{
 "manufacturer": "Intesis (HMS Networks)",
 "manufacturer_slug": "intesis",
 "model": "INMBSDAI001I000 Daikin domestic AC to Modbus RTU gateway",
 "model_slug": "inmbsdai001i000",
 "short_model": "INMBSDAI001I000 Daikin",
 "aliases": [
  "INMBSDAI001I000",
  "Intesis Daikin domestic Modbus"
 ],
 "equipment_type": "VRF / split AC gateway",
 "applies_to": "Single Daikin domestic (S21-connector) indoor unit via INMBSDAI001I000, user manual v1.0.2.",
 "summary": "Small Modbus RTU server that plugs into the S21 connector of one Daikin domestic split indoor unit. Every point is a 16-bit holding register: on/off, mode, fan, vanes, setpoint, room temperature, alarm/error code, window contact and setpoint limits. Temperatures follow the scale chosen on DIP switch SW4.",
 "transport": [
  "RTU"
 ],
 "defaults": {
  "unit_id": 1,
  "baud": 9600,
  "parity": "None",
  "data_bits": 8,
  "stop_bits": 2,
  "tcp_port": null
 },
 "addressing": {
  "convention": "0-based",
  "note": "The tables print both a 'Modbus address (base 0)' and a 'PLC address (base 1)'. The base-0 column is used as the wire address and as 'documented'; the PLC address is one higher."
 },
 "default_word_order": null,
 "firmware": null,
 "source": {
  "title": "INMBSDAI001I000 Modbus RTU Gateway - Compatible with domestic air conditioning systems commercialized by Daikin - User Manual",
  "doc_number": "User Manual Version 1.0.2",
  "revision_date": "2024-11-18",
  "url": "https://www.hms-networks.com/docs/default-source/products/intesis/manuals-and-guides---manuals/user-manual-inmbsdai001i000.pdf",
  "pages": "printed pp. 14-21 (PDF pp. 17-24); error codes printed pp. 25-27"
 },
 "notes": [
  "Every register is documented as a 16-bit unsigned holding register and no temperature range in the manual goes below zero, so temperatures are UINT16. The 'no value' marker the manual writes as -32768 is raw 0x8000 (32768) and is listed as an enum entry.",
  "Temperature scale is set on DIP switch SW4: x1 °C (factory default), x10 °C or °F (no °F x10). The main register table refers to a 'SW2' that the gateway does not have; the DIP-switch section puts these options on SW4. Scale 1 / °C matches the factory default only; use 0.1 if x10 is selected.",
  "Fan speed (reg 2) and U/D vane (reg 3) enums are given differently in the two tables of the same manual (main table: fan 0 Auto, 1..6 Speed 1..6, 10 Fan stop; vane 0 Auto, 1..9 Position 1..9, 10 Swing. Table 7: fan 0 Auto, 1 Low, 2 Mid 1, 3 Mid 2, 4 Mid 3, 5 High; vane 0 Off, 10 Swing). Values left empty; confirm on the unit.",
  "Error code enum (around 100 Daikin codes keyed to remote-controller codes such as A0, U4) is not reproduced; see manual table 9.",
  "Humidification (reg 28) and 'Block periodic sendings' (reg 97) appear only in table 7 and not in the main table; left out because the two tables disagree elsewhere.",
  "Machine setpoint limit registers (1153-1156) are in °C or °F per DIP SW4; the manual does not say whether x10 applies to them.",
  "Register 7 is named 'Control objects disablement' in the main table and 'Gateway disablement' in Table 7; both describe 0 = enabled / 1 = disabled for control through the gateway, so it is kept."
 ],
 "registers": [
  {
   "table": "holding_register",
   "address": 0,
   "documented": "0",
   "name": "On/Off",
   "description": "Indoor unit run command and status.",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "",
   "access": "RW",
   "values": {
    "0": "Off",
    "1": "On"
   },
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 1,
   "documented": "1",
   "name": "Operation mode",
   "description": "Available modes depend on the indoor unit.",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "",
   "access": "RW",
   "values": {
    "0": "Auto",
    "1": "Heat",
    "2": "Dry",
    "3": "Fan",
    "4": "Cool"
   },
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 2,
   "documented": "2",
   "name": "Fan speed",
   "description": "Enum depends on unit; manual gives two different lists, see notes.",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "",
   "access": "RW",
   "values": null,
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 3,
   "documented": "3",
   "name": "Vane U/D position",
   "description": "Up/down louvre; manual gives two different lists, see notes.",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "",
   "access": "RW",
   "values": null,
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 4,
   "documented": "4",
   "name": "Temperature (user) setpoint",
   "description": "Modbus setpoint; range depends on model. SW4 x1 °C assumed (x10: 0.1, or °F).",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "°C",
   "access": "RW",
   "values": {
    "32768": "Not initialised / no value (0x8000; manual writes -32768)"
   },
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 5,
   "documented": "5",
   "name": "Indoor unit reference temperature",
   "description": "Ambient temperature the unit controls on. SW4 x1 °C assumed (x10: 0.1, or °F).",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "°C",
   "access": "R",
   "values": null,
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 6,
   "documented": "6",
   "name": "Window contact protocol input",
   "description": "Virtual window contact written from Modbus.",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "",
   "access": "RW",
   "values": {
    "0": "Closed",
    "1": "Open"
   },
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 7,
   "documented": "7",
   "name": "Control objects disablement",
   "description": "Blocks control through the gateway; Table 7 calls it 'Gateway disablement'. Stored in NVM.",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "",
   "access": "RW",
   "values": {
    "0": "Control objects enabled",
    "1": "Control objects disabled"
   },
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 8,
   "documented": "8",
   "name": "Remote control disablement",
   "description": "Blocks the unit's remote controller; stored in NVM.",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "",
   "access": "RW",
   "values": {
    "0": "RC enabled",
    "1": "RC disabled"
   },
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 9,
   "documented": "9",
   "name": "Operation time",
   "description": "Hours the unit has been on; stored in NVM.",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "h",
   "access": "RW",
   "values": null,
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 10,
   "documented": "10",
   "name": "Alarm status",
   "description": "",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "",
   "access": "R",
   "values": {
    "0": "No error present",
    "1": "Error present"
   },
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 11,
   "documented": "11",
   "name": "Error code",
   "description": "Daikin error number (manual table 9); 65535 = no comms with AC unit.",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "",
   "access": "R",
   "values": {
    "0": "No error present",
    "65535": "Communication error with AC unit"
   },
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 13,
   "documented": "13",
   "name": "Open window timeout",
   "description": "Minutes after window opens before the unit is switched off.",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "min",
   "access": "RW",
   "values": null,
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 14,
   "documented": "14",
   "name": "Baud rate",
   "description": "Baud rate currently selected on the DIP switches.",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "",
   "access": "R",
   "values": null,
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 15,
   "documented": "15",
   "name": "Modbus slave address",
   "description": "Range 1..63.",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "",
   "access": "R",
   "values": null,
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 21,
   "documented": "21",
   "name": "Max number of fan speeds",
   "description": "Configured number of fan speeds; Table 8 says it always reads 5.",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "",
   "access": "R",
   "values": null,
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 22,
   "documented": "22",
   "name": "Input sensor temperature",
   "description": "Room temperature written from Modbus (virtual temperature). SW4 x1 °C assumed (x10: 0.1, or °F).",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "°C",
   "access": "RW",
   "values": {
    "32768": "Not initialised / no value (0x8000; manual writes -32768)"
   },
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 23,
   "documented": "23",
   "name": "AC real setpoint",
   "description": "Setpoint actually sent to the indoor unit. SW4 x1 °C assumed (x10: 0.1, or °F).",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "°C",
   "access": "R",
   "values": null,
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 24,
   "documented": "24",
   "name": "Actual AC max setpoint",
   "description": "Upper setpoint limit reported by the unit. SW4 x1 °C assumed (x10: 0.1, or °F).",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "°C",
   "access": "R",
   "values": {
    "32768": "Not initialised / no value (0x8000; manual writes -32768)"
   },
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 25,
   "documented": "25",
   "name": "Actual AC min setpoint",
   "description": "Lower setpoint limit reported by the unit. SW4 x1 °C assumed (x10: 0.1, or °F).",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "°C",
   "access": "R",
   "values": {
    "32768": "Not initialised / no value (0x8000; manual writes -32768)"
   },
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 26,
   "documented": "26",
   "name": "Vane L/R position",
   "description": "Left/right louvre; positions depend on unit.",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "",
   "access": "RW",
   "values": {
    "0": "Auto",
    "1": "Pos 1",
    "2": "Pos 2",
    "3": "Pos 3",
    "4": "Pos 4",
    "5": "Pos 5",
    "10": "Swing"
   },
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 31,
   "documented": "31",
   "name": "Window contact functional status",
   "description": "",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "",
   "access": "R",
   "values": {
    "0": "Not active",
    "1": "Active (window open)"
   },
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 40,
   "documented": "40",
   "name": "Window contact On/Off disablement",
   "description": "",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "",
   "access": "R",
   "values": {
    "0": "Window contact not disabling On/Off",
    "1": "Window contact disabling On/Off"
   },
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 43,
   "documented": "43",
   "name": "Filter reset",
   "description": "Write 1 to reset the filter signal (RC-bus header only).",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "",
   "access": "W",
   "values": {
    "1": "Reset"
   },
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 44,
   "documented": "44",
   "name": "Filter status",
   "description": "",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "",
   "access": "R",
   "values": {
    "0": "Off - filter clean",
    "1": "Filter status alarm"
   },
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 48,
   "documented": "48",
   "name": "Switch value",
   "description": "Current DIP switch settings.",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "",
   "access": "R",
   "values": null,
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 65,
   "documented": "65",
   "name": "Input reference temperature (feedback)",
   "description": "Reference temperature feedback. SW4 x1 °C assumed (x10: 0.1, or °F).",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "°C",
   "access": "R",
   "values": null,
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 66,
   "documented": "66",
   "name": "Return path temperature",
   "description": "Indoor unit return-air temperature. SW4 x1 °C assumed (x10: 0.1, or °F).",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "°C",
   "access": "R",
   "values": null,
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 81,
   "documented": "81",
   "name": "Error address",
   "description": "Indoor unit address reporting the error (RC-bus header only).",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "",
   "access": "R",
   "values": null,
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 86,
   "documented": "86",
   "name": "Filter signal address",
   "description": "Indoor unit address reporting the filter signal (RC-bus header only).",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "",
   "access": "R",
   "values": null,
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 87,
   "documented": "87",
   "name": "Thermostat on",
   "description": "Whether the unit is actively working toward setpoint; not the On/Off state.",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "",
   "access": "R",
   "values": {
    "0": "Within setpoint",
    "1": "Working to reach setpoint"
   },
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 88,
   "documented": "88",
   "name": "Operation mode role",
   "description": "",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "",
   "access": "R",
   "values": {
    "1": "ROLE_MASTER",
    "2": "ROLE_SLAVE",
    "3": "ROLE_FREE (alone)"
   },
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 94,
   "documented": "94",
   "name": "FW version MSB",
   "description": "First two firmware digits in hex (1.2.3.4 shows as 1.2).",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "",
   "access": "R",
   "values": null,
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 95,
   "documented": "95",
   "name": "FW version LSB",
   "description": "Last two firmware digits in hex (1.2.3.4 shows as 3.4).",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "",
   "access": "R",
   "values": null,
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 98,
   "documented": "98",
   "name": "Master/Slave",
   "description": "",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "",
   "access": "R",
   "values": {
    "0": "Slave",
    "1": "Master"
   },
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 99,
   "documented": "99",
   "name": "Reset",
   "description": "Write 1 to restart the gateway.",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "",
   "access": "W",
   "values": {
    "1": "Reset"
   },
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 129,
   "documented": "129",
   "name": "Virtual temp active",
   "description": "Virtual temperature function in use.",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "",
   "access": "R",
   "values": {
    "0": "Not active",
    "1": "Active"
   },
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 130,
   "documented": "130",
   "name": "Window contact step",
   "description": "",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "",
   "access": "R",
   "values": {
    "0": "Idle (window closed)",
    "1": "Timeout1 (window open, timer running)",
    "2": "Timeout2 (not used for window contact)",
    "3": "Window contact action applied"
   },
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 1000,
   "documented": "1000",
   "name": "Window contact reload last value",
   "description": "",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "",
   "access": "RW",
   "values": {
    "0": "No",
    "1": "Yes"
   },
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 1001,
   "documented": "1001",
   "name": "Window contact lock when open",
   "description": "",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "",
   "access": "RW",
   "values": {
    "0": "No",
    "1": "Yes"
   },
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 1002,
   "documented": "1002",
   "name": "Window timeout",
   "description": "Range 0..30.",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "min",
   "access": "RW",
   "values": null,
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 1150,
   "documented": "1150",
   "name": "Machine mode",
   "description": "",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "",
   "access": "RW",
   "values": {
    "0": "Normal",
    "1": "Autochangeover",
    "2": "Limited setpoint"
   },
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 1153,
   "documented": "1153",
   "name": "Machine min setpoint cool",
   "description": "Default 24 °C / 75 °F. Printed as °C/°F only; manual silent on the x10 setting.",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "°C",
   "access": "RW",
   "values": null,
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 1154,
   "documented": "1154",
   "name": "Machine max setpoint cool",
   "description": "Default 28 °C / 82 °F. Printed as °C/°F only; manual silent on the x10 setting.",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "°C",
   "access": "RW",
   "values": null,
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 1155,
   "documented": "1155",
   "name": "Machine min setpoint heat",
   "description": "Default 19 °C / 66 °F. Printed as °C/°F only; manual silent on the x10 setting.",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "°C",
   "access": "RW",
   "values": null,
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 1156,
   "documented": "1156",
   "name": "Machine max setpoint heat",
   "description": "Default 23 °C / 73 °F; manual silent on x10 setting. PLC column misprinted 1167.",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "°C",
   "access": "RW",
   "values": null,
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 1220,
   "documented": "1220",
   "name": "Remote lock on NVM",
   "description": "Whether RC disablement (reg 8) survives a reset.",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "",
   "access": "RW",
   "values": {
    "0": "Remote lock disabled after reset",
    "1": "Keep value of RC disablement"
   },
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 1230,
   "documented": "1230",
   "name": "Initial wait as master",
   "description": "Startup delay (RC-bus header only).",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "s",
   "access": "RW",
   "values": null,
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 2000,
   "documented": "2000",
   "name": "Device identifier",
   "description": "Reads 2050.",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "",
   "access": "R",
   "values": null,
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 2005,
   "documented": "2005",
   "name": "L/R vanes map",
   "description": "Which left/right vane states the unit supports.",
   "data_type": "BITMAP16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "",
   "access": "R",
   "values": null,
   "bits": {
    "0": "Auto/Off enabled",
    "1": "Pos 1 enabled",
    "2": "Pos 2 enabled",
    "3": "Pos 3 enabled",
    "4": "Pos 4 enabled",
    "5": "Pos 5 enabled",
    "10": "Swing enabled",
    "15": "Map invalid (1) / valid (0)"
   },
   "offset": 0
  }
 ],
 "integration": {
  "summary": "Wire RS-485 A/B, set the slave address and baud on SW3/SW4, reboot, then poll holding registers 0-11 with function 03 and write single registers with function 06. Read register 11 for errors and keep reads to 50 registers or fewer per request.",
  "minimum_registers": [
   {
    "table": "holding_register",
    "address": 0,
    "why": "On/off"
   },
   {
    "table": "holding_register",
    "address": 1,
    "why": "Mode"
   },
   {
    "table": "holding_register",
    "address": 2,
    "why": "Fan speed"
   },
   {
    "table": "holding_register",
    "address": 4,
    "why": "Setpoint"
   },
   {
    "table": "holding_register",
    "address": 5,
    "why": "Room temperature"
   },
   {
    "table": "holding_register",
    "address": 10,
    "why": "Alarm flag"
   },
   {
    "table": "holding_register",
    "address": 11,
    "why": "Error code"
   }
  ],
  "enable": "No enable step. Set a non-zero slave address on SW3 (address 0 = not configured) and keep register 7 (control objects disablement) at 0 so Modbus commands reach the unit.",
  "watchdog": null,
  "quirks": [
   "Temperatures change scale with DIP SW4 (x1 °C, x10 °C or °F); confirm before scaling.",
   "Function 16 is accepted but only with a quantity of one register.",
   "Maximum 50 registers per read request.",
   "Line format 8-N-2 by default; the gateway auto-detects 8-N-1."
  ],
  "setup": [
   "Slave address on SW3 positions 1-6 (binary, 1..63; 0 = not configured, LED off).",
   "Baud on SW3 positions 7-8 plus SW4 position 3; 9600 bps default.",
   "120 Ω termination on SW4 position 4.",
   "DIP changes only take effect after a power cycle / reboot."
  ],
  "gotchas": [
   "Only one indoor unit per gateway (S21 connector).",
   "Writing the user setpoint does not guarantee the unit uses it: read 'AC real setpoint' (reg 23), which can differ when an external temperature is fed into reg 22 (virtual temperature function).",
   "Error code 65535 means the gateway has lost the AC unit, not an AC fault."
  ]
 },
 "page": "https://easymodbus.com/modbus-register-maps/intesis/inmbsdai001i000",
 "address_note": "address = 0-based Modbus wire (PDU) address; documented = as printed in the source.",
 "note": "Re-typed from the manufacturer's public documentation (see source) and verified against it. Registers vary by firmware and options; verify against the live device before writing."
}