0", "area": "discrete", "address": 3, "type": "bool", "access": "R", "description": "Hydrokit only: 0 = normal, 1 = hot water only"},
    {"name": "Target temperature select", "group": "Indoor unit 0", "area": "discrete", "address": 4, "type": "bool", "access": "R", "description": "0 = air, 1 = water"},
    {"name": "Error division", "group": "Indoor unit 0", "area": "discrete", "address": 5, "type": "bool", "access": "R", "description": "Hydrokit only: 0 = CH type error, 1 = BC type error"},
    {"name": "Error code", "group": "Indoor unit 0", "area": "input", "address": 1, "type": "uint16", "access": "R", "description": "0 to 255; see the error table of the product"},
    {"name": "Room temperature", "group": "Indoor unit 0", "area": "input", "address": 2, "type": "int16", "access": "R", "scale": 0.1, "unit": "°C"},
    {"name": "Water inlet temperature", "group": "Indoor unit 0", "area": "input", "address": 3, "type": "int16", "access": "R", "scale": 0.1, "unit": "°C"},
    {"name": "Water outlet temperature", "group": "Indoor unit 0", "area": "input", "address": 4, "type": "int16", "access": "R", "scale": 0.1, "unit": "°C"},
    {"name": "Sanitary tank temperature", "group": "Indoor unit 0", "area": "input", "address": 5, "type": "int16", "access": "R", "scale": 0.1, "unit": "°C"},
    {"name": "Solar temperature", "group": "Indoor unit 0", "area": "input", "address": 6, "type": "int16", "access": "R", "scale": 0.1, "unit": "°C", "description": "AWHP only"},
    {"name": "Operate mode", "group": "Indoor unit 0", "area": "holding", "address": 1, "type": "uint16", "access": "RW", "enum": "mode", "description": "Hydrokit with middle-temperature DHW and AWHP: 0, 3 or 4; Hydrokit with high-temperature DHW: 3 or 4"},
    {"name": "Target temperature DHW", "group": "Indoor unit 0", "area": "holding", "address": 2, "type": "uint16", "access": "RW", "scale": 0.1, "unit": "°C", "description": "0 to 127 °C, limited by the upper and lower limits set on the remote controller"},
    {"name": "Target temperature", "group": "Indoor unit 0", "area": "holding", "address": 3, "type": "uint16", "access": "RW", "scale": 0.1, "unit": "°C", "description": "0 to 127 °C, limited by the upper and lower limits set on the remote controller"}
  ]
}