{
 "manufacturer": "Intesis (HMS Networks)",
 "manufacturer_slug": "intesis",
 "model": "INMBSHIT001R000 Hitachi AC to Modbus RTU gateway",
 "model_slug": "inmbshit001r000",
 "short_model": "INMBSHIT001R000",
 "aliases": [
  "INMBSHIT001R000",
  "Hitachi Modbus gateway",
  "Intesis Hitachi"
 ],
 "equipment_type": "VRF / split AC gateway",
 "applies_to": "Intesis (HMS Networks) INMBSHIT001R000 interface on the AB bus of one Hitachi commercial-line indoor unit (or group), per user manual v1.6 (01/2024).",
 "summary": "One Intesis interface per Hitachi indoor unit (or remote-controller group), wired to the unit's AB bus and presented to the BMS as a Modbus RTU slave. Every point is a single 16-bit holding register: on/off, mode, fan speed, vane position, setpoint and room temperature, alarm and error code, window-contact logic, remote-control lockout and a virtual-temperature input for a BMS room sensor.",
 "transport": [
  "RTU"
 ],
 "defaults": {
  "unit_id": 1,
  "baud": 9600,
  "parity": "None",
  "data_bits": 8,
  "stop_bits": 2,
  "tcp_port": null
 },
 "addressing": {
  "convention": "0-based",
  "note": "Each register is listed with a 'protocol address' and a 'PLC address' one higher. This map uses the protocol address as the wire address: on/off is 0 (PLC 1), setpoint 4 (PLC 5)."
 },
 "default_word_order": null,
 "firmware": null,
 "source": {
  "title": "Intesis INMBSHIT001R000 User's Manual - Modbus RTU (EIA-485) Interface for Hitachi air conditioners",
  "doc_number": "User's Manual v1.6 EN",
  "revision_date": "2024-01",
  "url": "https://www.hms-networks.com/docs/default-source/products/intesis/manuals-and-guides---manuals/user-manual-inmbshit001r000.pdf",
  "pages": "pp. 6-7 (connection, quick start), p. 8 (physical layer), pp. 8-10 (registers), pp. 11-12 (temperature registers), pp. 13-14 (DIP switches)"
 },
 "notes": [
  "The manual says every register is a 16-bit unsigned holding register; the 'not initialised' marker it prints as -32768 is raw 0x8000 (32768).",
  "Temperature format is set on DIP switch SW4: P1 picks whole degrees (x1) or tenths (x10), P2 picks °C or °F; Fahrenheit is never x10. The manual contradicts itself on the factory setting: the SW4 table marks x1 as default, while a register-table footnote says x10 °C is the default. The scale of 1 shown on the temperature registers is a placeholder for the x1 setting, not a confirmed default: check SW4 P1 on site (or compare a known temperature) and use 0.1 if P1 is set to x10.",
  "The baud-rate register (14) lists the possible rates but not the number that stands for each, so no value list is given.",
  "Mode, fan speed and vane values available depend on the indoor unit model.",
  "Error codes other than 0 and 65535 are listed in section 7 of the manual."
 ],
 "registers": [
  {
   "table": "holding_register",
   "address": 0,
   "documented": "0",
   "name": "AC unit on/off",
   "description": "",
   "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": "AC unit mode",
   "description": "Available values 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": "AC unit fan speed",
   "description": "Available values depend on the indoor unit.",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "",
   "access": "RW",
   "values": {
    "0": "Auto",
    "1": "Low",
    "2": "Mid",
    "3": "High",
    "4": "Super-high"
   },
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 3,
   "documented": "3",
   "name": "AC unit vane position",
   "description": "Available values depend on the indoor unit.",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "",
   "access": "RW",
   "values": {
    "1": "POS1 (horizontal)",
    "2": "POS2 (horizontal)",
    "3": "POS3 (middle)",
    "4": "POS4 (vertical)",
    "5": "POS5 (vertical)",
    "6": "POS6",
    "7": "POS7",
    "10": "Swing"
   },
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 4,
   "documented": "4",
   "name": "AC unit temperature setpoint",
   "description": "Requested setpoint, 16-32 °C. Scale per SW4 P1; factory setting unclear.",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "°C",
   "access": "RW",
   "values": {
    "32768": "Not initialised (0x8000, printed as -32768)"
   },
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 5,
   "documented": "5",
   "name": "AC unit temperature reference",
   "description": "Temperature the indoor unit controls to. Scale per SW4 P1; factory setting unclear.",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "°C",
   "access": "R",
   "values": {
    "32768": "Not initialised (0x8000, printed as -32768)"
   },
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 6,
   "documented": "6",
   "name": "Window contact",
   "description": "Open starts the switch-off countdown (register 13).",
   "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": "Gateway disablement",
   "description": "1 stops the gateway sending commands to the unit; stored.",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "",
   "access": "RW",
   "values": {
    "0": "Gateway enabled",
    "1": "Gateway disabled"
   },
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 8,
   "documented": "8",
   "name": "AC remote control disablement",
   "description": "1 locks out the wired remote; stored.",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "",
   "access": "RW",
   "values": {
    "0": "Remote control enabled",
    "1": "Remote control disabled"
   },
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 9,
   "documented": "9",
   "name": "AC unit operation time",
   "description": "Hours the unit has been on; stored.",
   "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": "AC unit alarm status",
   "description": "",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "",
   "access": "R",
   "values": {
    "0": "No alarm",
    "1": "Alarm"
   },
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 11,
   "documented": "11",
   "name": "Error code",
   "description": "0 = none; 65535 = gateway or remote cannot reach the unit.",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "",
   "access": "R",
   "values": {
    "0": "No error",
    "65535": "Communication error with the AC unit"
   },
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 13,
   "documented": "13",
   "name": "Open window switch-off timeout",
   "description": "0-30 min, factory 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": 14,
   "documented": "14",
   "name": "Modbus RTU baud rate",
   "description": "Read-only; set on SW3/SW4.",
   "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": "1-63; set on SW3.",
   "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": "",
   "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": "External ambient temperature (Modbus)",
   "description": "BMS room temperature; writing it enables virtual temperature. Scale per SW4 P1; factory setting unclear.",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "°C",
   "access": "RW",
   "values": {
    "32768": "Not initialised (0x8000, printed as -32768)"
   },
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 23,
   "documented": "23",
   "name": "AC real temperature setpoint",
   "description": "Setpoint actually sent to the unit. Scale per SW4 P1; factory setting unclear.",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "°C",
   "access": "R",
   "values": {
    "32768": "Not initialised (0x8000, printed as -32768)"
   },
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 24,
   "documented": "24",
   "name": "Current AC max setpoint",
   "description": "Scale per SW4 P1; factory setting unclear.",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "°C",
   "access": "R",
   "values": {
    "32768": "Not initialised (0x8000, printed as -32768)"
   },
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 25,
   "documented": "25",
   "name": "Current AC min setpoint",
   "description": "Scale per SW4 P1; factory setting unclear.",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "°C",
   "access": "R",
   "values": {
    "32768": "Not initialised (0x8000, printed as -32768)"
   },
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 31,
   "documented": "31",
   "name": "Window contact status (feedback)",
   "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": 34,
   "documented": "34",
   "name": "Left/right vane pulse",
   "description": "Write 1 to step the side vane.",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "",
   "access": "W",
   "values": {
    "1": "Pulse"
   },
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 45,
   "documented": "45",
   "name": "Error reset",
   "description": "Write 1 to reset the error.",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "",
   "access": "W",
   "values": {
    "1": "Reset"
   },
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 48,
   "documented": "48",
   "name": "Switch value",
   "description": "DIP switch positions.",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "",
   "access": "R",
   "values": null,
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 49,
   "documented": "49",
   "name": "Device ID",
   "description": "Reads 0x1400.",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "",
   "access": "R",
   "values": {
    "5120": "INMBSHIT001R000 (0x1400)"
   },
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 50,
   "documented": "50",
   "name": "Software version",
   "description": "",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "",
   "access": "R",
   "values": null,
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 66,
   "documented": "66",
   "name": "Return path temperature",
   "description": "Return-air sensor of the indoor unit. Scale per SW4 P1; factory setting unclear.",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "°C",
   "access": "R",
   "values": {
    "32768": "Not initialised (0x8000, printed as -32768)"
   },
   "bits": null,
   "offset": 0
  },
  {
   "table": "holding_register",
   "address": 81,
   "documented": "81",
   "name": "Error address",
   "description": "Indoor unit number reporting the error.",
   "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 (gateway)",
   "description": "Gateway role on the Hitachi AB bus.",
   "data_type": "UINT16",
   "length": 1,
   "word_order": null,
   "scale": 1,
   "units": "",
   "access": "RW",
   "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
  }
 ],
 "integration": {
  "summary": "Wire the AB bus to the indoor unit (or in parallel with the Hitachi wired remote) and A+/B- to the Modbus master, set the address on SW3, then read holding registers 0-25 with function 03 and write commands one register at a time with function 06.",
  "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"
   },
   {
    "table": "holding_register",
    "address": 7,
    "why": "Gateway disablement (keep 0)"
   }
  ],
  "enable": "No enable step; keep register 7 (gateway disablement) at 0. Set SW1 P1 to Slave when a Hitachi wired remote is the AB-bus master (default), or Master when there is no remote.",
  "watchdog": null,
  "quirks": [
   "Function 16 is accepted only with a quantity of one register.",
   "Factory serial setting is 9600 baud, 8-N-2; 8-N-1 is detected automatically.",
   "Temperature format follows DIP SW4 (x1 / x10, °C / °F)."
  ],
  "setup": [
   "SW3 P1-P6: slave address (default 1); SW3 P7-P8 with SW4 P3: baud rate (default 9600).",
   "SW4 P1: x1 / x10; SW4 P2: °C / °F; SW4 P4: 120 ohm termination.",
   "SW1 P1: gateway Slave (with Hitachi remote as master, default) or Master (no remote).",
   "DIP changes need a power cycle; the interface must be connected to a powered indoor unit to communicate."
  ],
  "gotchas": [
   "If several indoor units share one AB bus, a Hitachi wired remote set as master is required.",
   "Writing a room temperature to register 22 turns on virtual temperature: the setpoint sent to the unit (register 23) then differs from register 4 and from what the Hitachi remote shows.",
   "AB bus maximum length is 500 m."
  ]
 },
 "page": "https://easymodbus.com/modbus-register-maps/intesis/inmbshit001r000",
 "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."
}